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GB/T 20887.1-2007 English PDF (GBT20887.1-2007)

GB/T 20887.1-2007 English PDF (GBT20887.1-2007)

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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

This Part specifies the classification and code, dimension, shape, weight, technical requirements, inspection and test, package, marking and quality certificate of continuously hot rolled high yield strength steel sheet and strip for cold forming.
GB/T 20887.1-2007
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously Hot Rolled High Strength Steel Sheet
and Strip for Automobile ?€? Part 1.
High Yield Strength Steel for Cold Forming
ISSUED ON. MARCH 9, 2007
IMPLEMENTED ON. OCTOBER 1, 2007
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification and Code ... 6
4 Information Required by Ordering ... 7
5 Size, Shape, Weight and Permissible Deviation ... 7
6 Technical Requirements ... 8
7 Inspection and Test ... 11
8 Package, Marking and Quality Certificate ... 12
9 Rounding off for Values ... 12
10 Approximate Control between Domestic and Foreign Grades ... 12
Appendix A (Informative) Approximate Control between Domestic and Foreign Grades ... 13
Foreword
GB/T 20887 Continuously Hot Rolled High Strength Steel Sheet and Strip for Automotive can be divided into 5 parts.
--- Part 1. High Yield Strength Steel for Cold Forming;
--- Part 2. High Hole Expansion Steel1);
--- Part 3. Dual Phase Steel1);
--- Part 4. Transformation Induced Plasticity Steel1);
--- Part 5. Martensitic Steel1).
This Part belongs to Part 1 of GB/T 20887 Continuously Hot Rolled High Strength Steel Sheet and Strip for Automotive.
The consistence between this Part and EN10149-2.1985 Hot Rolled Flat Products Made of High Yield Strength Steels for Cold Forming ?€? Part 2. Delivery Conditions for Thermomechanically Rolled Steels is inequivalent.
The Appendix A of this Part is the informative one.
This Part was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steel.
Drafting organizations of this Part. Baoshan Iron and Steel Co., Ltd.
Chief drafting staffs of this Part. Huang Jinhua, Shi Hongyan, Tu Shulin, Sun Zhongming, Xu Hongwei, and Yu Chengfeng.
1) It is proposed to be prepared.
Continuously Hot Rolled High Strength Steel Sheet
and Strip for Automobile ?€? Part 1.
High Yield Strength Steel for Cold Forming
1 Scope
This Part specifies the classification and code, dimension, shape, weight, technical requirements, inspection and test, package, marking and quality certificate of continuously hot rolled high yield strength steel sheet and strip for cold forming. This Part is applicable to no-greater-than-20mm-thick continuously hot rolled high yield strength steel strip, and the steel sheet horizontally cut by the steel strip, as well as the steel strip longitudinally cut by the steel strip, hereinafter referred to as steel sheet and strip.
2 Normative References
The provisions in following documents become the provisions of this Part through reference in this Part. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.9 Iron, Steel and Alloy - The Chrome Azurol S Photometric Method for the Determination of Aluminium Content
GB/T 223.10 Iron, Steel and Alloy - The Cupferron Separation ?€? The Chrome Azurol S Photometric Method for the Determination of Aluminium Content
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 223.17 Method for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.26 Method for Chemical Analysis of Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method
GB/T 223.40 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion- Exchange Separation - Sulphochlorophenol S Photometric Method for the
Determination of Niobium Content
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content
GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Sodium Arsenite ?€? Sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59 Methods for Chemical Analysis of Iron, Steel and Alloy -
Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue
Spectrophotometric Method and Antimony Phosphomolybdate Blue
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 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl Acetate Extraction Photometric Method for the Determination of Phosphorus 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 223.64 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrometric Method for the Determination of Manganese Content
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 223.76-1994, eqv ISO 9647.1989)
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin Spectrophotometric Method for the Determination of Boron Content
GB/T 228 Metallic Materials ?€? Tensile Testing at Ambient Temperature (GB/T 228- 2002, eqv ISO 6892.1998)
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232 Metallic Materials ?€? Bend Test (GB/T 232-1999, eqv ISO 7438.1985) GB/T 247 General Rule of Acceptance, 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 2975-1998, eqv ISO 377.1997)
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
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404.1992)
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition (GB/T 20066-2006, ISO 14284.1996, IDT) ASTM E 1019 Methods for Analysis of Carbon, Sulfur, Nitrogen and Oxygen in Nickel-Based and Cobalt-Based Alloys, Iron and Steel.
3 Classification and Code
3.1 Naming method of the grade
The steel grade consists of three parts, namely, initial letters of ?€?HR?€? in English ?€?Hot Rolled?€?, specified smallest yield strength value, and initial letter of ?€?F?€? in English ?€?Forming?€?.
Example. HR315F
6 Technical Requirements
6.1 Chemical compositions
6.1.1 The steel chemical compositions (smelting analysis) shall conform to the provisions of Table 1. The permissible deviation of chemical compositions of finished steel products shall conform to the provisions of GB/T 222.
6.1.2 The contents of residual elements of copper, chromium, nickel in steel shall be no greater than 0.30%, respectively; if the supplier can guarantee the above provision, analysis can be ignored.
6.2 Smelting method
The steel sheet and strip used steel is smelted by oxygen converter or electric furnace. Unless otherwise specified, the smelting method is selected by the supplier. 6.3 Delivery state
6.3.1 Steel sheet and strip are delivered in the hot rolled state.
6.3.2 When steel sheet and strip have hot rolled pickled surface, generally they shall be delivered in the oil painting state; the painted oil film can be removed by the alkaline solution; in the general package, transportation, loading and unloading, and storage conditions, the supplier shall guarantee no rust within 3 months since they were...

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