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GB/T 31922-2015 PDF English

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GB/T 31922-2015: Hot-rolled steel sheets and strips of higher yield strength with improved formability
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GB/T 31922-2015: Hot-rolled steel sheets and strips of higher yield strength with improved formability


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GB ICS 77.140.50 H 46 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Hot-rolled steel sheets and strips of higher yield strength with improved formability (ISO 5951.2013, Hot-rolled steel sheet of higher yield strength with improved formability, MOD) Issued on: SEPTEMBER 11, 2015 Implemented on: JUNE 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Classification and code ... 7 4 Required ordering information ... 8 5 Dimension, shape, weight and allowable deviation ... 8 6 Technical requirements ... 8 7 Test methods ... 11 8 Inspection rules ... 12 9 Packaging, marks and quality certificate ... 12 10 Rounding off for numerical values ... 12 Appendix A (Informative) Structural changes of this Standard compared with the ISO 5951.2013 ... 13 Appendix B (Informative) List of the corresponding technical differences between this Standard and ISO 5951.2013 and the causes ... 14

Foreword

This Standard is drafted according to the rules given in the GB/T 1.1-2009. This Standard uses redrafting method to modify ISO 5951.2013 (E) Hot-rolled steel sheet of higher yield strength with improved formability. Compared with ISO 5951.2013, this Standard makes many adjustments in structure. Clause numbers of this Standard and ISO 5951.2013 are listed in the control list in Appendix A. There are technical differences between this Standard and ISO 5951.2013. The clauses involved in these differences have been indicated via the vertical single lines (|) drawn at the outer margin positions. The list of corresponding technical differences and causes is given in Appendix B. This Standard makes the following editorial modifications. — DELETE the contents in the table of contents, references and foreword of the ISO 5951.2013. REWRITE the foreword in accordance with the standard practice of our country. — MODIFY the word “this International Standard” to “this Standard” or “this document”. — In the normative references, this Standard makes direct reference to the corresponding national standards. — USE the decimal point “.” to replace the comma “,” used as decimal point. — According to the expression in our national standards, RE-INDUCE the expression on the required ordering information, dimension, shape, weight, allowable deviation, delivery status, oiling, test methods, surface quality and inspection rules. — Clearly REQUEST to use the upper yield strength ReH as minimum yield strength. — ADD Appendix A (Informative) “Structural changes of this Standard compared with the ISO 5951.2013”. — ADD Appendix B (Informative) “List of the corresponding technical differences between this Standard and ISO 5951.2013 and the causes”. This Standard was proposed by China Iron and Steel Association. Hot-rolled steel sheets and strips of higher yield strength with improved formability

1 Scope

This Standard specifies the classification and code, ordering information, dimension, shape, weight, allowable deviation, technical requirements, test methods, inspection rules, packaging, marks and quality certificate of the hot- rolled steel sheets and strips of higher yield strength with improved formability. This Standard is applicable to the hot-rolled steel strips of higher yield strength with good formability and the thickness of 1.0mm to 6.0mm, the steel sheets produced by the crosscutting of steel strips, and the steel strips produced by rip cutting (hereinafter referred to as “steel sheets and strips”).

2 Normative references

The following documents are essential to the application of this document. For dated references, only the versions with the dates indicated are applicable to this document. For undated references, only the latest versions (including all the amendments) are applicable to this document. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223.3 Methods for chemical analysis of iron, steel and alloy – The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.9 Iron, steel and alloy – Determination of aluminium content – Chrom azurol S photometric method GB/T 223.11 Iron, steel and alloy – Determination of chromium content – Visual titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937.1986, MOD) GB/T 223.14 Methods for chemical analysis of iron, steel and alloy – The N- Benzoy-N-Phenylhydroxylamine extraction photometric method for the determination of vanadium content GB/T 223.17 Methods for chemical analysis of iron, steel and alloy – The diantipyrylmethane photometric method for the determination of titanium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy – The sodium thiosulfate separation iodimetric method for the determination of copper content GB/T 223.23 Iron, steel and alloy – Determination of nickel content – The dimethylglyoxime spectrophotometric method GB/T 223.26 Iron, steel and alloy – Determination of molybdenum content – The thiocyanate spectrophotometric method GB/T 223.40 Iron, steel and alloy – Determination of niobium content by the sulphochlorophenol S spectrophotometric method GB/T 223.60 Methods for chemical analysis of iron, steel and alloy – The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.63 Methods for chemical analysis of iron, steel and alloy – The sodium (potassium) periodate photometric method for the determination of manganese content GB/T 223.68 Methods for chemical analysis of iron, steel and alloy – The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content GB/T 223.69 Iron, steel and alloy – Determination of carbon contents – Gas- volumetric method after combustion in the pipe furnace GB/T 223.75 Iron, steel and alloy – Determination of boron content – Methanol distillation-curcumin photometric method GB/T 223.76 Methods for chemical analysis of iron, steel and alloy – The flame atomic absorption spectrometric method for the determination of vanadium content GB/T 228.1 Metallic materials – Tensile testing – Part 1. Method of test at room temperature (GB/T 228.1-2010, ISO 6892-1.2009, MOD) GB/T 247 General rule of package mark and certification for steel plates (sheets) and strips GB/T 709 Dimension, shape, weight and tolerances for hot-rolled steel sheets and strips (GB/T 709-2006, ISO 7452.2002, ISO 16160.2000, NEQ)

4 Required ordering information

4.1 During ordering, the requisitioning party shall provide the following information. a) Standard No.; b) product name (steel sheet or strip); c) designation; d) specifications, dimension and roughness precision; e) weight; f) edge status (EC or EM); g) surface status; and h) special requirements. 4.2 If the information (such as dimension precision, surface status, etc.) is not specified in the order contract, SUPPLY the goods with general precision and hot-rolled surfaces. When delivering the goods with pickled surfaces, if not indicating whether to oil the goods, DELIVER the goods with oil coatings.

5 Dimension, shape, weight and allowable deviation

The dimension, shape, weight and allowable deviation of steel sheets and strips shall conform to the provisions in the GB/T 709.

6 Technical requirements

6.1 Chemical composition 6.1.1 For all designations of steel, the chemical composition (heat analysis) shall conform to the requirements in Table 1. 6.1.2 The inclusions containing the elemental sulfur may have a certain influence on the cold forming properties of the products. Therefore, manufacturers may add appropriate elements, such as Ce or Ca, to improve the shape of sulfide, or may choose a very low sulfur content for these steels. 6.5.4 In the rolling process of steel strips, it is allowed to generate cross breaks. When using the steel strips as cold forming materials, users shall use the steel strips after the leveling process. Table 3 Grade and code Applicable surface processing mode Characteristic Ordinary quality surface (FA) Rolled surface Pickled surface It is allowed to have minor and local defects whose depths (or heights) do not exceed half of the thickness tolerances of steel sheets on the surfaces, such as pitting, concaves, scratches, etc. However, ENSURE the allowable minimum thickness of the steel sheets and strips. Higher quality surface (FB) Pickled surface It is allowed to have the defects not affecting the formability on the surfaces, such as minor scratches, minor indentations, minor pitting, minor roll marks, chr... ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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