GB/T 5313-2023Steel plate with through-thickness properties (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 5313-2010 Steel plates with through-thickness characteristics. Compared with GB/T 5313-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The term and definition of "through-thickness properties" is added (see Chapter 3);

b) The requirements for the Reduction of Area are changed (see Notes 1 and 2 of Table 2; see Table 2 of the 2010 version);

c) The specimen preparation of steel plates is changed (see 6.2; see 5.2 of the 2010 edition);

d) The requirements for specimens of steel plates with extensions are changed (see 6.3; see 5.3 of the 2010 edition);

e) The requirements for specimens of steel plates without extensions are changed (see 6.4; see 5.3 of the 2010 edition);

f) The specimen preparation and type diagrams are changed (see Figure 1 of 6.3, Figure 2 and Figure 3 of 6.4; see Figure B.1~Figure B.3 of the 2010 version);

g) The inspection rules are changed (see 8.1; see Chapter 7 of the 2010 edition);

h) The re-inspection rules are changed (see 8.3.1; see 7.3.1 of the 2010 version);

i) The supplementary requirements for steel plates, specimen preparation and type are deleted (see Appendix A and Appendix B of the 2010 edition).

1 Scope

This document specifies the grade expression method, technical requirements, sample and specimen preparation, test methods, and inspection rules for steel plates with through-thickness properties.

This document applies to killed steel plates with a thickness of 15 mm~400 mm.

2 Normative references

The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document.

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

GB/T 2970 Method for ultrasonic testing of thicker steel plates

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

3 Terms and definitions

The following terms and definitions apply to this document.

4 Grade expression method

The grade of steel plate with through-thickness properties consists of the original grade of the product and the level of through-thickness properties (Z15, Z25, or Z35).

5 Technical requirements

5.1 The sulfur content (smelting analysis) of steel corresponding to different through- thickness property levels shall comply with the provisions of Table 1.

5.2 The level of through-thickness properties of the steel plate, the corresponding average value of reduction of area, and the minimum value of a single specimen shall comply with the provisions of Table 2.

5.3 Steel plates with through-thickness properties shall be subjected to ultrasonic flaw detection. Unless otherwise specified, ultrasonic flaw detection shall be carried out in accordance with GB/T 2970, and the result shall meet the requirements of quality level III.

6 Sample and specimen preparation

7 Test methods

The tensile test in thickness direction shall be conducted in accordance with GB/T 228.1, and the reduction of area shall be determined in accordance with GB/T 228.1. The reduction of area is calculated according to formula (1), formula (2), and formula (3).

8 Inspection rules