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
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31922-2015
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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