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GB/T 20887.2-2022 (GB/T20887.2-2022, GBT 20887.2-2022, GBT20887.2-2022) & related versions
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GB/T 20887.2-2022English185 Add to Cart 0-9 seconds. Auto delivery. Continuously hot rolled high strength steel sheet and strip for automobile -- Part 2: High hole expansion steel GB/T 20887.2-2022 Valid GBT 20887.2-2022
GB/T 20887.2-2010English95 Add to Cart 0-9 seconds. Auto delivery. Continuously hot rolled high strength steel sheet and strip for automobile -- Part 2: High hole expansion steel GB/T 20887.2-2010 Obsolete GBT 20887.2-2010



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GB/T 20887.2-2022: PDF in English (GBT 20887.2-2022)
GB/T 20887.2-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 20887.2-2010
Continuously hot rolled high strength steel sheet and strip
for automobile - Part 2: High hole expansion steel
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
Introduction ... 5 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 9 
4 Classification and designation representation method ... 10 
5 Order content ... 10 
6 Dimension, shape, weight ... 11 
7 Technical requirements ... 11 
8 Test methods ... 14 
9 Inspection rules ... 15 
10 Package, mark and certification ... 15 
Appendix A (Informative) Comparison of similar designations at home and abroad . 16 
Bibliography ... 17 
Continuously hot rolled high strength steel sheet and strip
for automobile - Part 2: High hole expansion steel
1 Scope
This document specifies the terms and definitions, classification and designation
representation method, order content, dimension, shape, weight, technical requirements,
test methods, inspection rules, package, mark and certification of continuously hot
rolled high-strength high hole expansion steel sheet and strip for automobile.
This document applies to continuously hot rolled steel strips with high hole expansion
property with a thickness of not more than 6.0 mm, steel sheets cross-cut from them,
and longitudinally-cut steel strips (hereinafter referred to as "steel sheets and strips").
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrome
azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium 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
- Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain
hardening exponent
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 18253-2018 Steel and steel products - Types of inspection documents
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content -
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
GB/T 24524 Metallic materials - Sheet and strip - Hole expanding test
GB/T 38813 General requirements for hot-rolled pickled steel sheet and strip
3 Terms and definitions
The following term and definition applies to this document.
3.1
High hole expansion steel; HE
A steel whose microstructure is mainly "ferrite + bainite" or ferrite (or strengthened
ferrite) or bainite (or strengthened bainite), etc.
Note: High hole expansion steel has high tensile strength, high formability, and good flange flanging
formability. High hole expansion steel is also sometimes referred to as ferritic-bainitic steel
(FB) or high flange flanging high-strength steel (SF).
4 Classification and designation representation method
4.1 Classification
4.1.1 According to the surface state, steel sheets and strips are classified into:
a) Hot rolled surface;
b) Hot rolled pickled surface. When the surface state is hot rolled pickled surface, it
is represented by the code "P".
4.1.2 According to the surface quality, steel sheets and strips are classified into:
a) Ordinary surface (FA);
b) Relatively-advanced surface (FB).
4.2 Designation representation method
The designation of the steel sheets and strips is composed of three parts: The initials
"HR" of the English "Hot Rolled"; the specified minimum yield strength value/the
specified minimum tensile strength value; the initials "HE" of the English "Hole
Expansion".
Example: HR440/580HE
HR - The initials of the English "Hot Rolled";
440/580 - 440 is the specified minimum yield strength value; 580 is the specified minimum tensile
strength value; in megapascals (MPa);
HE - The initials of the English "Hole Expansion".
5 Order content
5.1 Contracts or orders placed according to this document shall include the following:
a) Product name (steel sheet or strip);
b) Number of this document;
c) Designation;
d) Specification and dimension, roughness accuracy;
e) Surface state (Pickled surface is represented by the code "P");
9 Inspection rules
9.1 The inspection and acceptance of steel sheets and strips shall be carried out by the
quality inspection department of the supplier.
9.2 Steel sheets and strips shall be accepted in lots. Each lot shall consist of steel sheets
or strips of the same designation, heat number, thickness and rolling system with a
weight not greater than 60 t. Steel strips and continuously rolled steel sheets with a
rolled coil weight greater than 30 t can be batched into two rolled coils.
9.3 The sampling quantity and sampling methods of steel sheets and strips shall comply
with the provisions of Table 4.
9.4 The re-inspection and determination rules for steel sheets and strips shall comply
with the provisions of GB/T 17505.
9.5 The test results of chemical composition and mechanical properties are rounded
according to the rounding value comparison method. The rules of rounding off shall be
in accordance with the provisions of GB/T 8170.
10 Package, mark and certification
The package, mark and certification of steel sheets and strips shall comply with the
provisions of GB/T 247. The type of certification (inspection document) shall comply
with the provisions in GB/T 18253-2018. When the inspection document type is not
specified, it shall be in accordance with Type 3.1 of GB/T 18253-2018.
......

BASIC DATA
Standard ID GB/T 20887.2-2022 (GB/T20887.2-2022)
Description (Translated English) Continuously hot rolled high strength steel sheet and strip for automobile -- Part 2: High hole expansion steel
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H46
Classification of International Standard 77.140.50
Word Count Estimation 10,155
Date of Issue 2022-04-15
Date of Implementation 2022-11-01
Older Standard (superseded by this standard) GB/T 20887.2-2010
Quoted Standard GB/T 222; GB/T 223.5; GB/T 223.9; GB/T 223.12; GB/T 223.23; GB/T 223.26; GB/T 223.40; GB/T 223.54; GB/T 223.59; GB/T 223.60; GB/T 223.63; GB/T 223.64; GB/T 223.76; GB/T 223.78; GB/T 223.84; GB/T 223.85; GB/T 223.86; GB/T 228.1; GB/T 247; GB/T 709
Drafting Organization Baoshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Research Institute, Bengang Steel Plate Co., Ltd., Anyang Iron and Steel Co., Ltd., Shougang Group Co., Ltd., Hegang Co., Ltd. Handan Branch, Beijing University of Science and Technology
Administrative Organization National Steel Standardization Technical Committee (SAC/TC 183)
Proposing organization China Iron and Steel Association
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration
Summary This standard specifies the terms and definitions, classification and designation method, order content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate. This standard applies to hot continuous-rolled steel strips with a thickness of not more than 6.0 mm with high hole-expanding performance, and the steel plates and longitudinally cut steel strips cut therefrom (hereinafter referred to as "steel plates and steel strips").