GB/T 20887.4-2022 English version High-strength hot continuous rolling steel plate and steel strip Part 4: Phase change-induced plastic steel
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1 Scope
This document specifies the terms and definitions, classification and grade representation methods, ordering content, size, appearance, weight, technical requirements, test methods, inspection rules, packaging, markings and quality certificates for automotive high-strength hot rolling phase change-induced plastic steel plates and steel strips.
This document applies to hot-rolled phase-change-induced plastic steel strips with a thickness of not more than 6.0 mm, and steel plates cut across the cross and longitudinally cut longitudinally cut steel strips (hereinafter referred to as "steel plates and steel strips").
2 Normative reference file
The contents of the following files constitute an indispensable clause in this document through normative references in the text. Among them, only the version corresponding to the date is applicable to this file; the latest version (including all modifications) of the reference files without the date is applicable to this file.
GB/T 222 Allowable deviation of chemical composition of steel
GB/T 223.5 Steel Determination of acid-soluble silicon and total silicon content Reduced silicon molybdate spectrophotometry
GB/T 223.9 Steel and alloy Determination of aluminum content Chromium S spectrophotometry
GB/T 223.12 Chemical analysis method of steel and alloys Sodium carbonate separation-diphenyl carboyl dihydrazine photometry
GB/T 223.23 Steel and alloy Determination of nickel content Butanedione oxime spectrophotometry
GB/T 223.26 Steel and alloy Determination of molybdenum content Thiocyanate spectrophotometry
GB/T 223.53 Steel and alloy Chemical analysis method Flame atomic absorption spectrophotometry Determination of copper content
GB/T 223.54 Steel and alloys Determination of nickel content Flame atomic absorption spectrophotometry
GB/T 223.59 Steel and alloys Determination of phosphorus content Bismuth phosphorus molybdenum blue spectrophotometry and antimony phosphorus molybdenum blue spectrophotometry
GB/T 223.60 Steel and alloys Chemical analysis method Perchloric acid dehydration weight method Determination of silicon content
GB/T 223.63 Steel and alloys Chemical analysis method Sodium periodate (potassium) photometry Determination of manganese content
GB/T 223.64 Steel and alloys Determination of manganese content Flame atomic absorption spectrophotometry
GB/T 223.85 Steel and alloys Determination of sulfur content Infrared absorption method after combustion induction furnace
GB/T 223.86 Steel and alloys Determination of total carbon content Infrared absorption method after combustion induction furnace
GB/T 228.1 Metal materials Tensile test Part 1: Room temperature test method
GB/T 247 General provisions for packaging, marking and quality certificates of steel plates and steel strips
GB/T 709 Hot rolled steel plates and steel strips
GB/T 2975 Steel and steel products Mechanical performance test sampling location and sample preparation
GB/T 4336 Carbon steel and medium low alloy steel Determination of multi-element content Spark discharge atomic emission spectroscopy (regular method)
GB/T 5028 Metal materials Thin plates and strips Determination of tensile strain hardening index (n value)
GB/T 6394 Metal average grain size determination method
GB/T 8170 Numerical modification rules and representation and determination of limit values
GB/T 10561 Determination of non-metal inclusion content in steel Standard rating diagram Microscopic inspection method
GB/T 13298 Metal microstructure inspection method
GB/T 17505 Steel and steel products General technical requirements for delivery
GB/T 18253—2018 Steel and steel products Type of inspection file
GB/T 20066 Steel and iron Sampling and sample preparation methods for chemical composition determination
GB/T 20123 Steel Determination of total carbon and sulfur content Infrared absorption method after combustion of high-frequency induction furnace (conventional method)
GB/T 20125 Low alloy steel Determination of multi-element Inductively coupled plasma emission spectroscopy
GB/T 24174 Steel Determination of baking hardening value (BH2)
GB/T 38813 General requirements for hot-rolled pickled steel plates and steel strips
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
phase change-induced plasticity steel transformation induced plasticity steel 6 microstructure is mainly ferrite , bainite and residual austenite. During the forming process, the residual austenite can be transformed into steel with martensite structure.
Note: Phase change-induced plastic steel has high work hardening rate, uniform elongation and tensile strength .
4 Classification and Grade Representation Method
4.1 Classification
4.1.1 Steel plates and steel strips are divided into:
a) hot-rolled surface;
b) hot-rolled pickled surface. When the surface state is a hot-rolled pickled surface, it is represented by the code "P".
4.1.2 Steel plates and steel strips are divided into:
a) ordinary grade surface (FA);
b) higher-grade surface (FB) according to surface quality.
4.2 Grade representation method
The grade of steel plate and steel strip consists of three parts: the first letter "HR" of hot-rolled English "Hot Rolled", the value of the specified minimum yield strength /the value of the specified minimum tensile strength, and the first two letters "TR" of the phase change English "Transformation".
example: HR400/590TR
HR - the first letter of hot rolled English "Hot Rolled";
745-2007 Classification and performance of advanced high-strength automotive boards
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