GB/T 20564.6-2022 PDF EnglishUS$165.00 · In stock · Download in 9 seconds
GB/T 20564.6-2022: Continuously cold rolled high strength steel sheet and strip for automobile - Part 6: Transformation induced plasticity 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 20564.6: Historical versions
Similar standardsGB/T 20564.6-2022: Continuously cold rolled high strength steel sheet and strip for automobile - Part 6: Transformation induced plasticity 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/GBT20564.6-2022 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 CCS H 46 Replacing GB/T 20564.6-2010 Continuously Cold Rolled High Strength Steel Sheet and Strip for Automobile - Part 6.Transformation Induced Plasticity Steel Issued on. JULY 11, 2022 Implemented on. FEBRUARY 1, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 7 2 Normative References... 7 3 Terms and Definitions... 9 4 Classification and Designation Expression Method... 9 5 Order Content... 10 6 Dimensions, Shapes and Weights... 11 7 Technical Requirements... 11 8 Test Methods... 14 9 Inspection Rules... 15 10 Packaging, Marking and Quality Certificate... 15 11 Comparison of Similar Designations in China and Foreign Countries... 15 Appendix A (informative) Reference Values of Chemical Composition (melting analysis) of Steel Sheet and Strip... 16 Appendix B (informative) Comparison of Similar Designations in China and Foreign Countries... 17 Bibliography... 18ForewordThis document was drafted in accordance with the rules in GB/T 1.1-2020 Directives for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents. This document is Part 6 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 Steels; ---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 serves as a replacement of GB/T 20564.6-2010 Continuously Cold Rolled High Strength Steel Sheet and Strip for Automobile - Part 6.Transformation Induced Plasticity Steel. In comparison with GB/T 20564.6-2010, apart from structural adjustments and editorial modifications, the main technical changes are as follows. ---Some normative references are modified (see Chapter 2; Chapter 2 of Version 2010); ---The definition of transformation induced plasticity steel is modified (see 3.1; 3.1 of Version 2010); ---Designation CR450/780TR is added (see Table 1); ---The stipulations and description of performance guarantee time are added (see 7.4); ---The longitudinal mechanical property index requirements for designations CR400/690TR and CR450/780TR are added (see Table 5); ---The description and expression of the test method for value n are modified (see 8.3; 8.3 of Version 2010); ---The stipulations of the type of inspection documents are added (see Chapter 10). Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents. 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). The drafting organizations of this document. Baoshan Iron & Steel Co., Ltd. (BAOSTEEL); China Metallurgical Information and Standardization Institute; Xinyu Iron & Steel Group Co., Ltd.; Shougang Group; HBIS Group Handan Branch; University of Science and Technology Beijing. The main drafters of this document. Yuan Min, Zhu Yan, Tu Shulin, Li Qian, Shuai Yong, Jiang Yinghua, Li Yaoqiang, Zhao Zhengzhi, Hu Ling, Zhang Weixu, Tian Zijian, Li Shengyan, Yang FENG, Gai Lingjun, Xiong Wei, Zhong Yong, Huang Jinhua, Chen Honghui, Xu Qing. This document was firstly issued in 2010.This is the first revision.1 ScopeThis document specifies the classification and designation expression method, order contents, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of continuously cold rolled transformation induced plasticity high strength steel sheet and strip for automobile. This document is applicable to continuously cold rolled transformation induced plasticity high strength steel sheet and strip (with a thickness of 0.50 mm ~ 2.5 mm) mainly used to fabricate structural parts and reinforcements of automobile (hereinafter referred to as “the steel sheet and strip”).2 Normative ReferencesThe contents of the following documents constitute indispensable clauses of this document through the normative references in this text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum 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 Method GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content 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 Transformation Induced Plasticity Steel; TR Transformation induced plasticity steel refers to a type of steel whose microstructure is mainly ferrite, bainite and retained austenite, and during the forming process, the retained austenite may be transformed into a martensitic structure.4 Classification and Designation Expression Method4.1 Designation Expression Method The designation of the steel sheet and strip is composed of three parts. the initials “CR” of the English “Cold Rolled”, the specified minimum yield strength value / specified minimum tensile strength value, and the first two letters “TR” of the English “Transformation Induced Plasticity”. Example. CR380/590TR, in which. 4.2 Classification 4.2.1 The designations and recommended purposes of the steel sheet and strip are shown in Table 1. 4.2.2 In accordance with the surface quality level, the classification of the steel sheet and strip is shown in Table 2.5 Order Content5.1 Contracts or orders placed in accordance with this document shall include the following contents. 5.2 If the dimensions, unevenness accuracy, surface quality level, surface structure type, edge state and packaging are not specified in the order contract, then,6 Dimensions, Shapes and WeightsThe dimensions, shapes, weights and allowable deviations of the steel sheet and strip shall comply with the stipulations of GB/T 708.7 Technical Requirements7.1 Chemical Composition The reference values of the chemical composition (melting analysis) of steel are shown in Appendix A. 7.3 Delivery State 7.3.1 The steel sheet and strip shall be delivered in a flat state after annealing. 7.4 Mechanical Properties The supply-side shall guarantee that within 6 months from the date of completion of manufacture, the mechanical properties of the steel sheet and strip shall comply with the stipulations of Table 4 and Table 5. 7.5 Welding The user shall determine the appropriate welding process in accordance with the chemical composition and strength level, and if necessary, consult the manufacturer. 7.6 Surface Quality 7.7 Surface Structure a When the yield phenomenon is not obvious, the specified plastic elongation strength (Rp0.2) may be used instead. b When the nominal thickness of the product is greater than 0.50 mm, but not greater than 0.70 mm, the elongation at break is allowed to decrease 2%; when the nominal thickness of the product is 0.50 mm, the elongation at break is allowed to decrease 4%.8 Test Methods8.1 Generally speaking, the test of the chemical composition of steel shall be carried out in accordance with GB/T 4336, GB/T 20123 and GB/T 20125, or commonly used chemical analysis methods. The arbitration shall be carried out in accordance with the stipulations of GB/T 223.9, GB/T 223.12, GB/T 223.23, GB/T 223.26, GB/T 223.53, GB/T 223.54, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.64, GB/T 223.85 and GB/T 223.86. 8.2 The inspection items and test methods of the steel sheet and strip shall comply with the stipulations of Table 8.9 Inspection Rules9.1 The inspection and acceptance inspection of the steel sheet and strip shall be carried out by the inspection department of the supply-side. 9.2 The steel sheet and strip shall receive the acceptance inspection in batches. Each inspection batch shall be composed of steel sheet or strip of the same designation, specification and processing state. The weight of each batch shall be not greater than 30 t. 9.4 The re-inspection and determination rules of the steel sheet and strip shall comply with the stipulations of GB/T 17505. 9.5 The inspection results of chemical composition and mechanical properties shall be rounded off in accordance with the rounding-off value comparison method; the rounding-off rules shall comply with the stipulations of GB/T 8170.10 Packaging, Marking and Quality CertificateThe packaging, marking and quality certificate of the steel sheet and strip shall comply with the stipulations of GB/T 247.The type of the quality certificate (inspection document) shall comply with the stipulations of GB/T 18253-2018. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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