GOST 24244-80

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  ГОСТ 24244-80

GOST 24244−80 the cold rolled sheets from low carbon steel to enamelware. Specifications (with Change No. 1)

GOST 24244−80
Group B33
INTERSTATE STANDARD

THE COLD ROLLED SHEETS FROM LOW CARBON STEEL TO ENAMELWARE

Specifications

Low-carbon steel cold rolled sheet for enamelled ware. Specifications

ISS 77.140.50
OKP 09 7300

Date of introduction 1982−01−01

Resolution of the USSR State Committee on standards of 18 June 1980 N 2872 date of introduction is established 01.01.82
Limitation of actions taken by Protocol No. 2−92 of the Interstate Council for standardization, Metrology and certification (ICS 2−93)

Edition with Change No. 1, approved in October 1986 (IUS 1−87)
This standard applies to cold rolled sheet of low carbon steel with a thickness of 0.5 to 2.5 mm, intended for the manufacture of enamelware.
Indicators of technical level established by this standard, comply with the requirements of the highest and first quality categories.

(Changed edition, Rev. N 1).

1. CLASSIFICATION AND ASSORTMENT

1.1. Cold-rolled steel sheet of low carbon steel classification:

by product:
sheet (sheets and rolls),
tape;
for the ability to draw on the group:
very deep drawing — VG,
deep drawing — G,
normal drawing — N.
(Changed edition, Rev. N 1).

1.2. Assortment hire must meet the requirements of GOST 19904−90 and GOST 19851−74.

Examples of symbols:

Ribbon of steel grade 08KP, normal accuracy of rolling, very deep drawing, group II surface finish, thickness 0,6 mm, width 290 mm:

The sheet of steel grade 08KP, high precision rolling, deep drawing, group II surface finish, thickness of 0.5 mm, width 500 mm, length 1000 mm:

2. TECHNICAL REQUIREMENTS

2.1. Rental made in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

(Changed edition, Rev. N 1).

2.2. Rental produce from the boiling steel grade 08KP with the chemical composition according to GOST 9045−93 with a mass fraction of total aluminum of not more than 0.01% or GOST 1050−88 with a mass fraction of carbon not more than 0.1%, phosphorus — not more than 0.03 percent and total aluminium less than 0.01%.

2.3. Alloying and chemical clogging of steel aluminum is not allowed.

2.4. By agreement with the consumer it is allowed manufacture of rolled products with the first quality class of quality steel stamps 10kp according to GOST 1050−88 or steel of ordinary quality brand St1kp according to GOST 380−94 with a mass fraction of carbon not more than 0.10% of silicon, not more than 0.03%, sulphur not more than 0.04%, of aluminium total not more than 0.01%.

(Changed edition, Rev. N 1).

2.5. Rental produce thermally processed.

2.6. Rental is subjected to training.

2.7. Leaves trimmed from all sides. Sheet and strip, rolled on the continuous rolling mills, produce with cut and uncut edges.

2.8. Rolled edge rolled the first category of quality allowed the tears to a depth not exceeding half of the maximum deviations along the width of the sheet or tape and not outputting them at a nominal size width.

(Changed edition, Rev. N 1).

2.9. Rent rolls should not have edges bent at an angle of 90° and are twisted and crumpled. Not allowed loose and wrinkled rolls.

2.10. The quality of the surface rental shall conform to the requirements of group II finish according to GOST 9045−93 or GOST 16523−97. By agreement between the consumer and the manufacturer is allowed to rent to the first quality class that meets the requirements of group III surface finish according to GOST 16523−97 or GOST 9045−93.

The rolled surface should be rough without the captured, bubbles — bubbles, cracks, residues, slag or dross katanoi, okatannyh metal particles, smoothed out dirt and cuts. Bundle of rentals are not allowed.

2.11. A surface rental should be covered with a uniform layer of 30−36% water emulsion.

The emulsion should be applied to stretched training strip. After application of the emulsion oiling rental mineral oils is not allowed.

At the request of the consumer rental are made without application of the emulsion coating a thin uniform layer of mineral oil or without oiling. On the surface neprimirimogo rental allowed traces of mineral oils.

2.10, 2.11. (Changed edition, Rev. N 1).

2.12. The ferrite grains should be equiaxed. Grain size of ferrite, rolled in very deep and deep-drawing must correspond to 6, 7, 8 and 9 numbers.

Allowed uneven grain rolled very deep-drawing in two rooms, and rental deep drawing within three interconnected rooms. The content of structural-free cementite should be no higher than the third score.

2.13. The mechanical properties of the rolled products should conform to the standards specified in table.1.

Table 1

Note. With plate thickness of up to 0.7 mm, inclusively allowed the value of the yield strength of 270 MPa (27,5 kgf/mm).

(Changed edition, Rev. N 1).

2.14. At the request of the consumer rental is top quality supplied with normalized yield strength and high elongation. Norms are established by agreement between the consumer and the manufacturer.

2.15. The depth of wells with the test extrusion must conform to the standards specified in table.2.

Table 2

mm

2.16. For rental of intermediate thickness standards the depth of the spherical dimples are all taken at the nearest lower thickness specified in table.2.

2.17. The amount of elongation and the depth of the spherical dimples guaranteed by the manufacturer for 10 days. from the date of shipment.

2.18. Rental a deep and normal hoods shall withstand a bend test 180° in a cold state without a gasket. In the curve should be free of tears, cracks, delamination.

2.19. Spalling of the enamel coating when tested rolled on the tendency to the formation of defect «fish scales» should be absent for three or more samples from five selected of top quality and completely absent in the samples from the rentals of the highest quality.

2.20. The requirements of clause 2.19 optional until January 1, 1986

3. ACCEPTANCE RULES

3.1. Rental take parties. The party must consist of one steel melting, the charge in one furnace or one mode of heat treatment furnaces for continuous operation, one group of hoods, same thickness and decorated by one document on quality.

3.2. To check the quality of hire from each party select two sheets or one roll.

3.3. The lack of inclination of the rental to the formation of defect «fish scales» provided by technology and are inspected and tested by the manufacturer — the change of technology, consumer — during incoming inspection at least once per month.

(Changed edition, Rev. N 1).

3.4. If unsatisfactory test results of at least one of the indicators, repeat tests carried out according to GOST 7566−94.

4. TEST METHODS

4.1. Sampling for chemical analysis according to GOST 7565−81.

4.2. Chemical analysis were carried out according to GOST 22536.0−87 GOST 22536.1−88, GOST 22536.2−87, GOST 22536.3−88, GOST 22536.4−88, GOST 22536.5−87, GOST 22536.6−88, GOST 22536.7−88, GOST 22536.8−87, GOST 22536.9−88, GOST 22536.10−88 or other methods providing the required accuracy.

4.3. The surface quality of the rolled check visual inspection without the use of magnifying devices.

4.4. In case of disagreement on the assessment of surface roughness is determined according to GOST 2789−73. The rules of roughness is determined by agreement between the consumer and the manufacturer.

4.5. Dimensional control and flatness of the rolled carried out according to GOST 19904−90.

4.6. For testing mechanical and technological properties of rental from each selected sheet or roll cut. Place the cuttings sample is determined in accordance with GOST 7564−97.

4.7. The tests are carried out:

tensile — according to GOST 11701−84 on samples with width of 20 mm and an estimated length of 80 mm;

the amount of grain according to GOST 5639−82;

the presence of structurally free cementite — GOST 5640−68 scale (1);

bending — according to GOST 14019−80.

4.8. Test rolled to the squeezing is carried out according to GOST 10510−80. Each sample is tested in three places corresponding to the middle and the edges along the width of the rolled (not closer than 40 mm from the edge).

Allowed to test on the device Ericksen samples with a width of 80−90 mm.

(Changed edition, Rev. N 1).

4.9. (Deleted, Rev. N 1).

4.10. By agreement between the consumer and the manufacturer to assess the quality of hire can be used statistical and non-destructive methods of control, agreed in the prescribed manner.

4.11. Test rolled to the tendency to the formation of defect «fish scales» carried out by the method specified in Appendix 1.

(Changed edition, Rev. N 1).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

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

5.2. The marking shall additionally include the designation: «enamel».

5.3. Transport marking of packages — according to GOST 14192−96.

5.4. The rolled sheets are Packed in bundles (box) weight up to 5 t, in agreement with the consumer — up to 10 T. the Mass of the roll must not exceed 5 tons Weight of cargo space-rolled in coils should not exceed 10 tons in packs (boxes) — 5 t, in agreement with the user 10, etc

5.5. Stack of sheets and rolls wrap packaging bituminoase or degtevoj paper according to GOST 515−77 or double layer packaging paper grades B-70, B-80, B-70, B-80, G-80 according to GOST 8828−89.

The wrapped foot is Packed in metal boxes, the scheme of which is given in Annex 2 or in bundles. Packs formed from the upper and lower packaging sheets, lateral and angular channels (curved sheets). Boxes and bundles are placed on wooden beams with section of 80x80 mm and tied with steel tapes. Longitudinal strapping must be attached to the bottom of the boards with nails or screws.

Paper wrapped coils Packed by metal sheet at the outer and inner surfaces. The end surface of the roll cover with lids. Then roll tied with steel tape.

The number of straps on boxes, packs and rolls must conform to GOST 7566−94. Used for strapping steel strip thickness 0,7−1,5 mm and a width of 25−30 mm according to GOST 3560−73, or other regulatory-technical documentation.

5.6. Rental transporterowych in open vehicles by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species. When transporting by rail stowage and securing of cargo must comply with the conditions of loading and fastening of cargoes, approved by the Ministry of Railways.

5.7. Storage conditions of hire — 3 (J3) according to GOST 15150−69.

Section 5. (Changed edition, Rev. N 1).

ANNEX 1 (mandatory). A method of determining the tendency of steel to the formation of the enamel coating defect «fish scales» by etching in hydrochloric acid

ANNEX 1
Mandatory

To determine the suitability of steel for enamelling stamped samples having the shape of a hollow cylinder with a diameter of 70−120 mm or a cut plate having a size of 50x60 mm, 40 mm, retreating from the edge of the sheet or roll.

After thermal degreasing at (700±10) °C for 3 min, etching in 8% strength sulfuric acid solution at (70±5) °C for 10 min, rinsing, neutralization in soda solution (5 g/l) and drying at 100 °C — 120 °C samples were subjected to the enameling on one side (outside) ground enamel ESG-21 with additions of sand, clay and borax at the rate of 100 g ground enamel ESG-21, 15 g sand, 6 g of clay, 0.3 g of borax and cover with enamel ESP-117. The firing temperature of the enamel dirt at 900 °C — 910 °C, the coating of the enamel 830 °C and 840 °C. the firing Time samples with thickness 0,5−0,7 mm — 2 min; 0,7−1,0 mm — 3 min; 1.0 mm — 4 min.

The enamel shall meet the requirements of GOST 24405−80.

The samples should be covered with one layer of dirt enamel of a thickness not exceeding 0.18 mm and one layer of topcoat enamel. The total coating thickness is 0.25−0.35 mm. For the test, select five specimens without surface defects.

In enamelled on the one hand, the samples having the form of a hollow cylinder, pour the solution, and the plate is immersed vertically so that whether side not in contact, in a vessel with hydrochloric acid solution at the rate of 1.2−1.5 ml/cmnot enameled surface.

For testing use the solution of hydrochloric acid density of 1,061 g/cm. The solution temperature during the test should be in the range of 23 °C — 26 °C. the Samples in the solution aged 20 min, after which acid was poured, samples were washed in running water, wipe to remove moisture and placed in a desiccator for 24 h or left wrapped in paper for 24 hours then visually determine the presence of splits on the enamel surface.

APPENDIX 1. (Changed edition, Rev. N 1).

ANNEX 2 (mandatory). The scheme of packing of sheet metal, in metal box

ANNEX 2
Mandatory

1 — box; 2 — cover; 3 — obvjazki; 4 — wood; 5 — wrapping paper; 6 — hire in the leaves

APPENDIX 2. (Added, Rev. N 1).