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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 Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20564.2: Historical versions
Similar standardsGB/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 ContentsForeword... 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... 15ForewordGB/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 Steel1 ScopeThis 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 ReferencesThe 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 Method3 Terms and DefinitionsThe 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 Method4.1 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 Content5.1 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 WeightThe dimension, shape, weight and allowable deviation of steel sheet and strip shall conform to the provisions of GB/T 708.7 Technical Requirements7.1 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 Methods8.1 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 Rules9.1 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 CertificateThe 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. |
