UDC 669.14-413:669.586.5:006.354 Group B23

STATE STANDARD OF THE UNION OF THE SSR

ZINC-PLATED STEEL WITH CONTINUOUS LINES

TECHNICAL CONDITIONS

GOST 14918-80

STATE COMMITTEE ON STANDARDS

DEVELOPED by the Ministry of Ferrous Metallurgy of the USSR

PERFORMERS:

V. I. Dovgopol, B. N. Papulov, V. M. Kukushkin, A. A. Tarasova

INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR

Member of the Board V. V. Lemnitsky

APPROVED AND INTRODUCED BY Decree State Committee USSR according to the standards of March 31, 1980 No. 1465

Reissue (October 1987) with amendments No. 1, 2, approved in September 1981, June 1986 (IUS 11-81, 9-86)

STATE STANDARD OF THE UNION OF THE USSR

ZINCED THIN STEEL GOST

WITH CONTINUOUS LINES 14918-80

Specifications

Continuously galvanized sheet steel Instead

technical conditions GOST 14918-69

By the Decree of the USSR State Committee for Standards dated March 31, 1980 No. 1465, the validity period was established from 01.07.1981

until 01.07.1986

Non-compliance with the standard is punishable by law

This standard applies to sheet and coil cold-rolled steel, hot-dipped galvanized in continuous galvanizing units, intended for cold profiling, for painting, for the manufacture of stamped parts, utensils, containers and other metal products.

1. CLASSIFICATION

1.1. Sheet steel galvanized (OTs) is subdivided:

assigned to groups

for cold stamping - X W,

for cold profiling - X P,

for coloring - PC,

general purpose- IS HE;

according to the ability to draw (steel of the XSh group) into categories

normal hood - H,

deep drawing - G,

very deep drawing - VG;

according to the uniformity of the thickness of the zinc coating

with normal thickness variation - HP,

with reduced thickness variation - UR.

1.2. By agreement between the consumer and the manufacturer, galvanized steel can be produced:

with crystallization pattern - KR,

without crystallization pattern - MT.

1.3. Depending on the thickness of the coating, galvanized steel is divided into 3 classes in accordance with the table. one.

Table 1

In the manufacture of steel with a differentiated coating, its thickness on one side of the sheet must correspond to class 2, and on the other side - class P (for sheets) or class 1.

2. ASSORTMENT

2.1. Galvanized steel is produced with a width of 710 to 1500 mm inclusive, a thickness of 0.5 to 3.0 mm inclusive.

2.2. Dimensions, limit deviations and other requirements for the assortment must comply with the requirements of GOST 19904-74.

Galvanized steel, which has been duly awarded the State Quality Mark, is manufactured by:

with a crescent of rolled steel no more than 6 mm per 3 m of length;

with flatness PV and PU and permissible deviations of thickness according to the norms of increased rolling accuracy;

with telescopic rolls with steel width up to 1000 mm no more than 30 mm.

Examples symbols

Galvanized steel with a thickness of 0.8, a width of 1000, a length of 2000 mm, normal rolling accuracy B, normal flatness PN, with an unedged edge NO of the OH group, with a crystallization pattern of KR, the first class of zinc coating according to GOST 14918-80:

Galvanized rolled steel with a thickness of 1.2, a width of 1000 mm, increased rolling accuracy A, with a cut edge O, grade 08kp, very deep drawing VG, without a crystallization pattern MT, with a reduced thickness variation UR, the second class of coating according to GOST 14918-80:

Galvanized rolled steel with a differentiated coating 0.5 thick, 710 mm wide, increased rolling accuracy A, high planar PV, with cut edge O, grade Bst3kp, for PC painting, without crystallization pattern MT with reduced thickness variation UR, coated on one side first, and on the other second class according to GOST 14918-80:

3. TECHNICAL REQUIREMENTS

3.1. Galvanized steel shall be manufactured in accordance with the requirements of this International Standard. technical documentation approved in the prescribed manner.

3.2. Galvanized steel is made from cold rolled carbon steel with surface quality according to GOST 16523-70. Steel grades must correspond to those given in table. 1a.

Table 1a

3.3. For galvanizing, zinc grades Ts0 and Ts1 are used according to GOST 3640-79 with the addition of aluminum, lead and other metals to the bath. Doping with lead is allowed due to the introduction of zinc grade Ts2.

3.4. The surface of galvanized steel must be clean and fully coated.

3.4.1. Disruption of the continuity of the coating in the form of cracking on small sags located on defects in the steel base, the classification and dimensions of which are provided for by GOST 16523-70, is not allowed.

3.4.2. On sheets and strips with an unedged edge, edge flaws with a depth exceeding the maximum deviations in width are not allowed.

3.5. For galvanized steel of groups KhSh and KhP, small sagging (sagging, stratification), grains and uneven crystallization of zinc, traces of kinks in the strip and control rollers, local roughness of the coating (rash), light scratches and abrasions that do not violate the continuity of the zinc coating, light and dull spots, uneven coloration of the passive film.

3.6. For galvanized steel of the PC group, dark dots and a path (traces) from deformed small sagging (sagging, layering), grains and local roughness of the coating (rash), matte and blurred pattern of zinc crystallization, traces of strip kinks, light scratches and abrasions, are allowed. disrupting the continuity of the zinc coating, light and matte spots, uneven coloring of the passive film.

3.7. At the customer's request, the passive film must have a uniform color.

3.8. The reduced variation in thickness of the zinc coating UR should be no more than 16 for class P, no more than 10 for class 1, and no more than 4 microns for class 2. Galvanized steel of normal thickness variation HP should have a coating thickness within the limits specified in Table 1.

Galvanized steel the highest category quality is made with different thicknesses of zinc coating for steel groups KhSh, KhP and PK class P - no more than 12, class 1 - no more than 8 and class 2 - no more than 3 microns.

3.9. In the place of bending of galvanized steel with a thickness of up to 1.0 mm inclusive, when testing for the strength of adhesion of the coating to the base metal at a bend of 180 °, there should be no delamination of the zinc coating exposing the steel surface. A network of small cracks is allowed along the entire length of the bend and delamination of the coating at a distance of up to 6 mm from the edges of the sample.

3.10. Mechanical galvanized steel must comply with the standards specified in Table. 1b.

the depth of the spherical hole of galvanized steel of the XSh group must comply with the standards given in table. 1b.

For galvanized steel of the XSh group of the highest quality category, the relative elongation should be 1 unit. more than the norms of the table. 1b, and the depth of the spherical hole is 0.2 mm more than the norms of Table. 1c.

Table 1 b

Note. The values ​​of tensile strength and relative elongation for galvanized steel of the XSh group of drawing categories N and G of relative elongation for steel of the HP and PK groups are optional until 07/01/89.

When calculating the tensile strength and yield strength, the thickness of the zinc coating is not taken into account.

Table 1c

Notes:

For galvanized steel of intermediate thicknesses, the depth of the spherical hole must comply with the standards established for the nearest smaller thickness.

Spherical dimple depth values ​​for galvanized steel over 1.5 mm thick are optional until 07/01/89.

When tested on devices of the MTL-10 g type, the norms for the depth of a spherical hole are reduced by 0.3 mm.

3.11. Galvanized steel of the XSh group is made with a ferrite grain size of points 7, 8, 9, 10 according to GOST 5639-82 for VG hood categories and not less than 6 points for G hood categories.

For galvanized steel of category VG, uneven grain is allowed within two adjacent numbers, for sheets of category G - within three adjacent numbers.

3.12. For galvanized steel of group ХШ of category VG, the presence of structurally free cementite is allowed within the limits of points 0, 1, 2 and 3 of scale 1 according to GOST 5640-68. For drawing categories G and H, the presence of structurally free cementite is not standardized.

The number of bends without fracture of galvanized steel of the groups KhP, PK, OH must comply with the standards established in Table. 1g

Table 1d

Note. The bending standards for galvanized steel with a thickness of more than 1.5 mm are optional until 07/01/89.

3.14. (Deleted, Rev. No. 2).

4. ACCEPTANCE RULES

4.1. Galvanized steel is accepted in batches. The batch should consist of sheets or coils of one group of galvanized steel of the same size, one type and class of coating thickness, type of conservation, one brand and melt (steel of the KhSh, KhP and PK groups) and drawing category (steel of the KhSh group), must be issued and accompanied by a quality document in accordance with GOST 7566-81 with the addition of the values ​​of optional quality indicators.

The mass of the batch should not exceed the replacement production of the unit.

4.2. In the quality document, test results and data chemical composition specified at the request of the consumer.

For galvanized steel, which in accordance with the established procedure has been awarded the State Quality Mark, the designation of the State Quality Mark is affixed to the quality document.

4.3. To control the dimensions and quality of the surface, 6% of the sheets or one roll from the batch are selected.

4.4. To control the adhesion strength of the coating, the mechanical properties of the microstructure, one sheet or one roll from the batch is selected.

4.5. Upon receipt of unsatisfactory test results for at least one of the indicators, a re-test is carried out in accordance with GOST 7566-81.

5. TEST METHODS

5.1. The quality of the surface of sheets and rolls is checked by external inspection without the use of magnifying devices.

5.2. For testing, samples are cut from each selected sheet or roll in accordance with the requirements of the drawing and table. 2.

Scheme of cutting samples for testing

(b- sheet width)

table 2

Note. Samples are cut out with maximum deviations in size - 3 mm.

5.3. To determine the mass of the zinc coating, the test sample is degreased, weighed, immersed in a solution of antimony oxide (Sb 2 O 3) or antimony chloride (SbCl 3) in hydrochloric acid and kept until violent gas evolution stops, then the sample is removed from the solution, thoroughly washed with cold, and then with hot water, dry with filter paper and weigh. Degreasing is carried out with technical synthetic ethyl alcohol.

A solution of antimony oxide or antimony chloride is prepared as follows: 20 g of antimony oxide (or 32 g of antimony chloride) is dissolved in 1000 ml of concentrated of hydrochloric acid(GOST 3118-77) for the second and first classes or 50 g of antimony for class P.

The mass of zinc coating applied on both sides of the sheet, in grams ( t) per 1 m 2 is calculated by the formula

where t 1 - the mass of three samples (3, 4 and 5) before the dissolution of the zinc coating, with an error of 0.01 g, g;

t 2 - mass of three samples (3, 4 and 5) after the dissolution of the zinc coating, with an error of 0.01 g, g;

S- the actual surface area of ​​the samples with an error of 1.10 -6 m 2 , m 2 .

To determine the weight of the zinc coating, it is allowed to use other methods that provide the necessary accuracy.

The method specified in this standard is applied in case of disagreement in the assessment.

5.4. The variation in thickness of the coating in the transverse direction of the sheet is determined as the absolute difference between the maximum and minimum values ​​of the coating thickness on samples 3, 4 and 5 according to the formula

for which, first, the thickness of the zinc coating is calculated on each of the samples according to the formula

where T 3 - coating thickness of the corresponding sample, microns;

t 3 - mass of the sample before removal of zinc, g;

t 3 / - mass of the sample after removal of zinc, g;

7.13 - density of zinc, g/cm 3 ;

S 2 - sample surface area, cm 2

5.4.1. The average value of the thickness and thickness variation of the zinc coating of the surface of the sheet with a differentiated coating is determined and calculated for each side. To do this, after degreasing the sample, one of the sides is covered with a dense layer of rubber glue or paraffin and zinc is removed from the opposite side, as indicated above. After re-weighing, the glue or paraffin is removed mechanically or in hot water. The removal of the zinc coating from the other side of the sample is carried out in the same way.

5.5. The bend test is carried out according to GOST 13813-68.

5.6. The test for drawing a spherical hole is carried out according to GOST 10510-77. Make two measurements in the test area and determine the arithmetic mean.

5.7. The tensile test is carried out according to GOST 11701-84.

5.8. Determination of the grain size of ferrite is carried out according to GOST 5639-82 and structure-free cementite - according to GOST 5640-68.

5.9. The bending test of galvanized steel up to 1 mm thick inclusive at an angle of 180 ° is carried out in accordance with GOST 14019-80. A sample of galvanized steel is tested on a mandrel equal to the thickness of the rolled product.

Galvanized steel of the highest category must withstand a 180° bending test without a mandrel until the sides meet.

By agreement between the consumer and the manufacturer, the bending test can be replaced by a test for a double roof lock in accordance with GOST 13814-68, and for galvanized steel of the PK group, with a test on the U-1A device in accordance with GOST 4765-73.

Galvanized steel with a thickness of more than 1.0 mm is tested at the request of the consumer according to the procedure agreed upon in the prescribed manner.

5.10. To control the quality of galvanized steel, it is allowed to use non-destructive control methods.

6. PACKAGING, LABELING, TRANSPORT AND STORAGE

INTERSTATE STANDARD

ZINC-PLATED STEEL
WITH CONTINUOUS LINES

TECHNICAL CONDITIONS

Moscow

Standartinform

INTERSTATE STANDARD

Edition (August 2007) with Amendments No. 1, 2, approved in September 1981, June 1986 (IUS 11-81, 9-86).

Decree of the USSR State Committee for Standards dated March 31, 1980 No. 1465 introduction date set

01.07.81

The validity period was removed according to protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

This standard applies to sheet and coil cold-rolled steel, hot-dipped galvanized in continuous galvanizing units, intended for cold profiling, for painting, for the manufacture of stamped parts, utensils, containers and other metal products.

The technical level indicators established by this standard meet the requirements of the highest and first category of quality.

1. CLASSIFICATION

1.1. Sheet steel galvanized (OTs) is subdivided:

assigned to groups

for cold stamping - ХШ,

for cold profiling - HP,

for coloring (trained) - PC,

general purpose - OH;

by pulling ability
(steel group XSh) per category

normal hood - H,

deep drawing - G,

very deep drawing - VG;

according to the uniformity of the thickness of the zinc coating

with normal thickness variation - HP,

with reduced thickness variation - UR.

1.2. By agreement between the consumer and the manufacturer, galvanized steel can be produced:

with crystallization pattern - KR,

without crystallization pattern - MT.

1.3. Depending on the thickness of the coating, galvanized steel is divided into three classes in accordance with those indicated in Table. one.

Table 1

In the manufacture of steel with a differentiated coating, its thickness on one side of the sheet must correspond to class 2, and on the other side to class P (for sheets) or class 1.

(Revised edition, Rev. No. 2).

2. ASSORTMENT

2.1. Galvanized steel is produced with a width of 710 to 1800 mm inclusive, a thickness of 0.5 to 2.5 mm inclusive.

2.2. Dimensions, maximum deviations and other requirements for the assortment must comply with the requirements of GOST 19904-90.

Galvanized steel of the highest quality category is produced by:

with a crescent of rolled steel no more than 6 mm per 3 m of length;

with flatness PV and PU and permissible deviations of thickness according to the standards of increased rolling accuracy;

with telescopic rolls with steel width up to 1000 mm no more than 30 mm.

Legend Examples

Galvanized steel with a thickness of 0.8, a width of 1000, a length of 2000 mm, normal rolling accuracy B, normal flatness PN, with an uncut edge of the NO group OH, with a crystallization pattern of KR, the first class of zinc coating according to GOST 14918-80:

Galvanized rolled steel with a thickness of 1.2, a width of 1000 mm, increased rolling accuracy A, with a cut edge O, grade 08kp, very deep drawing VG, without a crystallization pattern MT, with reduced thickness variation UR, the second class of coating according to GOST 14918-80:

Galvanized rolled steel with a differentiated coating 0.5 thick, 710 mm wide, increased rolling accuracy A, with cut edge O, grade Bst3kp, for PC painting, without crystallization pattern MT with reduced thickness variation UR, coated on one side of the first, and on another second class according to GOST 14918-80:

Chapter. 2. (Revised edition, Rev. No. 2).

3. TECHNICAL REQUIREMENTS

3.1. Galvanized steel must be manufactured in accordance with the requirements of this standard for technical documentation approved in the prescribed manner.

3.2. Galvanized steel is made from carbon cold-rolled coiled steel with surface quality in accordance with GOST 16523-97. Steel grades must correspond to those given in table. 1a.

Table 1a

(Changed edition, Rev. No. 2).

3.3. For galvanizing, zinc grades Ts0 and Ts1 are used according to GOST 3640-94 with the addition of aluminum, lead and other metals to the bath. Doping with lead is allowed due to the introduction of zinc grade Ts2.

3.4. The surface of galvanized steel must be clean and completely coated.

3.4.1. Disruption of the continuity of the coating in the form of cracking on small nodules located on defects in the steel base is not allowed, the classification and dimensions of which are provided for by GOST 16523-97.

3.4.2. On sheets and strips with an unedged edge, edge flaws with a depth exceeding the maximum deviations in width are not allowed.

3.4-3.4.2. (Changed edition, Rev. No. 2).

3.5. For galvanized steel of groups KhSh, KhP and OH, small sagging (sagging, stratification), grains and uneven crystallization of zinc, traces of bending of the strip and control rollers, local roughness of the coating (rash), light scratches and abrasions that do not violate the continuity of the zinc coating are allowed, light and matte spots, uneven coloring of the passive film.

3.6. For galvanized steel of the PC group, dark dots and a path (traces) from deformed small sagging (sagging, layering), grains and local roughness of the coating (rash), matte and blurred pattern of zinc crystallization, traces of strip kinks, light scratches and abrasions, are allowed. disrupting the continuity of the zinc coating, light and matte spots, uneven coloring of the passive film.

3.7. At the request of the consumer, the passive film must have a uniform color.

(Changed edition, Rev. No. 2).

3.8. The reduced variation in thickness of the zinc coating UR should be no more than 16 for class P, no more than 10 for class 1, and no more than 4 microns for class 2. Galvanized steel of normal thickness HP must have a coating thickness within the limits indicated in Table. one.

Galvanized steel of the highest quality category is produced with different thicknesses of the zinc coating for steel of the XSh, KhP and PK groups of class P - no more than 12, class 1 - no more than 8 and class 2 - no more than 3 microns.

(Changed edition, Rev. No. 1, 2).

3.9. In the place of bending of galvanized steel with a thickness of up to 1.0 mm inclusive, when testing for the strength of adhesion of the coating to the base metal at a bend of 180 °, there should be no delamination of the zinc coating exposing the steel surface. A network of small cracks is allowed along the entire length of the bend and delamination of the coating at a distance of up to 6 mm from the edges of the sample.

3.10. The mechanical properties of galvanized steel must comply with the standards specified in Table. 1b.

Table 1b

Note. The values ​​of time comparison to rupture and relative elongation for galvanized steel of the XSh group of drawing categories N and G, relative elongation for steel of the HP and PK groups were optional until 01.07.89.

When calculating the time comparison and yield strength, the thickness of the zinc coating is not taken into account.

3.10.1. The depth of the spherical hole of galvanized steel of the XSh group must comply with the standards given in Table. 1c.

Table 1c

Notes:

1. For galvanized steel of intermediate thicknesses, the depth of the spherical hole must comply with the standards established for the nearest smaller thickness.

2. The values ​​of the depth of the spherical hole for galvanized steel with a thickness of more than 1.5 mm were optional until 07/01/89.

3. When tested on devices of the MTL-10 g type, the norms for the depth of a spherical hole are reduced by 0.3 mm.

3.10.2. For galvanized steel of the XSh group of the highest quality category, the relative elongation should be 1 unit. more than the norms of the table. 1b, and the depth of the spherical hole is 0.2 mm more than the norms of Table. 1c.

3.10-3.10.2. (Revised edition, Rev. No. 2).

3.11. Galvanized steel of the XSh group is made with a ferrite grain size of points 7, 8, 9, 10 according to GOST 5639-82 for VG hood categories and not less than 6 points for G hood category.

For galvanized steel of category VG, uneven grain is allowed within two adjacent numbers, for sheets of category G - within three adjacent numbers.

3.12. For galvanized steel of group ХШ of category VG, the presence of structurally free cementite is allowed within the limits of points 0, 1, 2 and 4 of scale 1 according to GOST 5640-68. For drawing categories G and H, the presence of structurally free cementite is not standardized.

3.13. The number of bends without fracture of galvanized steel of the groups KhP, PK, OH must comply with the standards established in Table. 1g

Table 1d

Note. The norms of bending of galvanized steel with a thickness of more than 1.5 mm were optional until 07/01/89.

(Revised edition, Rev. No. 2).

3.14. (Deleted, Rev. No. 2).

4. ACCEPTANCE RULES

4.1. Galvanized steel is accepted in batches. The batch must consist of sheets or coils of the same group of galvanized steel, of the same size, of the same type and class of coating thickness, type of conservation, of the same grade and heat (steel of the KhSh, KhP and PK groups) and drawing category (steel of the KhSh group), must be issued and be accompanied by a quality document in accordance with GOST 7566-94 with the addition of the values ​​of optional quality indicators.

The mass of the batch should not exceed the replacement production of the unit.

(Revised edition, Rev. No. 2).

4.2. In the quality document, test results and chemical composition data are indicated at the request of the consumer.

For galvanized steel, which has been awarded the State Quality Mark, the designation of the State Quality Mark is affixed to the quality document.

4.3. To control the dimensions and quality of the surface, 6% of the sheets or one roll from the batch are selected.

4.4. To control the adhesion strength of the coating, mechanical properties, microstructure, one sheet or one roll is selected from the batch.

4.5. Upon receipt of unsatisfactory test results for at least one of the indicators, a re-test is carried out in accordance with GOST 7566-94.

5. TEST METHODS

5.1. The quality of the surface of sheets and rolls is checked by external inspection without the use of magnifying devices.

5.2. For testing, samples are cut from each selected sheet or roll in accordance with the requirements of the drawing and table. 2.

Scheme of cutting samples for testing (b- sheet width)

table 2

Note. Samples are cut out with maximum deviations in size - ± 3 mm.

(Revised edition, Rev. No. 1).

5.3. To determine the weight of the zinc coating, the test sample is degreased, weighed, immersed in a solution of antimony oxide (Sb 2 0 3) or antimony chloride (SbC1 3) in hydrochloric acid and kept until violent gas evolution stops, then the sample is removed from the solution, washed thoroughly with cold, and then with hot water, dry with filter paper and weigh. Degreasing is carried out with technical synthetic ethyl alcohol.

A solution of antimony oxide or antimony chloride is prepared in the following way: 20 g of antimony oxide (or 32 g of antimony chloride) is dissolved in 1000 ml of concentrated hydrochloric acid (GOST 3118-77) for the second and first classes or 50 g of antimony oxides of class P.

Mass of zinc coating applied on both sides of the sheet, in grams (t) per 1 m 2 calculate

according to the formula

where t 1 - mass of three samples (3, 4 and 5) before the dissolution of the zinc coating, with an error of 0.01 g, g;

m 2 - mass of three samples (3, 4 and 5) after the dissolution of the zinc coating, with an error of 0.01 g, g;

S- the actual surface area of ​​the samples with an error of 1 · 10 - 6 m 2 , m 2 .

To determine the weight of the zinc coating, it is allowed to use other methods that provide the necessary accuracy.

The method specified in this standard is applied in case of disagreement in the assessment.

(Changed edition, Rev. No. 1, 2).

5.4. The variation in thickness of the coating in the transverse direction of the sheet is determined as the absolute difference between the maximum and minimum values ​​of the coating thickness on the samples 3, 4 and 5 according to the formula

where T 3 - coating thickness of the corresponding sample, microns;

m 3 - mass of the sample before removal of zinc, g;

m" 3 - mass of the sample after removal of zinc, g;

7.13 - density of zinc, g/cm 3 ;

S 3 - surface area of ​​the zinc coating, cm 2 .

(Revised edition, Rev. No. 1).

5.4.1. The average value of the thickness and thickness difference of the zinc coating of the surface of the sheet with a differentiated coating is determined and calculated for each of the sides. To do this, after degreasing the sample, one of the sides is covered with a dense layer of rubber glue or paraffin and zinc is removed from the opposite side, as indicated above. After re-weighing, the glue or paraffin is removed mechanically or in hot water. The removal of the zinc coating from the other side of the sample is carried out in the same way.

5.9. The bending test of galvanized steel up to 1 mm thick inclusive at an angle of 180 ° is carried out in accordance with GOST 14019-2003. A sample of galvanized steel is tested on a mandrel equal to the thickness of the rolled product.

Galvanized steel of the highest quality must withstand a 180° bending test without a mandrel until the sides meet.

By agreement between the consumer and the manufacturer, the bending test can be replaced by a test for a double roof lock according to OST 1411-196-86, and for galvanized steel of the PK group, by testing on a U-1A device according to GOST 4765-73.

Galvanized steel with a thickness of more than 1.0 mm is tested at the request of the consumer according to the procedure agreed upon in the prescribed manner.

5.10. To control the quality of galvanized steel, it is allowed to use non-destructive control methods.

(Changed edition, Rev. No. 2).

6. MARKING, PACKAGING, TRANSPORT AND STORAGE

6.1. Marking, packaging, transportation and storage - in accordance with GOST 7566-94 with additions.

6.2. To protect the surface of galvanized steel from corrosion, conservation is carried out: passivation, oiling or passivation and oiling.

At the request of the consumer, galvanized steel is not preserved.

When shipped to the regions of the Far North and areas equated to them, conservation is obligatory.

6.3. Sheets of galvanized steel are formed into a pack, laying one sheet on top of another. For sheets with a differentiated coating, the side with the 2nd class of coating thickness should face the bottom of the pack.

The end and side surfaces of the pack are lined with channels made of annealed steel sheet with a thickness of at least 0.4 mm according to the normative and technical documentation.

Wooden bars must be attached to the bottom of the pack in accordance with GOST 2695-83 and GOST 8486-86 with a section of at least 80x80 mm or metal bars according to regulatory and technical documentation. The number of wooden and metal bars with a pack width of up to 1200 mm - 2 pcs.; over 1200 mm - respectively 3 pcs. and 2 pcs.

6.4. Differentially coated galvanized steel coils are rolled so that the side with the 2nd zinc coating thickness class is located inside the coil.

6.5. Bundles and rolls must be tightly tied. The number of strappings must comply with the requirements of GOST 7566-94.

When shipped to the Far North and hard-to-reach areas, the minimum number of strappings must be one more than the norms established in accordance with GOST 7566-94.

For strapping, a metal tape with a thickness of 1.2 - 2.0 mm, a width of 30 to 40 mm is used in accordance with GOST 3560-73, GOST 6009-74 or other regulatory and technical documentation.

The outer diameter and width of the rolls should not exceed 2 mm, the length, width and height of the bundles should not exceed 6.2 and 1 m, respectively.

6.6. The mass of one package must be at least 3 tons and should not exceed 10 tons. Until 01/01/88, at the request of the consumer, the mass of a pack of galvanized steel sheets should not exceed 5 tons.

6.7. Transport marking of packages should be applied in accordance with GOST 14192-96 with dark-colored paint on end surface packs and the side surface of the roll and contain basic, additional and informational inscriptions.

6.8. Transportation of galvanized steel by rail carried out by open rolling stock in accordance with the rules for the carriage of goods in force on this type of transport and the conditions for loading and securing goods approved by the Ministry of Railways.

6.9. Storage of galvanized steel must comply with the conditions of ZhZ in accordance with GOST 15150-69, excluding co-location with chemically active substances.

Sec. 6. (Revised edition, Rev. No. 2).

GOST 14918-80

INTERSTATE STANDARD

By the Decree of the USSR State Committee for Standards dated March 31, 1980 No. 1465, the introduction date was set

01.07.81

The validity period was removed according to protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

This standard applies to sheet and coil cold-rolled steel, hot-dipped galvanized in continuous galvanizing units, intended for cold profiling, for painting, for the manufacture of stamped parts, utensils, containers and other metal products.

The technical level indicators established by this standard meet the requirements of the highest and first category of quality.

1. CLASSIFICATION

1.1. Sheet steel galvanized (OTs) is subdivided:

assigned to groups

for cold stamping - ХШ,

for cold profiling - HP,

for coloring (trained) - PC,

general purpose - OH;

by pulling ability
(steel group X W) per category

normal hood - H,

deep drawing - G,

very deep drawing - VG;

according to the uniformity of the thickness of the zinc coating

with normal thickness variation - HP,

with reduced thickness variation - UR.

(Revised edition, Rev. No. 1).

1.2. By agreement between the consumer and the manufacturer, galvanized steel can be produced:

with crystallization pattern - KR,

without crystallization pattern - MT.

1.3. Depending on the thickness of the coating, galvanized steel is divided into three classes in accordance with those indicated in Table. one.

Table 1

In the manufacture of steel with a differentiated coating, its thickness on one side of the sheet must correspond to class 2, and on the other side to class P (for sheets) or class 1.

2. ASSORTMENT

2.1. Galvanized steel is produced with a width of 710 to 1800 mm inclusive, a thickness of 0.5 to 2.5 mm inclusive.

2.2. Dimensions, maximum deviations and other requirements for the assortment must comply with the requirements of GOST 19904-90.

Galvanized steel of the highest quality category is produced by:

with a crescent of rolled steel no more than 6 mm per 3 m of length;

with flatness PV and PU and permissible deviations of thickness according to the standards of increased rolling accuracy;

with telescopic rolls with steel width up to 1000 mm no more than 30 mm.

Legend Examples

Galvanized steel with a thickness of 0.8, a width of 1000, a length of 2000 mm, normal rolling accuracy B, normal flatness PN, with an unedged edge NO of the OH group, with a crystallization pattern of KR, the first class of zinc coating according to GOST 14918-80:

Galvanized rolled steel with a thickness of 1.2, a width of 1000 mm, increased rolling accuracy A, with a cut edge O, grade 08kp, very deep drawing VG, without a crystallization pattern MT, with a reduced thickness variation UR, the second class of coating according to GOST 14918-80:

Galvanized rolled steel with a differentiated coating 0.5 thick, 710 mm wide, increased rolling accuracy A, with cut edge O, grade Bst3kp, for PC painting, without crystallization pattern MT with reduced thickness variation UR, coated on one side of the first, and on another second class according to GOST 14918-80:

Chapter. 2. (Revised edition, Rev. No. 2).

3. TECHNICAL REQUIREMENTS

3.1. Galvanized steel must be manufactured in accordance with the requirements of this standard for technical documentation approved in the prescribed manner.

3.2. Galvanized steel is made from carbon cold-rolled coiled steel with surface quality in accordance with GOST 16523-97. Steel grades must correspond to those given in table. 1a.

Table 1a

This standard applies to sheet and coil cold-rolled steel, hot-dipped galvanized in continuous galvanizing units, intended for cold profiling, for painting, for the manufacture of stamped parts, utensils, containers and other metal products.

The technical level indicators established by this standard meet the requirements of the highest and first category of quality.

1. Classification

1.1. Sheet steel galvanized (OTs) is subdivided:

Assigned to groups

• For cold stamping - ХШ,
• For cold profiling - HP,
• For coloring (training) - PC,
• General purpose - ON;

According to the ability to draw (steel of the XSh group) into categories

• Normal drawing - H,
• Deep drawing - G,
• Very deep drawing - VG;

According to the uniformity of the thickness of the zinc coating

• With normal thickness variation - HP,
• With reduced thickness variation - UR.

1.2. By agreement between the consumer and the manufacturer, galvanized steel can be produced:

• with crystallization pattern - KR,
• without crystallization pattern - MT.

1.3. Depending on the thickness of the coating, galvanized steel is divided into 3 classes in accordance with the table. one.

Table 1

In the manufacture of steel with a differentiated coating, its thickness on one side of the sheet must correspond to class 2, and on the other side - class P (for sheets) or class 1.

2. Assortment

2.1. Galvanized steel is made with a width of 710 to 1800 mm inclusive, a thickness of 0.5 to 2.5 mm inclusive.

2.2. Dimensions, limit deviations and other requirements for the assortment must comply with the requirements of GOST 19904-74.

Legend Examples

Galvanized steel with a thickness of 0.8, a width of 1000, a length of 2000 mm, normal rolling accuracy B, normal flatness PN, with an unedged edge NO of the OH group, a crystallization pattern of KR, the first class of zinc coating according to GOST 14918-80:

Galvanized rolled steel with a differentiated coating 0.5 thick, 710 mm wide, increased rolling accuracy A, high planar PV, with cut edge O, grade Bst3kp, for PC painting, without crystallization pattern MT with reduced thickness variation UR, coated on one side first, and on the other second class according to GOST 14918-80:

3. Technical requirements

3.1. Galvanized steel must be manufactured in accordance with the requirements of this standard according to the technical documentation approved in the prescribed manner.

3.2. Galvanized steel is made from carbon cold-rolled coiled steel with surface quality according to GOST 16523-70. Steel grades must correspond to those given in table 1.

Table 1

3.3. For galvanizing, zinc grades Ts0 and Ts1 are used according to GOST 3640-79 with the addition of aluminum, lead and other metals to the bath. Doping with lead is allowed due to the introduction of zinc grade Ts2.

3.4. The surface of galvanized steel must be clean, with a continuous coating.

3.4.1. It is not allowed to break the continuity of the coating in the form of cracking on small nodules located on defects in the steel base, the classification and dimensions of which are provided for by GOST 16523-70.

3.4.2. On sheets and strips with an unedged edge, edge flaws with a depth exceeding the maximum deviations in width are not allowed.

3.5. For galvanized steel of groups KhSh, KhP and OH, small sagging (sagging, stratification), grains and uneven crystallization of zinc, traces of kinks of the strip and control rollers, local roughness of the coating (rash), light scratches and abrasions that do not destroy the continuity of the zinc coating are allowed, light and matte spots, uneven coloring of the passive film.

3.6. For galvanized steel of the PC group, dark dots and a path (traces) from deformed small sagging (sagging, layering), grains of local roughness of the coating (rash), a matte pattern of zinc crystallization, traces of kinks, stripes, light scratches and abrasions that do not violate continuity are allowed zinc coating, light and matte spots, uneven coloration of the passive film.

3.7. At the request of the consumer, the passive film must have a uniform color.

3.8. The reduced variation in thickness of the zinc coating UR should be no more than 16 for class P, no more than 10 for class 1, and no more than 4 microns for class 2. Galvanized steel of normal thickness variation HP must have a coating thickness within the limits indicated in Table 1.

Galvanized steel of the highest quality category is produced with different thicknesses of the zinc coating for steel of the XSh, KhP and PK groups of class P - no more than 12, class 1 - no more than 8 and class 2 - no more than 3 microns.

3.9. In the place of bending of galvanized steel with a thickness of up to 1.0 mm inclusive, when testing for the strength of adhesion of the coating to the base metal at a bend of 180 °, there should be no delamination of the zinc coating exposing the steel surface. A network of small cracks is allowed along the entire length of the bend and delamination of the coating at a distance of up to 6 mm from the edges of the sample.

3.10. Mechanical galvanized steel must comply with the standards specified in Table. 1b.

1. the depth of the spherical hole of galvanized steel of the XSh group must comply with the standards given in table. 1b.
2. For galvanized steel of the XSh group of the highest quality category, the relative elongation should be 1 unit. more than the norms of the table. 1b, and the depth of the spherical hole is 0.2 mm more than the norms of Table. 1c.

Table 1 b

Note. The values ​​of tensile strength and relative elongation for galvanized steel of the XSh group of drawing categories N and G of relative elongation for steel of the HP and PK groups are optional until 07/01/89.

When calculating the tensile strength and yield strength, the thickness of the zinc coating is not taken into account.

Table 1c

Notes:

1. For galvanized steel of intermediate thicknesses, the depth of the spherical hole must comply with the standards established for the nearest smaller thickness.
2. Spherical dimple depth values ​​for galvanized steel over 1.5 mm thick are optional until 07/01/89.
3. When tested on devices of the MTL-10 g type, the norms for the depth of a spherical hole are reduced by 0.3 mm.

3.11. Galvanized steel of the XSh group is made with a ferrite grain size of points 7, 8, 9, 10 according to GOST 5639-82 for VG hood categories and not less than 6 points for G hood categories.

For galvanized steel of category VG, uneven grain is allowed within two adjacent numbers, for sheets of category G - within three adjacent numbers.

3.12. For galvanized steel of group ХШ of category VG, the presence of structurally free cementite is allowed within the limits of points 0, 1, 2 and 3 of scale 1 according to GOST 5640-68. For drawing categories G and H, the presence of structurally free cementite is not standardized.

3.13 The number of bends without fracture of galvanized steel of the groups KhP, PK, OH must comply with the standards established in Table. 1g

Table 1d

Note. The bending standards for galvanized steel with a thickness of more than 1.5 mm are optional until 07/01/89.

3.14. (Deleted, Rev. No. 2).

4. Acceptance rules

4.1. Galvanized steel is accepted in batches. The batch must consist of sheets or coils of the same group of galvanized steel, of the same size, of the same type and class, coating thickness, type, preservation, of the same brand and heat (steel of the KhSh, KhP and PK groups) drawing category (steel of the KhSh group), must be issued and accompanied by a quality document in accordance with GOST 7566-81 with the addition of optional quality indicators.

The mass of the batch should not exceed the replacement production of the unit.

4.3. To control the dimensions and quality of the surface, 6% of the sheets or one roll from the batch are selected.

4.4. To control the adhesion strength of the coating, mechanical properties, microstructure, one sheet or one roll is selected from the batch.

4.5. Upon receipt of unsatisfactory test results for at least one of the indicators, a second attempt is carried out in accordance with GOST 7566-81.

6. Marking, packaging, transport and storage.

6.1. Marking, packaging, transportation and storage - in accordance with GOST 7566-81 with additions.

6.2. To protect the surface of galvanized steel from corrosion, conservation is carried out: passivation, oiling or passivation and oiling.

At the request of the consumer, galvanized steel is not preserved.

When shipped to the Far North and hard-to-reach areas, conservation is required.

6.3. Sheets of galvanized steel are formed into a pack, laying one sheet on top of another. For sheets with a differentiated coating, the side with the 2nd class of coating thickness should face the bottom of the pack.

The end and side surfaces of the pack are lined with channels made of annealed steel sheet with a thickness of at least 0.4 mm according to the normative and technical documentation.

Wooden bars must be attached to the bottom of the pack in accordance with GOST 8486-86 and GOST 2695-83 with a section of at least 80x80 mm or metal bars according to regulatory and technical documentation. The number of wooden and metal bars with a pack width of up to 1200 mm - 2 pcs.; over 1200 mm - respectively 3 pcs. and 2 pcs.

6.4. Galvanized steel coils with a differentiated coating are rolled so that the side with the 2nd class of zinc coating thickness is located inside the coil.

6.5. Bundles and rolls must be tightly tied. The number of strappings - according to GOST 7566-81.

6.6. The mass of one package must be at least 3 tons and should not exceed 10 tons.

Until 01/01/88, at the request of the consumer, the mass of a pack of galvanized steel sheets should not exceed 5 tons.

6.7. Transport marking of packages should be applied in accordance with GOST 14192-77 with dark paint on the end surface of the pack and the side surface of the roll and contain main, additional and informational inscriptions.

6.8. Transportation of galvanized steel by rail is carried out by open rolling stock in accordance with the rules for the carriage of goods in force for this type of transport and the conditions for loading and securing goods approved by the Ministry of Railways.

6.9. Storage of galvanized steel must comply with the conditions Zh3 in accordance with GOST 15150-69, excluding co-location with chemically active substances

GOST 14918-80

INTERSTATE STANDARD

TECHNICAL CONDITIONS

Official edition

Standartinform

INTERSTATE STANDARD

ZINC-PLATED STEEL WITH CONTINUOUS LINES

Specifications

Continuously galvanized sheet steel. Specifications

GOST 14918-69

MKS 77.140.50 OKP 11 1110

By the Decree of the USSR State Committee for Standards dated March 31, 1980 No. 1465, the introduction date was set

The validity period was removed according to protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

This standard applies to sheet and coil cold-rolled steel, hot-dipped galvanized in continuous galvanizing units, intended for cold profiling, for painting, for the manufacture of stamped parts, utensils, containers and other metal products.

The technical level indicators established by this standard meet the requirements of the highest and first category of quality.

1. CLASSIFICATION

1.1. Sheet steel galvanized (OTs) is subdivided:

assigned to groups

for cold stamping - KhSh, for cold profiling - KhP, for painting (trained) - PC, general purpose - OH;

according to the ability to draw (steel group XSh) in the category

normal drawing - H, deep drawing - G, very deep drawing - VG;

according to the uniformity of the thickness of the zinc coating

with normal thickness variation - HP, with reduced thickness variation - UR.

(Changed edition, Rev. No. 1).

1.2. By agreement between the consumer and the manufacturer, galvanized steel can be produced: with a crystallization pattern - KR,

without crystallization pattern - MT.

1.3. Depending on the thickness of the coating, galvanized steel is divided into three classes in accordance with those indicated in Table. one.

Official publication Reprint prohibited

Edition (August 2007) with Amendments No. 1, 2, approved in September 1981, June 1986

(IUS 11-81, 9-86).

© Standards Publishing House, 1987 © Standartinform, 2007

Table 1

In the manufacture of steel with a differentiated coating, its thickness on one side of the sheet must correspond to class 2, and on the other side to class P (for sheets) or class 1. (Changed edition, Amendment No. 2).

2. ASSORTMENT

2.1. Galvanized steel is produced with a width of 710 to 1800 mm inclusive, a thickness of 0.5 to 2.5 mm inclusive.

2.2. Dimensions, limit deviations and other requirements for the assortment must comply with the requirements of GOST 19904-90.

Galvanized steel of the highest quality category is produced by:

with a crescent of rolled steel no more than 6 mm per 3 m of length;

with flatness PV and PU and permissible deviations of thickness according to the standards of increased rolling accuracy;

with telescopic rolls with steel width up to 1000 mm no more than 30 mm.

Legend Examples

Galvanized steel with a thickness of 0.8, a width of 1000, a length of 2000 mm, normal rolling accuracy B, normal flatness PN, with an unedged edge NO of the OH group, with a crystallization pattern of KR, the first class of zinc coating according to GOST 14918-80:

B-PN-NO-0.8x 1000 c.u. 2000 GOST 19904-90 IC ON-KR-1 GOST 14918-80

Galvanized rolled steel with a thickness of 1.2, a width of 1000 mm, increased rolling accuracy A, with a cut edge O, grade 08kp, very deep drawing VG, without a crystallization pattern MT, with a reduced thickness variation UR, the second class of coating according to GOST 14918-80:

A-O-1.2x 1000 GOST 19904-90 OTs 08kp VG-MT-UR-2 GOST 14918-80

Galvanized rolled steel with a differentiated coating 0.5 thick, 710 mm wide, increased rolling accuracy A, with cut edge O, grade BstZkp, for PC painting, without crystallization pattern MT with reduced thickness variation UR, coated on one side of the first, and on another second class according to GOST 14918-80:

A-O-0.5x 710 GOST 19904-90 ULL BstZkp-PK-MG-UR- 1/2 GOST 14918-80

Chapter. 2. (Changed edition, Rev. No. 2).

3. TECHNICAL REQUIREMENTS

3.1. Galvanized steel must be manufactured in accordance with the requirements of this standard for technical documentation approved in the prescribed manner.

3.2. Galvanized steel is made from carbon cold-rolled coiled steel with surface quality in accordance with GOST 16523-97. Steel grades must correspond to those given in table. 1a.

Table 1a

(Revised edition, Rev. No. 2).

3.3. For galvanizing, zinc grades Ts0 and Ts1 are used according to GOST 3640-94 with the addition of aluminum, lead and other metals to the bath. Doping with lead is allowed due to the introduction of zinc grade Ts2.

3.4. The surface of galvanized steel must be clean and completely coated.

3.4.1. It is not allowed to break the continuity of the coating in the form of cracking on small nodules located on defects in the steel base, the classification and dimensions of which are provided for by GOST 16523-97.

3.4.2. On sheets and strips with an unedged edge, edge flaws with a depth exceeding the maximum deviations in width are not allowed.

3.4-3.4.2. (Revised edition, Rev. No. 2).

3.5. For galvanized steel of groups KhSh, KhP and OH, small sagging (sagging, stratification), grains and uneven crystallization of zinc, traces of bending of the strip and control rollers, local roughness of the coating (rash), light scratches and abrasions that do not violate the continuity of the zinc coating are allowed, light and matte spots, uneven coloring of the passive film.

3.6. For galvanized steel of the PC group, dark dots and a path (traces) from deformed small sagging (sagging, layering), grains and local roughness of the coating (rash), matte and blurred pattern of zinc crystallization, traces of strip kinks, light scratches and abrasions, are allowed. disrupting the continuity of the zinc coating, light and matte spots, uneven coloring of the passive film.

3.7. At the request of the consumer, the passive film must have a uniform color.

(Revised edition, Rev. No. 2).

3.8. The reduced variation in thickness of the zinc coating UR should be no more than 16 for class P, no more than 10 for class 1, and no more than 4 microns for class 2. Galvanized steel of normal thickness HP must have a coating thickness within the limits indicated in Table. one.

Galvanized steel of the highest quality category is produced with different thicknesses of the zinc coating for steel of the XSh, KhP and PK groups of class P - no more than 12, class 1 - no more than 8 and class 2 - no more than 3 microns.

3.9. In the place of bending of galvanized steel with a thickness of up to 1.0 mm inclusive, when testing for the strength of adhesion of the coating to the base metal at a bend of 180 °, there should be no delamination of the zinc coating exposing the steel surface. A network of small cracks is allowed along the entire length of the bend and delamination of the coating at a distance of up to 6 mm from the edges of the sample.

3.10. in table. sixteen.

The mechanical properties of galvanized steel must comply with the standards specified

Table 16

Note. The values ​​of the relative elongation for galvanized steel of group KhSh of drawing categories N and G, relative elongation for steel group KhP and PK were Lakultative until 01.07.89.

Pii flows of military comparison and has eaten the fluidity of the thickness of the zinc coating is not taken into account.

3.10.1. The depth of the spherical hole of galvanized steel of the XSh group must comply with the standards given in Table. 1c.

Table 1c

Notes:

1. For galvanized steel of intermediate thicknesses, the depth of the scheoic hole should correspond to the nstma established for the next smaller thickness.

2. The values ​​of the depth of the crack hole for galvanized steel with a thickness of more than 1.5 mm were optional until 07/01/89.

3. Pii test on MTJI-10 type poobooah g.

3.10.2. For galvanized steel of the XSh group of the highest quality category, the relative elongation should be 1 unit. more than the norms of the table. 16, and the depth of the spherical hole is 0.2 mm more than the norms of Table. 1c.

3.10-3.10.2. (Revised edition, Rev. No. 2).

3.11. Galvanized steel of the XSh group is made with a ferrite grain size of points 7, 8, 9, 10 according to GOST 5639-82 for VG hood categories and not less than 6 points for G hood category.

For galvanized steel of category VG, uneven grain is allowed within two adjacent numbers, for sheets of category G - within three adjacent numbers.

3.12. For galvanized steel of group ХШ of category VG, the presence of structurally free cementite is allowed within the limits of points 0, 1, 2 and 4 of scale 1 according to GOST 5640-68. For drawing categories G and H, the presence of structurally free cementite is not standardized.

3.13. The number of bends without fracture of galvanized steel of the groups KhP, PK, OH must comply with the standards established in Table. 1g

Table 1d

Note. Hodmh bending of galvanized steel with a thickness of more than 1.5 mm was optional until 07/01/89.

(Revised edition, Rev. No. 2).

3.14. (Deleted, Rev. No. 2).

4. ACCEPTANCE RULES

4.1. Galvanized steel is accepted in batches. The batch must consist of sheets or coils of the same group of galvanized steel, of the same size, of the same type and class of coating thickness, type of conservation, of the same grade and heat (steel of the KhSh, KhP and PK groups) and drawing category (steel of the KhSh group), must be issued and be accompanied by a quality document in accordance with GOST 7566-94 with the addition of the values ​​of optional quality indicators.

The mass of the batch should not exceed the replacement production of the unit.

(Revised edition, Rev. No. 2).

4.2. In the quality document, test results and chemical composition data are indicated at the request of the consumer.

For galvanized steel, which has been awarded the State Quality Mark, the designation of the State Quality Mark is affixed to the quality document.

4.3. To control the dimensions and quality of the surface, 6% of the sheets or one roll from the batch are selected.

4.4. To control the adhesion strength of the coating, mechanical properties, microstructure, one sheet or one roll is selected from the batch.

4.5. Upon receipt of unsatisfactory test results for at least one of the indicators, a re-test is carried out in accordance with GOST 7566-94.

5. TEST METHODS

5.1. The quality of the surface of sheets and rolls is checked by external inspection without the use of magnifying devices.

5.2. For testing, samples are cut from each selected sheet or roll in accordance with the requirements of the drawing and table. 2.

Scheme of an obpazp for testing (b - sheet spike)

table 2

Note. Samples are cut out with maximum deviations in size - +3 mm.

5.3. To determine the weight of the zinc coating, the test sample is degreased, weighed, immersed in a solution of antimony oxide (Sb 2 0 3) or antimony chloride (SbC1 3) in hydrochloric acid and kept until violent gas evolution stops, then the sample is removed from the solution, washed thoroughly with cold, and then with hot water, dry with filter paper and weigh. Degreasing is carried out with technical synthetic ethyl alcohol.

A solution of antimony oxide or antimony chloride is prepared in the following way: 20 g of antimony oxide (or 32 g of antimony chloride) is dissolved in 1000 ml of concentrated hydrochloric acid (GOST 3118-77) for the second and first classes or 50 g of antimony oxides of class P.

The mass of zinc coating applied on both sides of the sheet, in grams (t) per 1 m 2, is calculated by the formula

where m\ is the mass of three samples (.?, 4 and 5) before the dissolution of the zinc coating, with an error of 0.01 g, g; mi is the mass of three samples (.?, 4 and 5) after the dissolution of the zinc coating, with an error of 0.01 g, g;

S is the actual surface area of ​​the samples with an error MO "" 6 m 2 , m 2 .

To determine the weight of the zinc coating, it is allowed to use other methods that provide the necessary accuracy.

The method specified in this standard is applied in case of disagreement in the assessment.

(Changed edition, Rev. No. 1, 2).

5.4. The variation in thickness of the coating in the transverse direction of the sheet is determined as the absolute difference between the maximum and minimum values ​​of the coating thickness on samples 3, 4 and 5 according to the formula

AT'r - 7L qv - T „

for which, first, the thickness of the zinc coating is calculated on each of the samples according to the formula

^ _ (t 3 - t "3) 10 4 (3)

3 7.13 A 3 '

where?z is the thickness of the coating of the corresponding sample, microns;

/from - the mass of the sample before the removal of zinc, g; m "z - mass of the sample after removal of zinc, g;

7.13 - density of zinc, g/cm 3 ;

A3 - surface area of ​​zinc coating, cm 2 .

(Revised edition, Rev. No. 1).

5.4.1. The average value of the thickness and thickness difference of the zinc coating of the surface of the sheet with a differentiated coating is determined and calculated for each of the sides. To do this, after degreasing the sample, one of the sides is covered with a dense layer of rubber glue or paraffin and zinc is removed from the opposite side, as indicated above. After re-weighing, the glue or paraffin is removed mechanically or in hot water. The removal of the zinc coating from the other side of the sample is carried out in the same way.

5.5. The bend test is carried out according to GOST 13813-68.

5.6. The test for drawing a spherical hole is carried out according to GOST 10510-80. Make two measurements in the test area and determine the arithmetic mean.

5.7. The tensile test is carried out according to GOST 11701-84.

5.8. Determination of the grain size of ferrite is carried out according to GOST 5639-82 and structure-free cementite - according to GOST 5640-68.

5.9. The bending test of galvanized steel up to 1 mm thick inclusive at an angle of 180 ° is carried out in accordance with GOST 14019-2003. A sample of galvanized steel is tested on a mandrel equal to the thickness of the rolled product.

Galvanized steel of the highest quality must withstand a 180° bending test without a mandrel until the sides meet.

By agreement between the consumer and the manufacturer, the bending test can be replaced by a test for a double roof lock according to OST 1411-196-86, and for galvanized steel of the PK group, by testing on a U-1A device according to GOST 4765-73.

Galvanized steel with a thickness of more than 1.0 mm is tested at the request of the consumer according to the procedure agreed upon in the prescribed manner.

5.10. To control the quality of galvanized steel, it is allowed to use non-destructive control methods.

(Revised edition, Rev. No. 2).

6. MARKING, PACKAGING, TRANSPORT AND STORAGE

6.1. Marking, packaging, transportation and storage - in accordance with GOST 7566-94 with additions.

6.2. To protect the surface of galvanized steel from corrosion, conservation is carried out: passivation, oiling or passivation and oiling.

At the request of the consumer, galvanized steel is not preserved.

When shipped to the regions of the Far North and areas equated to them, conservation is obligatory.

6.3. Sheets of galvanized steel are formed into a pack, laying one sheet on top of another. For sheets with a differentiated coating, the side with the 2nd class of coating thickness should face the bottom of the pack.

The end and side surfaces of the pack are lined with channels made of annealed steel sheet with a thickness of at least 0.4 mm according to the normative and technical documentation.

Wooden bars must be attached to the bottom of the pack in accordance with GOST 2695-83 and GOST 8486-86 with a section of at least 80x80 mm or metal bars according to regulatory and technical documentation. The number of wooden and metal bars with a pack width of up to 1200 mm - 2 pcs.; over 1200 mm - respectively 3 pcs. and 2 pcs.

6.4. Differentially coated galvanized steel coils are rolled so that the side with the 2nd zinc coating thickness class is located inside the coil.

6.5. Bundles and rolls must be tightly tied. The number of strappings must comply with the requirements of GOST 7566-94.

When shipped to the Far North and hard-to-reach areas, the minimum number of strappings should be one more than the norms established in accordance with GOST 7566-94.

For strapping, a metal tape with a thickness of 1.2-2.0 mm, a width of 30 to 40 mm is used in accordance with GOST 3560-73, GOST 6009-74 or other regulatory and technical documentation.

The outer diameter and width of the rolls should not exceed 2 mm, the length, width and height of the bundles should not exceed 6.2 and 1 m, respectively.

6.6. The mass of one package must be at least 3 tons and should not exceed 10 tons.

Until 01/01/88, at the request of the consumer, the mass of a pack of galvanized steel sheets should not

was over 5 tons.

6.7. Transport marking of packages should be applied in accordance with GOST 14192-96 with dark paint on the end surface of the pack and the side surface of the roll and contain main, additional and informational inscriptions.

6.8. Transportation of galvanized steel by rail is carried out by open rolling stock in accordance with the rules for the carriage of goods in force for this type of transport and the conditions for loading and securing goods approved by the Ministry of Railways.

6.9. Storage of galvanized steel must comply with the conditions of ZhZ in accordance with GOST 15150-69, excluding co-location with chemically active substances.

Sec. 6. (Changed edition, Rev. No. 2).

Editor L.V. Koretnikova Technical editor N.S. Grishanova Corrector RA. Mentova Computer layout L A. Krugovoi

Signed for publication on September 25, 2007. Format 60x84*/8. Offset paper. Headset Times. Offset printing. Uel. oven l. 0.93. Uch.-ed. l. 0.85. Circulation 101 copies. Zach. 728.

FSUE "STANDARTINFORM", 123995 Moscow, Granatny per., 4.

Typed in FSUE "STANDARTINFORM" on a PC.

Printed in the branch of FSUE "STANDARTINFORM" - type. "Moscow printer", 105062 Moscow, Lyalin per., 6