Hot-rolled spring steel plates, sheets and strips
1 Scope
This standard specifies the classification and designation, order contents, dimensions, shape and weights, technical requirements, test methods, inspection rules, and packaging, marking and quality certificate of hot-rolled spring steel plates, sheets and strips.
This document is applicable to hot-rolled spring steel plates, sheets and strips with nominal thickness not greater than 15 mm (hereinafter referred to as steel plates, sheets and strips).
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper 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 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content
GB/T 223.86 Steel, iron and alloy - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
GB/T 224-2019 Determination of depth of decarburization of steel
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 232 Metallic materials--Bend test
GB/T 247 General rule of package mark and certification for steel plates (sheets) and strips
GB/T 709-2019 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10561-2023 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Determination of free cementite, pearlite and Widmanstaten structure in steel
GB/T 13302-1991 Steel - Determination of area content of graphite-micrographic method using diagrams
GB/T 17505 Steel and steel products - General technical delivery requirements
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 4395 Steel - Determination of molybdenum, niobium and tungsten contents - Inductively coupled plasma atomic emission spectrometric method
3 Terms and definitions
No terms and definitions are listed in this document.
4 Classification and designation
4.1 According to the edge state, steel plates, sheets and strips are classified as follows:
a) Trimming, designation: EC;
b) No trimming, designation: EM.
4.2 According to the thickness accuracy, continuous rolled steel plates, sheets and strips are classified as follows:
a) Ordinary thickness accuracy, designation: PT.A;
b) Higher thickness accuracy, designation: PT.B.
4.3 According to the surface treatment method, steel plates, sheets and strips are classified as follows:
a) Rolled surface, designation: SR;
b) Acid-pickled surface, designation: SA.
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 Ordering information
6 Dimension, shape and weight
7 Technical requirements
8 Test methods
9 Inspection rules
Annex A (Normative) Dimensions, shape and tolerances for steel strips with nominal width less than 600mm
Annex B (Informative) Comparison list of the designations in this document and the designations in Chinese and international standards
Bibliography
