|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
GB/T 20887.2-2022 English PDF (GB/T 20887.2-2010)
GB/T 20887.2-2022 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 Contents Foreword ... 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 ... 17 Continuously hot rolled high strength steel sheet and strip for automobile - Part 2: High hole expansion steel 1 Scope This 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 references The 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 method GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method - Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent GB/T 6394 Metal - Methods for Estimating the Average Grain Size GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement of Limiting Values GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams GB/T 13298 Inspection methods of microstructure for metals GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements GB/T 18253-2018 Steel and steel products - Types of inspection documents GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 24524 Metallic materials - Sheet and strip - Hole expanding test GB/T 38813 General requirements for hot-rolled pickled steel sheet and strip 3 Terms and definitions The 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. Note: High hole expansion steel has high tensile strength, high formability, and good flange flanging formability. High hole expansion steel is also sometimes referred to as ferritic-bainitic steel (FB) or high flange flanging high-strength steel (SF). 4 Classification and designation representation method 4.1 Classification 4.1.1 According to the surface state, steel sheets and strips are classified into: a) Hot rolled surface; b) Hot rolled pickled surface. When the surface state is hot rolled pickled surface, it is represented by the code "P". 4.1.2 According to the surface quality, steel sheets and strips are classified into: a) Ordinary surface (FA); b) Relatively-advanced surface (FB). 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". Example: HR440/580HE HR - The initials of the English "Hot Rolled"; 440/580 - 440 is the specified minimum yield strength value; 580 is the specified minimum tensile strength value; in megapascals (MPa); HE - The initials of the English "Hole Expansion". 5 Order content 5.1 Contracts or orders placed according to this document shall include the following: a) Product name (steel sheet or strip); b) Number of this document; c) Designation; d) Specification and dimension, roughness accuracy; e) Surface state (Pickled surface is represented by the code "P"); 9 Inspection rules 9.1 The inspection and acceptance of steel sheets and strips shall be carried out by the quality inspection department of the supplier. 9.2 Steel sheets and strips shall be accepted in lots. Each lot shall consist of steel sheets or strips of the same designation, heat number, thickness and rolling system with a weight not greater than 60 t. Steel strips and continuously rolled steel sheets with a rolled coil weight greater than 30 t can be batched into two rolled coils. 9.3 The sampling quantity and sampling methods of steel sheets and strips shall comply with the provisions of Table 4. 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 certification The 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. When the inspection document type is not specified, it shall be in accordance with Type 3.1 of GB/T 18253-2018. ...... GB/T 20887.2-2010 Continuously hot rolled high strength steel sheet and strip for automobile.Part 2. High hole expansion steel ICS 77.140.50 H46 National Standards of People's Republic of China High - strength hot - rolled steel sheet and strip for automobile Part 2. Highly expanded steel Part 2. Highholeexpansionsteel 2010-09-02 release 2011-06-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released Preface GB/T 20887 "automotive high-strength hot-rolled steel sheet and strip" is divided into five parts. Part 1. High Yield Strength Steel for Cold Forming Part 2. Highly expanded steel Part 3. Duplex steel Part 4. Phase change induced plasticity steel Part 5. Martensitic steel This part is part 2 of GB/T 20887. Appendix A and Appendix B of this section are informative. This part is made by China Iron and Steel Industry Association. This part is headed by the National Steel Standardization Technical Committee. This part of the drafting unit. Baoshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Shougang Corporation. This part of the main drafters. Li Yuguang, Tu Shu Lin, Xu Hongwei, Huang Jinhua, Yu Chengfeng, Sun Zhongming, Wang Xiaohu, Shi Hongyan, Xu Qing, Zhang jiansu, Lu Min. High - strength hot - rolled steel sheet and strip for automobile Part 2. Highly expanded steel 1 Scope This section specifies the classification and code, size, shape, weight, technical requirements, inspection and testing of hot rolled steel sheets and strips for high-expansion steel, Packaging, signs and quality certificates. This part is applicable to steel plates with high expansion performance and not more than 6mm. Slitting steel, hereinafter referred to as steel and steel. 2 normative reference documents The terms of this document are incorporated by reference in this section and become part of this section. Whichever is the date of the reference file, which is followed by all (Excluding corrigenda) or revisions do not apply to this part, however, encourage parties to reach an agreement under this section Whether you can use the latest version of these files. For undated references, the latest edition applies to this section. GB/T 222 Determination of chemical composition of finished steel GB/T 223.5 Determination of silicon and total silicon content of iron and silicon in steel - Reduced molybdosilicate spectrophotometric method Steel and alloys - Determination of aluminum content - Chromazu S spectrophotometric method GB/T GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - Sodium carbonate separation - Diphenyl acid milling - bishydrazine photometric method for the determination of chromium content GB/T 223.17 Methods for chemical analysis of iron, steel and alloy The diantipyrylmethane photometric method for the determination of titanium content Iron and steel - Determination of nickel content - Butadiene oxime spectrophotometric method GB/T Iron and steel - Determination of molybdenum content - Thiocyanate spectrophotometric method GB/T 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 Determination of phosphorus content of iron, steel and alloy - Bismuth phosphorus molybdenum blue spectrophotometric method and antimony phosphomolybdenum blue spectrophotometric method GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - Perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.62 Methods for chemical analysis of iron, steel and alloy The butyl acetate extraction spectrophotometric method for the determination of phosphorus GB/T 223.63 Methods for chemical analysis of iron, steel and alloy The sodium periodate (potassium) spectrophotometric method for the determination of manganese content Iron and steel - Determination of manganese content - Flame atomic absorption spectrometric method GB/T GB/T 223.78 Methods for chemical analysis of iron, steel and alloy The curcumin direct spectrophotometric method for the determination of boron content Test method for room temperature tensile testing of metallic materials GB/T General requirements for GB/T 247 steel sheet and strip packing, marking and quality certificates GB/T 709 Hot rolled steel sheet and strip size, shape, weight and allowable deviation GB/T 2975 steel and steel products mechanical properties test sampling location and sample preparation GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometric method (conventional method) GB/T 6394 Determination of average grain size of metals Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170 GB/T 10561 Determination of content of nonmetallic inclusions in steel - Standard rating chart Microscopy method Sheet metal forming properties and test methods - Part 4. Reaming test General technical requirements for delivery of steel and steel products GB/T 17505 Sampling and sample preparation methods for the determination of chemical constituents of steels and iron GB/T GB/T .20123 Determination of total carbon and sulfur content of steel - High frequency induction furnace after combustion infrared absorption method (conventional method) ...... Similar standards: GB/T 20887.3-2022 GB/T 20887.4-2022 Similar PDFs (Auto-delivered in 9 seconds): GB/T 20887.2-2022 GB/T 20887.3-2022 GB/T 20887.1-2017 GB/T 20887.4-2022 |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||