GB/T 33974-2017Hot rolling checker steel sheet and strip (English PDF)

1 Scope

This standard specifies the classification and code number, order content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, markings and quality certificates for hot rolling checker steel sheet and strip.

This standard applies to diamond-shaped, lentil-shaped, round bean-shaped and combination-shaped hot rolling checker steel sheet and strip (hereinafter referred to as steel sheet and strips) having a thickness of 1.4 mm ~ 16.0 mm.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.

GB/T 222 Permissible tolerances for chemical composition of steel products

GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature

GB/T 232 Metallic materials - Bend test

GB/T 247 General rule of package mark and certification for steel sheets (sheets) and strips

GB/T 700 Carbon structural steels

GB/T 709 Dimensions, shape, weight and tolerances for hot rolled steel sheets and strips

GB/T 712 Structural steel for ship and marine engineering

GB/T 1591 High strength low alloy structural steels

GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing

GB/T 4171 Atmospheric corrosion resisting structural steel

GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 17505 Steel and steel products General technical delivery requirements

GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition

3 Classification and code

3.1 Classification by edge status is as follows.

a) Trimming, EC;

b) Not trimming, EM.

3.2 Classification by shape of the pattern is as follows.

a) Diamond, LX;

b) Lentil-shape, BD;

c) Round bean shape, YD;

d) Combined shape, ZH.

4 Order contents

4.1 Contracts or orders placed under this standard shall include the following.

a) This standard number;

b) Grade;

c) Product category (steel sheet or strip);

d) Specifications;

e) Pattern shape;

f) Edge status;

g) Other requirements.

5 Dimension, shape, weight

Table 3 -- Steel sheet flatness, in millimeters

Thickness 1.4 ~ 2.5: flatness not more than 15.

Thickness > 2.5 ~ 4.0: flatness not more than 12.

Thickness > 4.0 ~ 16.0: flatness not more than 10.

Measured length 1000.

5.5 Other sizes and shapes of steel sheets and strips are to comply with the requirements of GB/T 709.

5.6 Steel sheets and strips are delivered by actual weight. In accordance with the requirements of the purchaser, the steel sheet can refer to Appendix A and be delivered by theoretical weight.

6 Technical requirements