GB/T 3279-2023Hot-rolled spring steel plates, sheets and strips (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 3279-2009 "Spring Steel Hot Rolled Steel Plate". Compared with GB/T 3279-2009, except for structural adjustment and editing In addition to sexual changes, the main technical changes are as follows.

a) Added categories and codes (see Chapter 4);

b) The ordering content has been changed (see Chapter 5, Chapter 3 of the 2009 edition);

c) Changed the requirements for appearance (see Chapter 6, Chapter 4 of the 2009 edition);

d) The chemical composition of spring steel grades has been increased (see 7.1);

e) The delivery status is changed (see 7.3, 5.3 of the 2009 version);

f) Changed the requirements for mechanical properties (see 7.4, 5.4 of the 2009 edition);

g) Changed the requirements for decarburization layer (see 7.6, 5.6 of the 2009 edition);

h) Added requirements for non-metallic inclusions (see 7.8);

i) Changed the requirements for surface quality (see 7.9, 5.8 of the 2009 edition);

j) Added special requirements (see 7.10);

k) The test method has been changed (see Chapter 8, Chapter 6 of the 2009 edition).

1 Scope

This document specifies the classification and codes, ordering contents, dimensions, appearance, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of spring steel hot-rolled steel plates and strips.

This document applies to spring steel hot-rolled steel plates and steel strips (hereinafter referred to as steel plates and steel strips) with a nominal thickness not greater than 15mm.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 222 Allowable deviations in chemical composition of finished steel products

GB/T 223.5 Determination of acid-soluble silicon and total silicon content in iron and steel Reduced silicomolybdate spectrophotometry

GB/T 223.11 Determination of chromium content in steel and alloys by visual titration or potentiometric titration method

GB/T 223.19 Chemical analysis method for steel and alloys - Determination of copper content by new cuproline-chloroform extraction photometry

GB/T 223.23 Determination of nickel content in steel and alloys by diacetyl oxime spectrophotometry

GB/T 223.26 Determination of molybdenum content in steel and alloys Thiocyanate spectrophotometry

GB/T 223.59 Determination of phosphorus content in steel and alloys bismuth phosphorus molybdenum blue spectrophotometry and antimony phosphorus molybdenum blue spectrophotometry

GB/T 223.60 Chemical analysis methods for steel and alloys Determination of silicon content by perchloric acid dehydration gravimetric method

GB/T 223.64 Determination of manganese content in steel and alloys by flame atomic absorption spectrometry

GB/T 223.72 Gravimetric method for determination of sulfur content in steel and alloys

GB/T 223.76 Methods for chemical analysis of steel and alloys - Determination of vanadium content by flame atomic absorption spectrometry

GB/T 223.86 Determination of total carbon content of steel and alloys - Infrared absorption method after combustion in induction furnace

GB/T 224-2019 Determination of Decarburized Layer Depth of Steel

GB/T 226 Acid etching inspection method for low magnification structure and defects of steel

GB/T 228.1 Tensile testing of metallic materials Part 1: Room temperature test methods

GB/T 232 Bending test method for metal materials

GB/T 247 General provisions for packaging, marking and quality certificates of steel plates and steel strips

GB/T 709-2019 Dimensions, shapes, weights and tolerances of hot-rolled steel plates and strips

GB/T 2975 Sampling location and sample preparation for mechanical property testing of steel and steel products

GB/T 4336 Determination of multi-element content in carbon steel and medium-low alloy steel Spark discharge atomic emission spectrometry (conventional method)

GB/T 4340.1 Vickers hardness test of metallic materials Part 1: Test methods

GB/T 6394 Method for determination of average grain size of metals

GB/T 8170 Numerical rounding rules and representation and determination of limit values

GB/T 10561-2023 Standard rating chart microscopic examination method for determination of non-metallic inclusion content in steel

GB/T 13298 Metal microstructure examination methods

GB/T 13299 Evaluation method for free cementite, pearlite and Widmanstatten structure of steel

GB/T 13302-1991 Microscopic evaluation method of graphitic carbon in steel