GB/T 20564.2-2017 English PDF (GBT20564.2-2017)

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GB/T 20564.2-2017: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 2: Dual phase steel
GB/T 20564.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 20564.2-2006
Continuously Cold Rolled High
Strength Steel Sheet and Strip for
Automobile – Part 2. Dual Phase Steel
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
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 ... 5
2 Normative References ... 5
3 Terms and Definitions ... 7
4 Classification and Grade Expression Method ... 7
5 Ordering Content ... 8
6 Dimension, Shape and Weight ... 9
7 Technical Requirements ... 9
8 Test Methods ... 11
9 Inspection Rules ... 12
10 Package, Marking and Quality Certificate ... 12
Appendix A (Informative) Chemical Compositions of Steel ... 14
Appendix B (Informative) Approximate Comparison between National and
International Grades ... 15
Foreword
GB/T 20564 Continuously Cold Rolled High Strength Steel Sheet and Strip can be
divided into the following 11 parts.
--- Part 1. Brake Hardening Steel;
--- Part 2. Dual Phase Steel;
--- Part 3. High Strength Interstitial Free Steel;
--- Part 4. High Strength Low Alloy Steel;
--- Part 5. Isotropic Steel;
--- Part 6. Transformation Induced Plasticity Steel;
--- Part 7. Martensitic Steel;
--- Part 8. Complex Phase Steel;
--- Part 9. Quenching and Partitioning Steel;
--- Part 10. Twinning Induced Plasticity Steel;
--- Part 11. Carbon Manganese Steel.
This Part belongs to Part 2 of GB/T 20564.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 20564.2-2006 Continuously Cold Rolled High Strength Steel
Sheet and Strip – Part 2. Dual Phase Steel. Compared with GB/T 20564.2-2006, this
Part has the major technical changes as follows.
--- Modified the nominal thickness range (see Clause 1 of this Edition; Clause 1 of
2006 Edition);
--- Modified the definition of dual phase steel (see 3.1 of this Edition; 3.1 of 2006
Edition);
--- Added the usage classification of steel sheet and strip (see 4.2 of this Edition);
--- Deleted the quality requirements for the super-high grade of surface (see 4.2 of
2006 Edition);
--- Added the risk warnings for non-oiled products and regulations on production
completion date (see 7.3.2 of this Edition);
Continuously Cold Rolled High
Strength Steel Sheet and Strip for
Automobile – Part 2. Dual Phase Steel
1 Scope
This Part of GB/T 20564 specifies the terms and definitions, classification and grade
expression method, ordering content, dimension, shape, weight, technical
requirements, test methods, inspection rules, package, marking and quality certificate
of cold rolled high strength dual phase steel sheet and strip.
This Part is applicable to the steel sheet and strip with thickness of 0.50mm~3.00mm
for manufacturing automotive structural parts, reinforcement parts and some internal
and external plates (hereinafter referred to as “steel sheet and 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 223.4 Iron, Steel and Alloy – Determination of Manganese Content –
Potentiometric or Visual Titration Method
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 - Chrom
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 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
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 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
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 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Sheet and Strip
GB/T 708 Dimension, Shape, Weight, and Tolerance for Cold-Rolled Steel Plate
GB/T 2523 Measuring Method of Surface Roughness and Peak Count for Cold-
Rolled Metal Sheet (Strip)
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 5028 Metallic Materials - Sheet and Strip - Determination of Tensile Strain
Hardening Exponent (N-Values)
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
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 20126 Unalloyed Steel - Determination of Low Carbon Content - Part 2.
Infrared Absorption Method after Combustion in an Induction Furnace (with
type, edge state, package and the like information are not indicated in the ordering
contract; then the products in this Part shall be delivered as per the ordinary dimension
and roughness accuracy, relative high-level surface, pitted surface structure and
cutting edge state; and packaged as per the packaging mode provided by the supplier.
6 Dimension, Shape and Weight
The dimension, shape, weight and allowable deviation of steel sheet and strip shall
conform to the provisions of GB/T 708.
7 Technical Requirements
7.1 Chemical compositions
The reference values of chemical compositions (melting analysis) of steel can refer to
Appendix A. If the purchaser has the demand for the chemical compositions, it shall
be negotiated when ordering. The approximate comparison between the national and
international standard grades can refer to Appendix B.
7.2 Smelting method
The steel for steel sheet and strip be smelted by oxygen converter or electric furnace;
unless otherwise is specified, the smelting mode shall be selected by the supplier.
7.3 Delivery state
7.3.1 Generally, the steel sheet and strip shall be delivered in a flattened state after
annealing and ca...