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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 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 20887.1: Historical versions
Similar standardsGB/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 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/GBT20887.1-2017 GB NATIONAL STANDARD OF THE PEOPLE’S 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 ContentsForeword... 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... 14ForewordGB/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 & Steel Co., Ltd., Shougang Corporation, Bengang Group Co., Ltd., China Metallurgical Information and Standardization Institute, and Angang Steel Company Limited. Chief drafting staffs of this Part. Huang Jinhua, Zhang Weixu, Zhu Yan, Tu Shulin, Lu Min, Wu Chaohui, Zhang Xianfeng, Guan Jichun, Hu Ling, Shi Li, Huang Jianguo, Li Qian, Sun Zhongming, and Li Heishan. The historical edition replaced by this Standard is as follows. --- GB/T 20887.1-2007. Continuously Hot Rolled High Strength Steel Sheet and Strip for Automobile – Part 1.High Yield Strength Steel for Cold Forming1 ScopeThis 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 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 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 Content3 Classification and Grade Expression Method3.1 Classification 3.2 Grade expression method The grade of steel sheet and strip consists of three parts like initial of “Hot Rolled” of “HR”, specified minimum yield strength value, initial of “Forming” of “F”. Example. HR315F4 Ordering Contents4.1 The contract or purchasing list ordering products as per this Part shall include the following contents. 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.5 Dimension, Appearance, WeightThe dimension, appearance, weight and permissible tolerance of steel sheet and strip shall conform to the provisions of GB/T 709.6 Technical Requirements6.1 Grade and chemical compositions 6.2 Smelting method The steel used for steel sheet and strip shall be smelted by oxygen converter or electric furnace; unless otherwise specified, the smelting method shall be selected by the supplier. 6.3 Delivery state 6.3.1 Generally, the steel sheet and strip shall be delivered in hot rolled state. 6.4 Mechanical and process properties Grade 6.5 Surface quality 6.5.1 The surface of steel sheet and strip shall be free of defects that are harmful to use, such as scars, cracks, inclusions, etc.; steel sheet and strip shall have no delamination. 6.5.2 The surface quality of steel sheet and strip shall conform to the provisions of Grade 6.6 Special requirements According to the requirements of the purchaser, through the negotiation between the supplier and the purchaser, indicated in the contract, the Charpy (V-notch) impact test, grain size and non-metallic inclusion inspection can be supplemented.7 Test Methods7.1 The analysis method for the chemical compositions of steel shall be performed as per the provisions of GB/T 223.5, GB/T 223.9, GB/T 223.17, GB/T 223.26, GB/T 223.40, GB/T 223.58, GB/T 223.59, GB/T 223.67, GB/T 223.76, GB/T 223.78, GB/T 223.86, GB/T 4336, GB/T 20123, GB/T 20125, GB/T 20126 or general method; while the arbitration shall be performed as per the provisions of GB/T 223.5, GB/T 223.9, GB/T 223.17, GB/T 223.26, GB/T 223.40, GB/T 223.58, GB/T 223.59, GB/T 223.67, GB/T 223.76, GB/T 223.78, GB/T 223.86. 7.2 The inspection items and test methods of steel sheet and strip shall conform to the provisions of Table 4.8 Inspection Rules8.1 The inspection and acceptance of steel sheet and strip shall be performed by the supplier’s Inspection department. 8.2 The steel sheet and strip shall be accepted in batches. Each batch consists of the steel sheet and strip with the same grade, the same furnace number, the same thickness, and the same rolling mechanism. 8.3 The sampling quantities and sampling methods of steel sheet and strip shall conform to the provisions of Table 4. 8.4 The reinspection and judgement rules of steel sheet and strip shall conform to the provisions of GB/T 17505.9 Package, Mark and Quality CertificateThe package, mark and quality certificate of steel sheet and strip shall conform to the provisions of GB/T 247.Appendix A(Informative) Approximate Comparison between Domestic and Foreign Grades The approximate comparison of grades in this Part and in international standards can refer to Table A.1.Appendix B(Informative) Minimum Bend Radius Recommended for Cold Forming The minimum bend radius recommended for cold forming can refer to Table B.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
