Standard No.:	GB/T 1222-2025
English Name:	Spring steels
Chinese Name:	弹簧钢
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-10-31
Implemented on:	2026-5-1
Status:	to be valid
Superseding:	GB/T 1222-2016 Spring steels GB/T 33164.1-2016 Spring steels for automotive suspension system―Part 1:Hot rolled spring steel flat bars GB/T 33164.2-2016 Spring steels for automotive suspension system―Part 2:Hot rolled round steel bar and wire rod
Target Language:	English
File Format:	PDF
Word Count:	14000 words
Translation Price(USD):	380.0
Delivery:	via email in 1 business day

GB/T 1222-2025 Spring steels English, Anglais, Englisch, Inglés, えいご 1 Scope This document specifies the ordering information, manufacturing processes, technical requirements, test methods, inspection rules, and packaging, marking, and quality certificate for spring steels. This document is applicable to round and square spring steels with a nominal diameter or side length not greater than 180 mm, spring steel flats with a nominal width not greater than 180 mm and a nominal thickness not greater than 70 mm, and spring steel rods with a nominal diameter not greater than 40mm (hereinafter collectively referred to as spring steels). The designations and chemical compositions of steel ingots, steel billets and their products may comply with this document by reference. 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 (all parts) Methods for chemical analysis of iron, steel and alloy GB/T 224 Determination of depth of decarburization of steels GB/T 225 Steel - Hardenability test by end quenching (Jominy test) 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 231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 702-2017 Hot-rolled steel bars - Dimensions, shape, weight and tolerances GB/T 905 Dimension, shape, weight and tolerance for cold-drawn round, square and hexagonal steels GB/T 908 Dimensions, shape, weight and tolerances of forged steel bars GB/T 1814 Inspection method for steel work fractures GB/T 1979 Standard diagrams for macrostructure and defect of structural steels GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 3078 Quality structural steel cold drawn bars GB/T 3207 Bright steel GB/T 4162 Forged and rolled steel bars - Method for ultrasonic testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 5216-2014 Structural steel with specified hardenability bands GB/T 6394 Determination of estimating the average grain size of metal GB/T 7736 Ultrasonic inspecting method for macro-structure and imperfection of steel GB/T 8170-2008 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 11261 Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method GB/T 13298 Inspection methods of microstructure for metals GB/T 13299 Determination of free cementite, pearlite and Widmanstaten structure in steel GB/T 14981-2009 Dimension, shape, mass and tolerance for hot-rolled round wire rod 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 37566 Method of ultrasonic testing for round steel YB/T 4413 Metallographic determination of core segregation in high carbon steel wire rod 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 3207 and the following apply. 3.1 spring steels steel having elastic properties and used for making springs or elastic elements Note: The elasticity of spring steels depends on their ability to elastically deform, that is, within the specified range, the ability to elastically deform enables it to bear a certain load without permanent deformation after the load is removed. 4 Order information Contracts or orders made based on this document should cover the following information:

Contents Foreword i 1 Scope 2 Normative References 3 Terms and definitions 4 Order information 5 Manufacturing process 6 Technical requirements 7 Test method 8 Inspection rules 9 Packaging, marking and quality certificate Annex A (Informative) Main purposes of spring steels with different designations Annex B (Informative) Comparison of the designations specified in this document with the ones stated in the previous editions as well as in domestic and foreign standards Annex C (Informative) Main technical parameters of spring steel 28SiMnB Annex D (Informative) Hardenability bends of some designations Annex E (Nominative) Cross-sectional shape, nominal dimension and shape of hot-rolled steel flats