GOST 14918-80

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  ГОСТ 14918-80

GOST 14918−80 galvanized sheet Steel from continuous lines. Specifications (with Amendments No. 1, 2)

GOST 14918−80

Band Q23

INTERSTATE STANDARD

GALVANIZED SHEET STEEL FROM CONTINUOUS LINES

Specifications

Continuously galvanized sheet steel. Specifications

ISS 77.140.50
GST 11 1110

Date of introduction 1981−07−01

Resolution of the USSR State Committee for standards from March 31, 1980 N 1465 date of introduction is established 01.07.81

Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

REPLACE GOST 14918−69

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

This standard applies to sheets and coils of cold rolled steel, hot-galvanized in continuous galvanizing, intended for cold forming, for painting, production of stamped parts, utensils, containers and other metal products.

Indicators of technical level established by this standard, comply with the requirements of the highest and first quality categories.

(Changed edition, Rev. N 2).

1. CLASSIFICATION

1.1. Galvanized steel sheet (OTS) is subdivided:

by appointment for groups

for cold forming — XIII,

for cold forming — HP,

for painting (a trained) — PC

General purpose — HE;

by the ability to extract (steel group XIII) in the category

normal drawing — N,

deep drawing — G,

very deep drawing — VG;

for uniformity of zinc coating thickness

with a normal thickness variation — HP

with reduced thickness variation — UR.

(Changed edition, Rev. N 1).

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

pattern of crystallization — CU,

without the pattern of crystallization — MT.

1.3. Depending on coating thickness the galvanized steel is divided into three classes in accordance with the specified in table.1.

Table 1

In the manufacture of steel of varying coating thickness on one side of the sheet should correspond to the 2nd class, and on the other side of the class P (for sheets) or class 1.

(Changed edition, Rev. N 2).

2. ASSORTMENT

2.1. Galvanized steel manufactured with width from 710 to 1800 mm, inclusive, thickness from 0.5 to 2.5 mm inclusive.

2.2. Dimensions, limit deviations and other requirements for grades must meet the requirements of GOST 19904−90.

Galvanized steel of the highest quality manufactures:

with the camber of rolled steel not more than 6 mm per 3 m length;

with flatness PV and PU and allowable deviations of thickness according to the norms of high precision rolling;

with telescopically of steel coils with a width up to 1000 mm of 30 mm.

Examples of symbols

Galvanized steel with thickness of 0.8, width 1000, length 2000 mm, of normal rolling accuracy B, the normal flatness MON, mill edge BUT HE, with a pattern of crystallization of CU, the first grade of zinc coating according to GOST 14918−80:

Galvanized steel coils thickness 1.2 m, width 1000 mm, high precision rolling And, with the cut edge On, grade 08KP, very deep drawing of VG, without the pattern of crystallization MT, with reduced thickness variation of UR, of the second class of coverage in accordance with GOST 14918−80:

Galvanized rolled steel of varying coating thickness 0.5, width 710 mm, high precision rolling And, with the cut edge On, brand БСт3кп, for painting the PC without the pattern of crystallization of MT with a reduced thickness variation of UR, coated on one side first and the other second class according to GOST 14918−80:

Note. Category of steel XIII is specified in the order, and the legend shall be marked with the index the ability to draw (N, G or VG).

Section 2. (Changed edition, Rev. N 2).

3. TECHNICAL REQUIREMENTS

3.1. Galvanized steel shall be manufactured in accordance with the requirements of the present standard, using technical documentation approved in the established order.

3.2. Galvanized steel is made from carbon cold rolled steel surface quality according to GOST 16523−97. Grade of steel shall be as given in table.1A.

Table 1A

(Changed edition, Rev. N 2).

3.3. For galvanizing, apply zinc grades C0 and C1 according to GOST 3640−94 with the addition to the bath of aluminum, lead and other metals. Allowed the alloying of lead due to the introduction of zinc brand C2.

3.4. The surface of the galvanized steel must be clean with solid floors.

3.4.1. Not allowed discontinuity of the coating in the form of cracking in small nodules, located on the defects of a steel framework, classification, and dimensions which provide for the GOST 16523−97.

3.4.2. On leaves and strips with mill edge are not allowed flaw depth edges, exceeding the limit deviations on width.

3.4−3.4.2. (Changed edition, Rev. N 2).

3.5. For galvanized steel groups XIII, KHP and HE permitted small flows (sinters, layering), grains and non-uniform crystallization of zinc, traces of kinks, bands and adjustable rollers, the local roughness of the coating (rash), light scratches and fading, do not violate the continuity of the zinc coating, bright and matte spots, uneven coloring of the passive film.

3.6. For galvanized steel band, PC allowed the dark point and the track (trace) of the deformed small nodules (sinters, layering), grains and local roughness (rash), Matt and blurred the pattern of crystallization of zinc, traces of kinks, the band, light scratches and scuff marks that do not violate the continuity of the zinc coating, bright 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. N 2).

3.8. Reduced the variable thickness of the zinc coating SD should be for a class of P — 16, class 1 — 10, class 2 — not more than 4 µm. Galvanized steel normal thickness HP should have a coating thickness within the limits specified in table.1.

Galvanized steel of the highest quality manufacture of a variable thickness of the zinc coating for steel groups XIII, HP and PC class P — not more than 12, class 1 — 8 and class 2 — not more than 3 µm.

(Changed edition, Rev. N 1, 2).

3.9. In the bend of galvanized steel with thickness up to 1.0 mm inclusive when tested for strength of adhesion of the coating to the base metal when bending by 180° should not be peeling of the zinc coating, exposing the steel surface. Allowed mesh of fine cracks throughout the length of the bending and delamination of the coating at a distance of 6 mm from the edges of the sample.

3.10. Mechanical properties of galvanized steel should conform to the standards specified in table.1B.

Table 1B

3.10.1. The depth of the spherical dimples galvanized steel band XIII shall conform to the standards given in table.1B.

Table 1B

mm

3.10.2. For galvanized steel of group XIII of the highest quality the amount of elongation should be on 1 unit more of the rules table.1B, and the depth of the spherical holes by 0.2 mm larger than the rules table.1B.

3.10−3.10.2. (Changed edition, Rev. N 2).

3.11. Galvanized steel group XIII are made with the grain size of ferrite points 7, 8, 9, 10 according to GOST 5639−82 for the categories drawing of VG and not below the score of 6 for category-drawing G.

For galvanized steel professional hood SH is allowed by the unevenness of the grain in two adjoining rooms, the category of G — within three interconnected rooms.

3.12. For galvanized steel band XIII category drawing VG is allowed structurally-free cementite within the points 0, 1, 2 and 4 of the scale 1 according to GOST 5640−68. For categories extracts d and N the presence of structurally free cementite is not standardized.

3.13. Number of bends without fracture of the galvanized steel of the groups HP, PC, IT must meet the standards established in table.1G.

Table 1G

(Changed edition, Rev. N 2).

3.14. (Deleted, Rev. N 2).

4. ACCEPTANCE RULES

4.1. Galvanized steel accepted by the parties. The party should consist of sheets or rolls of one group galvanized steel, one size, one type and class of coating thickness, type of conservation, one brand and smelting (steel groups XIII, x and PC) and category hood (steel band XIII), must be completed and be accompanied by a document of quality according to GOST 7566−94 with the addition of the values of the optional quality indicators.

The weight of the batch shall not exceed replacement of the production unit.

(Changed edition, Rev. N 2).

4.2. In the document about the quality of test results and data of the chemical composition specified by the consumer.

For galvanized steel, which has the state quality Mark, a quality document shall bear the designation of the state quality Mark.

4.3. To control the size and surface select 6% sheets or one roll from the party.

4.4. To control the strength of adhesion of the coating, mechanical properties, microstructure are taken one sheet or one roll from the party.

4.5. If unsatisfactory validation results at least one of the indicators of re-examination is carried out according to GOST 7566−94.

5. TEST METHODS

5.1. The surface quality of the sheets and coils checked by visual inspection without the use of magnifying devices.

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

Scheme of cutting of samples for testing

Scheme of cutting of samples for testing (the width of the sheet)

Table 2

(Changed edition, Rev. N 1).

5.3. To determine the mass of zinc coating the test specimen is degreased, weighed, immersed in a solution of antimony oxide () or antimony chloride () in hydrochloric acid and allowed to stand until the cessation of rapid outgassing, and then the specimen is removed from the solution, washed thoroughly with cold and then with hot water, dried with filter paper and weighed. Degreasing is a technical synthetic ethyl alcohol.

The solution of antimony oxide or antimony chloride is prepared by the following method: 20 g of antimony oxide (or 32 g of antimony chloride) was dissolved in 1000 ml of concentrated hydrochloric acid (GOST 3118−77) for first and second class or 50 g of oxides of antimony class P.

Mass of zinc coating, applied to the two sides of the sheet in grams (a) at 1 mcalculated by the formula

, (1)

where is the mass of three samples (3, 4 and 5) to dissolve the zinc coating, with an accuracy of 0.01 g, g;

 — the mass of three samples (3, 4 and 5) after dissolving the zinc coating, with an accuracy of 0.01 g, g;

 — actual area of the sample surface with an accuracy of 1·10m, m.

To determine the mass of zinc coating is allowed to use other methods to ensure the required accuracy.

The method specified in this standard, applies when the dispute in the assessment.

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

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

, (2)

at first calculate the thickness of zinc coating on each of the samples according to the formula

, (3)

where the coating thickness of the corresponding sample, mm;

 — the sample mass before the removal of zinc, g;

 — weight of sample after removal of zinc, g;

 — the density of zinc, g/cm;

 — the surface area of the zinc coating, cm.

(Changed edition, Rev. N 1).

5.4.1. The average thickness and the variable thickness of the zinc coating of the sheet surface with a graded coating is determined and calculated for each of the parties. For this, after degreasing the sample, one side is covered with a dense layer of rubber cement or wax, and from the opposite side and remove the zinc as described above. After re-weighing the glue or the wax is removed by mechanical means or in hot water. Removal of the zinc coating on the other side of the sample is carried out similarly.

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

5.6. Test on the hood of the spherical hole is carried out according to GOST 10510−80. Make two measurements in the test area and determine the arithmetic mean value.

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

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

5.9. Bend test of galvanized steel with thickness up to 1 mm inclusive at an angle of 180° is carried out according to GOST 14019−2003. A sample of the galvanized steel you experience on the mandrel equal to the thickness of the rental.

Galvanized steel of the highest quality category must withstand a bend test 180° without a mandrel to the contact.

By agreement between the consumer and the manufacturer the bend test may be replaced by a test double roofing castle OST 1411−196−86, and for galvanized steel band, PC the test, the device-1A according to GOST 4765−73.

Galvanized steel of thickness over 1.0 mm are experiencing at the customer’s request the procedure agreed in the prescribed manner.

5.10. For quality control of galvanized steel is allowed to apply non-destructive methods of control.

(Changed edition, Rev. N 2).

6. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

6.1. Marking, packaging, transportation and storage — by GOST 7566−94 with additions.

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

At the customer’s request galvanized steel not canned.

When shipping to the far North regions and equated areas preservation required.

6.3. The galvanized steel sheet, formed into a stack, laying one sheet on another. Have sheets with a graded coating side with the 2nd class of coating thickness should be towards the bottom of the pack.

The face side of the bundle draped channels made from annealed steel sheet with a minimum thickness of 0.4 mm according to normative-technical documentation.

The edges from the bottom must be attached to the pieces of wood according to GOST 2695−83 and GOST 8486−86 with section of 80x80 mm or metal bars according to normative-technical documentation. A number of wooden and metal bars with a width of up to 1200 mm bundle — 2 items; over 1200 mm, respectively 3 PCs. and 2 PCs.

6.4. Coils of galvanized steel with a differential coating roll so that the side with the 2nd class of the zinc coating thickness is inside of the roll.

6.5. Packs and rolls must be tightly bound. The number of studs must comply with the requirements of GOST 7566−94.

When shipping to the far North and remote areas of the minimum number of straps must be one more than the norms established by GOST 7566−94.

Strapping used metal tape having a thickness of 1.2−2.0 mm, width from 30 to 40 mm according to GOST 3560−73, GOST 6009−74 or other regulatory-technical documentation.

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

6.6. Mass per package shall be not less than 3 m and must not exceed 10 T.

01.01.88 to customer’s request weight bundles of galvanized steel sheet shall not exceed 5 tons.

6.7. Transport marking of packages must be applied according to GOST 14192−96 paint a dark color on the end surface of the bundle and the lateral surface of the roll and contain basic, additional and informational inscriptions.

6.8. Transportation galvanized steel rail carry open rolling stock in accordance with cargo carriage regulations applicable to transport of this form and the conditions of loading and fastening of cargoes, approved by MPs.

6.9. Storage galvanized steel must comply with the conditions ZHZ according to GOST 15150−69, excluding joint finding with chemically active substances.

Sec. 6. (Changed edition, Rev. N 2).