GB/T 20887.2-2022 PDF EnglishUS$185.00 · In stock · Download in 9 seconds
GB/T 20887.2-2022: Continuously hot rolled high strength steel sheet and strip for automobile - Part 2: High hole expansion 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 20887.2: Historical versions
Similar standardsGB/T 20887.2-2022: Continuously hot rolled high strength steel sheet and strip for automobile - Part 2: High hole expansion 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/GBT20887.2-2022 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 CCS H 46 Replacing GB/T 20887.2-2010 Continuously hot rolled high strength steel sheet and strip for automobile - Part 2.High hole expansion 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... 10 5 Order content... 10 6 Dimension, shape, weight... 11 7 Technical requirements... 11 8 Test methods... 14 9 Inspection rules... 15 10 Package, mark and certification... 15 Appendix A (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 2 of GB/T 20887 "Continuously hot rolled high strength steel sheet and strip for automobile". GB/T 20887 has issued the following 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 document replaces GB/T 20887.2-2010 "Continuously hot rolled high strength steel sheet and strip for automobile - Part 2.High hole expansion steel". Compared with GB/T 20887.2-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Change the term and definition of high hole expansion steel (see 3.1; 3.1 of the 2010 edition); b) Add HR380/540HE, HR520/680HE, and HR780/980HE designations and their corresponding technical requirements (see Table 1 and Table 2); c) Add the provisions for chemical composition (see Table 1); d) Add the provisions for the guaranteed time of mechanical properties (see 7.4); e) Add the provisions for the upper limit of tensile strength (see Table 2); f) Change HR440/580HE upper limit of yield strength AND elongation after fracture with gauge length of 80 mm (see Table 2; Table 1 of the 2010 edition); g) Add the provisions for elongation after fracture with a gauge length of 50 mm; add the regulation that the specified minimum elongation after fracture is reduced by 2% when the thickness is ≤3 mm (see Table 2); h) Add the requirement that the quality of pickled surface after negotiation can also be implemented in accordance with the provisions of GB/T 38813 (see 7.5.4); i) Add special requirements that tensile strain hardening exponent and metallographic microstructure inspection can be added (see 7.6); j) Change the lot grouping weight from 40 t to 60 t (see 9.2; 8.5 of the 2010 edition); k) Add the 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, Bensteel Plates Co., Ltd., Anyang Iron & Steel Co., Ltd., Shougang Group Co., Ltd., Handan Branch of HBIS Co., Ltd., University of Science and Technology Beijing. Main drafters of this document. Huang Jinhua, Zhu Yan, Tu Shulin, Li Qian, Liu Yansong, Wan Guoxi, Guo Jia, Zhu Tanhua, Zhao Zhengzhi, Yuan Min, Hou Jie, Sun Menghan, Liu Zhipu, Cao Erzhuan, Shi Li, Li Yuqian, Lu Min, Liu Keyun, Wang Huanrong, Hu Ling, Xu Qing, He Zhibing. This document was first issued in 2010.This is the first revision.1 ScopeThis document specifies the terms and definitions, classification and designation representation method, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, package, mark and certification of continuously hot rolled high-strength high hole expansion steel sheet and strip for automobile. This document applies to continuously hot rolled steel strips with high hole expansion property with a thickness of not more than 6.0 mm, steel sheets cross-cut from them, and longitudinally-cut steel strips (hereinafter referred to as "steel sheets and strips").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 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 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 High hole expansion steel; HE A steel whose microstructure is mainly "ferrite + bainite" or ferrite (or strengthened ferrite) or bainite (or strengthened bainite), etc.4 Classification and designation representation method4.1 Classification 4.1.1 According to the surface state, steel sheets and strips are classified into. 4.1.2 According to the surface quality, steel sheets and strips are classified into. 4.2 Designation representation method The designation of the steel sheets and strips is composed of three parts. The initials "HR" of the English "Hot Rolled"; the specified minimum yield strength value/the specified minimum tensile strength value; the initials "HE" of the English "Hole Expansion".5 Order content5.1 Contracts or orders placed according to this document shall include the following. 5.2 If the information such as surface state and thickness accuracy is not specified in the order contract, it shall supply those with hot rolled surface and ordinary thickness accuracy.6 Dimension, shape, weightThe dimension, shape, weight and tolerance of steel sheets and strips shall comply with the provisions of GB/T 709.7 Technical requirements7.1 Designation and chemical composition 7.2 Smelting method The steel used for the steel sheet and strip is smelted in an oxygen converter or an electric arc furnace. Unless otherwise specified, the smelting method is selected by the supplier. 7.3 Delivery state 7.3.1 Steel sheets and strips are delivered in hot rolled state. 7.4 Mechanical properties The supplier 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 provisions of Table 2. 7.5 Surface quality 7.5.1 On the surface of the steel sheet and strip, there shall be no defects such as cracks, scars, folds, bubbles and inclusions that are harmful to use. There shall be no visible delamination on the steel sheet and strip. 7.6 Special requirements According to the requirements of the purchaser, after negotiation between the supplier and the purchaser, and indicated in the contract, inspections such as tensile strain hardening exponent (n value), grain size, nonmetallic inclusions, and metallographic microstructure can be added.8 Test methods8.1 The chemical composition tests of steel are generally carried out according to the chemical analysis methods of GB/T 4336, GB/T 20123, GB/T 20125 or general methods. 8.2 The inspection items and test methods of steel sheets and strips shall comply with the requirements of Table 4.9 Inspection rules9.1 The inspection and acceptance of steel sheets and strips shall be carried out by the quality inspection department of the supplier. 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.Appendix A(Informative) Comparison of similar designations at home and abroad The comparison between the designations in this document and those in GB/T 20887.2- 2010 and similar designations in foreign standards is shown in Table A.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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