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GB/T 20887.1-2017 English PDF (GBT20887.1-2017)

GB/T 20887.1-2017 English PDF (GBT20887.1-2017)

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GB/T 20887.1-2017: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 1: High yield strength steel for cold forming

This Part of GB/T 20887 specifies the classification and grade expression method, ordering contents, dimension, appearance, weight, technical requirements, test methods, inspection rules, package, mark and quality certificate of hot rolled high yield strength steel sheet and strip for cold forming.
GB/T 20887.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 20887.1-2007
Continuously Hot Rolled High Strength
Steel Sheet and Strip for Automobile ?€?
Part 1. High Yield Strength Steel for Cold Forming
ISSUED ON. SEPTEMBER 07, 2017
IMPLEMENTED ON. JUNE 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword . 3
1 Scope .. 5
2 Normative References . 5
3 Classification and Grade Expression Method .. 7
4 Ordering Contents . 8
5 Dimension, Appearance, Weight . 8
6 Technical Requirements .. 8
7 Test Methods . 11
8 Inspection Rules . 12
9 Package, Mark and Quality Certificate . 12
Appendix A (Informative) Approximate Comparison between Domestic and
Foreign Grades .. 13
Appendix B (Informative) Minimum Bend Radius Recommended for Cold
Forming . 14
Foreword
GB/T 20887 Continuously Hot Rolled High Strength Steel Sheet and Strip for Automobile can be divided into 7 parts.
--- Part 1. High Yield Strength Steel for Cold Forming;
--- Part 2. High Hole Expansion Steel;
--- Part 3. Dual Phase Steel;
--- Part 4. Transformation Induced Plasticity Steel;
--- Part 5. Martensitic Steel;
--- Part 6. Complex Phase Steel;
--- Part 7. Steels for Hydraulic Forming.
This Part belongs to Part 1 of GB/T 20887.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part Replaced GB/T 20887.1-2007 Continuously Hot Rolled High Strength Steel Sheet and Strip for Automobile ?€? Part 1. High Yield Strength Steel for Cold Forming. Compared with GB/T 20887.1-2007, this Part has the major technical changes as follows.
--- Increase two grades of HR900F, HR960F; and their corresponding technical requirements (see Table 1, Table 2 of this Edition);
--- Delete the provisions of residual elements (see 6.1.1 of Edition 2007); --- Modify batch weight from 40t to 60t (see 8.2 of this Edition; 7.5 of Edition 2007); --- Add the provisions of inspection document type (see Clause 9 of this Edition); --- Add the informative Appendix B (see Appendix B of this Edition).
This Part was proposed by China Iron and Steel Industry Association.
This Part shall be under the jurisdiction of National Technical Committee for Standardization of Steel (SAC/TC 183).
Drafting organizations of this Part. Baoshan Iron and Steel Co., Ltd., Shougang Corporation, Bengang Group Co., Ltd., China Metallurgical Information and Standardization Institute, and Angang Steel Company Limited.
Continuously Hot Rolled High Strength
Steel Sheet and Strip for Automobile ?€?
Part 1. High Yield Strength Steel for Cold Forming
1 Scope
This Part of GB/T 20887 specifies the classification and grade expression method, ordering contents, dimension, appearance, weight, technical requirements, test methods, inspection rules, package, mark and quality certificate of hot rolled high yield strength steel sheet and strip for cold forming.
This Part is applicable to continuously hot rolled high yield strength steel strip for cold forming, and transversely-cut steel sheet and longitudinally-cut steel strip (hereinafter referred to as ?€?steel sheet and strip?€?) made by the above steel strip.
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 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 Aluminum Content - Chrom Azurol S Photometric Method
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 223.26 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 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - The Extraction-Absorption Catalytic Polarographic Method for the Determination of Manganese Content
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene Blue Spectrophotometric Method
GB/T 223.76 Methods for Chemical Analysis if Iron, Steel and Alloy - The Flame Atomic Absorption Spectrometric Method for the Determination of Vanadium Content
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin Spectrophotometric Method for the Determination of Boron Content
GB/T 223.86 Steel and Iron?€?Determination of Total Carbon Content?€?Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room Temperature
GB/T 229 Metallic Materials - Charpy Notch Impact Test
GB/T 232 Metallic Materials ?€? Bend Test
GB/T 247 General Rule of Package Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel Sheets and Strips
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel ?€? Determination of Multi-Element
Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
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 - 4 Ordering Contents
4.1 The contract or purchasing list ordering products as per this Part shall include the following contents.
a) Product name (steel sheet or strip);
b) This Part number;
c) Grade;
d) Specification and dimension, roughness accuracy;
e) Surface state (when it is pickled surface, expressed by Code ?€?P?€?);
f) Surface quality level;
g) Edge state;
h) Packaging mode;
i) Weight;
j) Other special requirements.
4.2 If the ordering contact doesn?€?t specify the surface state, thickness accuracy, etc.; then the products shall be supplied as per hot rolled surface, ordinary thickness accuracy. When it is the hot rolled pickled surface, if the surface quality level and oil use have not been specified, the products shall be delivered as per the oiled relative- high surface (FB).
5 Dimension, Appearance, Weight
The dimension, appearance, weight and permissible tolerance of steel sheet and strip shall conform to the provisions of GB/T 709.
6 Technical Requirements
6.1 Grade and chemical compositions
6.1.1 The grade and chemical compositions (smelting analysis) of steel shall conform to the provisions of Table 1. Approximate comparison between domestic and foreign standard grades can refer to Appendix A.

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