GB/T 20564.2-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20564.2-2017 | English | 120 |
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Continuously Cold Rolled High Strength Steel Sheet and Strip for Automobile - Part 2: Dual Phase Steel
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| GB/T 20564.2-2006 | English | 319 |
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Continuously cold rolled high strength steel sheet and strip for automobile -- Part 2: Dual phase steel
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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
---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/GBT20564.2-2017
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.
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);
--- Added the description of the guarantee period for mechanical properties (see
7.4.1 of this Edition);
--- Added the provisions of mechanical properties when supplying products as per
the specified parts (see 7.4.3 of this Edition);
--- Added three grades of CR500/780DP, CR700/980DP, CR820/1180DP (see Table
4 of this Edition);
--- Modified the mechanical properties indications of each grade (see Table 4 of this
Edition; Table 3 of 2006 Edition);
--- Added the requirements for tensile test methods (see 8.3 of this Edition).
This Part was proposed by China Iron and Steel 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 & Steel Co., Ltd., China Metallurgical
Information and Standardization Institute, Bengang (Group) Co., Ltd., Shougang
Corporation, Xinyu Iron & Steel Co., Ltd., Angang Steel Co., Ltd., and Handan Iron and
Steel Group Co., Ltd.
Chief drafting staffs of this Part. Zhu Yan, Zhang Weixu, Hu Ling, Sun Zhongming,
Zheng Jianping, Xu Ming, Kuang Shuang, Peng Chong, Wang Keqiang, Guo Rongxiu,
Tu Shulin, Li Qian, Gao Honggang, Tang Mu, Li Shengyan, Su Haolu, Zhang Zhanjie,
and Huang Jinhua.
The historical edition replaced by this Standard is as follows.
--- GB/T 20564.2-2006.
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
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Dual Phase Steel. DP
The steel microstructure is mainly the ferrite and martensite, there is also small part of
bainite.
4 Classification and Grade Expression Method
4.1 Classification
4.1.1 The usage and classification of steel sheet and strip can refer to Table 1.
4.2 Grade expression method
The grade of steel sheet and strip consists of three parts, namely, the initials of “Cold
Rolled”, specified minimum yield strength value/ specified minimum tensile strength
value, and initials of “Dual Phase”.
5 Ordering Content
5.1 The ordering contract or ordering list shall contain the following contents as per
this Part.
5.2 If the dimension and roughness accuracy, surface quality level, surface structure
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.
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
7.4 Mechanical properties
7.4.1 The supplier shall guarantee the mechanical properties of steel sheet and plate
conform to the provisions of Table 4 within 6 months since the manufacture completion
date.
7.5 Welding
The users can determine the appropriate welding process based on the chemical
compositions and strength level; if necessary, they can also consult the manufacturer.
7.6 Surface quality
7.6.1 The surface of steel sheet and strip shall be exempted from the scars, cracks,
inclusions, and the like defects that may be harmful for the use; the steel sheet and
strip shall not have the lamination.
7.6.2 The quality of each surface of steel sheet and strip shall conform to the
provisions of Table 5.
7.7 Surface structure
The surface structure of steel sheet and strip shall conform to the provisions of Table
6.If the purchaser has special requirements on roughness, it shall be negotiated when
ordering.
8 Test Methods
8.1 The analysis method of steel chemical compositions shall be performed as per
the provisions of GB/T 223.4, GB/T 223.5, GB/T 223.9, GB/T 223.12, GB/T 223.26,
GB/T 223.59, GB/T 223.64, GB/T 223.78, GB/T 223.86, GB/T 4336, GB/T 20123, GB/T
20125, GB/T 20126 or general method; but the arbitration shall be performed as per
the provisions of GB/T 223.4, GB/T 223.5, GB/T 223.9, GB/T 223.12, GB/T 223.26,
GB/T 223.59, GB/T 223.64, GB/T 223.78.
8.2 The inspection items and test methods of steel sheet and strip shall conform to
the provisions of Table 7.
9 Inspection Rules
9.1 The inspection and acceptance of steel sheet and strip shall be performed by the
Inspection Department of the supplier.
9.2 The steel sheet and strip shall be inspected in batch; each batch consists of the
steel sheet and strip with the same grade, the same specification, and the same
processing state.
9.3 The sampling quantity and sampling method of steel sheet and strip shall conform
to the provisions of Table 7.
9.4 The re-inspection and judgment rules of steel sheet and strip shall conform to the
provisions of GB/T 17505.
10 Package, Marking and Quality Certificate
The package, marking and quality certificate of steel sheet and strip shall conform to
the provisions of GB/T 247; if the purchaser has special package requirements, it shall
be negotiated when ordering.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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