GB/T 20564.7-2022 PDF EnglishUS$260.00 · In stock · Download in 9 seconds
GB/T 20564.7-2022: Continuously cold rolled high strength steel sheet and strip for automobile - Part 7: Martensitic 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 20564.7: Historical versions
Similar standardsGB/T 20564.7-2022: Continuously cold rolled high strength steel sheet and strip for automobile - Part 7: Martensitic 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/GBT20564.7-2022 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 CCS H 46 Replacing GB/T 20564.7-2010 Continuously cold rolled high strength steel sheet and strip for automobile - Part 7.Martensitic steel Issued on. APRIL 15, 2022 Implemented on. NOVEMBER 01, 2022 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 9 4 Classification and designation representation method... 9 5 Order content... 10 6 Dimension, shape, weight... 11 7 Technical requirements... 11 8 Test methods... 13 9 Inspection rules... 14 10 Package, mark and certification... 14 Appendix A (Informative) Chemical composition of steel sheets and strips... 15 Appendix B (Informative) Comparison of similar designations at home and abroad 16 Bibliography... 17ForewordThis document is drafted in accordance with GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document is Part 7 of GB/T 20564 "Continuously cold rolled high strength steel sheet and strip for automobile". GB/T 20564 has issued the following parts. - Part 1.Bake 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; - Part 12.Dual phase steel with high formability. This document replaces GB/T 20564.7-2010 "Continuously cold rolled high strength steel sheet and strip for automobile - Part 7.Martensitic steels". Compared with GB/T 20564.7-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows. - Change the description of term of martensitic steel (see 3.1; 3.1 of the 2010 edition); - Add CR1350/1700MS designation and performance technical indicators; delete CR500/780MS designation (see Table 1; Table 1 of the 2010 edition); - Change the upper limit of yield strength of CR700/900MS designation (see Table 4; Table 4 of the 2010 edition); - Change the indicator of elongation after fracture (see Table 4; Table 4 of the 2010 edition); - Add provisions for inspection document type (see Clause 10). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights. This document was proposed by China Iron and Steel Association. This document shall be under the jurisdiction of National Technical Committee 183 on Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this document. Baoshan Iron & Steel Co., Ltd., China Metallurgical Information and Standardization Institute, Shougang Group Co., Ltd., Handan Branch of HBIS Co., Ltd., University of Science and Technology Beijing. Main drafters of this document. Yuan Min, Zhu Yan, Hu Ling, Li Qian, Liu Huasai, Deng Jianjun, Zhao Zhengzhi, Huang Jinhua, Hou Jie, Tian Zijian, Tang Mu, Xu Yonghui, Xiong Wei, Li Wei, Tu Shulin, Fang Xuehua, Xu Qing. This document was first issued in 2010.This is the first revision.1 ScopeThis document specifies the classification and designation representation method, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, package, mark and certification of continuously cold rolled high strength martensitic steel sheet and strip. This document applies to the continuously cold rolled high strength martensitic steel sheet and strip (hereinafter referred to as "steel sheet and strip") with a thickness of 0.50 mm~2.1 mm, which are mainly used for manufacturing automobile structures, reinforcements, and anti-collision parts.2 Normative referencesThe contents of the following documents, through normative references in this text, constitute indispensable provisions of this document. Among them, for dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document. 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 - Chrome 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 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method3 Terms and definitionsThe following term and definition applies to this document. 3.1 Martensitic steel; MS A steel whose microstructure is almost entirely martensitic structure and may contain a small amount of ferrite and/or bainite.4 Classification and designation representation method4.1 Designation representation method The designation of the steel sheet and strip consists of three parts. The initials "CR" of the English "Cold Rolled"; the numerical value of the specified minimum yield strength/the numerical value of the specified minimum tensile strength; the initials "MS" of the English "Martensitic Steel". 4.2 Classification 4.2.1 See Table 1 for the designations and recommended uses of steel sheets and strips. Table 1 -- Designations and recommended uses 4.2.2 The steel sheet and strip are classified according to the surface quality as shown in Table 2. 4.2.3 The steel sheet and strip are classified according to the surface structure as shown in Table 3.5 Order content5.1 Contracts or orders placed according to this document shall include the following. 5.2 If the information, such as dimension and roughness accuracy, surface quality level, surface structure type, edge state and package, is not specified in the order contract;6 Dimension, shape, weightThe dimension, shape, weight and tolerance of steel sheets and strips shall comply with the provisions of GB/T 708.7 Technical requirements7.1 Chemical composition Refer to Appendix A for reference values of the chemical composition (heat analysis) of steel. 7.2 Smelting method The steel used for steel sheets and strips shall be smelted by oxygen converter or electric furnace. Unless otherwise specified, the smelting method shall be selected by the supplier. 7.3 Delivery state 7.4 Mechanical properties The supplier guarantees that, within 6 months from the date of completion of manufacture, the mechanical properties of the steel sheet and strip shall comply with the provisions of Table 4. 7.5 Welding According to the chemical composition and strength level, the user shall determine the appropriate welding process; may consult the manufacturer if necessary. 7.6 Surface quality 7.6.1 On the surface of the steel sheet and strip, there shall be no defects such as scars, cracks, inclusions that are harmful to use. There shall be no visible delamination of steel sheets and strips.8 Test methods8.1 The chemical composition tests of steel are generally carried out according to GB/T 4336, GB/T 20123, GB/T 20125, GB/T 20126 or general chemical analysis methods. 8.2 The inspection items and test methods of steel sheets and strips shall comply with the provisions of Table 7.9 Inspection rules9.1 The inspection and acceptance of steel sheets and strips shall be carried out by the inspection department of the supplier. 9.2 Steel sheets and strips shall be inspected in lots. Each inspection lot shall be composed of steel sheets or strips of the same designation, specification, and processing state. The weight of each lot shall be no more than 30 t. 9.4 The re-inspection and determination rules for steel sheets and strips shall comply with the provisions of GB/T 17505. 9.5 The test results of chemical composition and mechanical properties are rounded according to the rounding value comparison method. The rules of rounding off shall be in accordance with the provisions of GB/T 8170.10 Package, mark and certificationThe package, mark and certification of steel sheets and strips shall comply with the provisions of GB/T 247.The type of certification (inspection document) shall comply with the provisions in GB/T 18253-2018.Appendix A(Informative) Chemical composition of steel sheets and strips The reference values of chemical composition (heat analysis) of steel sheets and strips are shown in Table A.1.Appendix B(Informative) Comparison of similar designations at home and abroad See Table B.1 for the comparison between the designations in this document and the foreign similar standard designations. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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