GB/T 1222-2025 PDF English
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GB/T 1222: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 1222-2025 | 495 | Add to Cart | Auto, 9 seconds. | Spring steels | Valid |
| GB/T 1222-2016 | 145 | Add to Cart | Auto, 9 seconds. | Spring steels | Valid |
| GB/T 1222-2007 | 105 | Add to Cart | Auto, 9 seconds. | Spring steels | Obsolete |
| GB/T 1222-1984 | 479 | Add to Cart | 4 days | Spring steels | Obsolete |
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GB/T 1222-2025: Spring steels
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1222-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.25 CCS H 40 Replacing GB/T 1222-2016, GB/T 33164.1-2016, GB/T 33164.2-2016 Spring Steels Issued on: OCTOBER 31, 2025 Implemented on: MAY 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4 1 Scope... 6 2 Normative References... 6 3 Terms and Definitions... 8 4 Ordering Contents... 8 5 Manufacturing Process... 9 5.1 Smelting method... 9 5.2 Delivery condition... 9 6 Technical Requirements... 9 6.1 Designation and chemical composition... 9 6.2 Hardness... 12 6.3 Mechanical properties... 13 6.4 Hardenability... 15 6.5 Low magnification... 15 6.6 Non-metallic inclusions... 16 6.7 Decarburized layer... 16 6.8 Grain size... 18 6.9 Surface quality... 18 6.10 Dimensions, shape, and weight... 19 6.11 Special requirements... 19 7 Test Methods... 20 8 Inspection Rules... 21 8.1 Inspection and acceptance... 21 8.2 Batching rules... 21 8.3 Sampling quantity and sampling location... 21 8.4 Reinspection and judgment rules... 21 8.5 Rounding-off numerical values... 21 9 Packaging, Marking, and Quality Certificate... 22 Appendix A (Informative) Main Uses of Each Designation... 23 Appendix B (Informative) Comparison List of Designations in this Document with those in Previous Editions and Domestic/International Standards... 25 Appendix C (Informative) Main Technical Parameters of 28SiMnB Steel... 27 Spring Steels1 Scope
This Document specifies the ordering contents, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate for spring steels. This Document applies to round and square spring steel bars with a nominal diameter or side length no more than 180 mm; flat spring steel bars with a nominal width no more than 180 mm and a nominal thickness no more than 70 mm; and spring steel wire rods with a nominal diameter no more than 40 mm (hereinafter collectively referred to as steels). The designations and chemical compositions of steel ingots, billets, and their products shall be followed accordingly.2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 222 Permissible tolerances for chemical composition of steel products GBT 223 (all parts) Methods for chemical analysis of iron, steel and alloy GB/T 224 Determination of the 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 of cold-drawn round, square and hexagonal steels GB/T 908 Forged bars - Dimensions, shape, weight and tolerances 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 Method for ultrasonic testing of forged and rolled steel bars 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 judgement 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 rod3 Terms and Definitions
For the purposes of this Document, the terms and definitions defined in GB/T 3207 and the following apply. 3.1 Spring steels Steels that possess elastic properties and used for manufacturing springs or elastic elements. NOTE. The elasticity of steel depends on its ability to undergo elastic deformation, that is, within a specified range, its ability to undergo elastic deformation allows it to withstand a certain load without permanent deformation after the load is removed.4 Ordering Contents
Contracts or orders placed in accordance with this Document should include the following information. a) This Document number; b) Product name; c) Designation or Uniform Numerical Code; d) Dimensions and precision; e) Weight (or quantity); f) Delivery condition or code; g) Mechanical properties (tempering temperature of 60Si2Mn); h) Hardenability; i) Low magnification grouping; j) Grouping of non-metallic inclusions; k) Decarburized layer (grouping of hot-rolled materials); l) Application (e.g., for automotive suspension systems); m) Special requirements.5 Manufacturing Process
5.1 Smelting method Unless otherwise specified in the contract, the smelting method shall be selected by the supplier. 5.2 Delivery condition Steel shall be delivered according to the pressure processing methods, heat treatment methods, and surface roughness listed in Table 1.The specific delivery condition (or code) shall be specified in the contract. EXAMPLE. Hot-rolled stress-relieved annealed spring steel (code. WHR+A); hot-rolled softened annealed spring steel with a surface roughness of Grade 1 (code. WHR+SA+FB).6 Technical Requirements
6.1 Designation and chemical composition 6.1.1 The designation, unified numerical code, and chemical composition (smelting analysis) of the steel shall conform to the provisions of Table 2.Other designations of spring steel may also be supplied upon negotiation between the supplier and the purchaser and specified in the contract. Key. A, B, C, D, E - Length of the fully decarburized layer of the ferrite NOTE. d indicates the nominal diameter. Figure 1 -- Schematic diagram of total decarbonized layer of a localized and sporadic ferrite on the surface of wire rod 6.8 Grain size Steel shall undergo austenitic grain size testing, with an acceptance level of 6 or thinner. 6.9 Surface quality 6.9.1 The surface of hot-rolled or forged round, square, and flat steel shall be free from visually visible cracks, folds, scale, inclusions, delamination, and indented iron oxide scale. Local defects in the steel shall be removed without causing harmful effects on the use of the steel, and the minimum permissible dimensions of the steel shall be maintained. The width of the removed area shall be no less than 5 times the depth of removal. Individual minor scratches and indentations not exceeding half the nominal dimensional tolerance from the actual size are permissible. 6.9.2 The surface of wire rod shall be smooth and free from visually visible cracks, folds, burrs, scabs, inclusions, and other harmful defects. Localized indentations, bumps, scratches, and roughness are permissible, but their depth or height, measured from the actual dimension, shall not exceed 0.10 mm. 6.9.3 The surface of cold-drawn round steel shall conform to the provisions of GB/T 3078. 6.9.4 The surface of bright steel shall be clean and smooth, free from visually visible external defects such as cracks, hairline cracks, folds, scratches, dents, scabs, rust, and iron oxide scale, etc. Individual minor scratches, straightening marks, and peeling spirals with a depth not exceeding half the nominal diameter tolerance are permissible. 6.9.5 The surface roughness of bright steel shall conform to the provisions of Table 11.The specific roughness level shall be specified in the contract; if not specified, the steel shall be supplied as per Level 2. 6.10 Dimensions, shape, and weight 6.10.1 Dimensions and permissible deviations 6.10.1.1 The dimensions, shape, and permissible deviations of hot-rolled round and square steel bars shall conform to the provisions of GB/T 702-2017.Specific requirements shall be specified in the contract. If not specified, they shall conform to the provisions of Group 2 in GB/T 702- 2017. 6.10.1.2 The dimensions and permissible deviations of hot-rolled wire rods shall conform to the provisions of GB/T 14981-2009.Specific requirements shall be specified in the contract. If not specified, they shall conform to the provisions of Level B precision in GB/T 14981-2009. 6.10.1.3 The dimensions, shape, and permissible deviations of cold-drawn round and square steels shall conform to the provisions of GB/T 905.Specific requirements shall be specified in the contract. 6.10.1.4 The dimensions, shape, and permissible deviations of forged round and square steels shall conform to the provisions of GB/T 908, and specific requirements shall be specified in the contract. 6.10.1.5 The dimensions, shape, and permissible deviations of bright steels shall conform to the provisions of GB/T 3207, and specific requirements shall be specified in the contract. 6.10.1.6 The dimensions, shape, and permissible deviations of hot-rolled flat steels shall conform to the provisions of Appendix E, and specific requirements shall be specified in the contract. 6.10.2 Weight Steel shall be delivered by actual weight. 6.11 Special requirements Based on the purchaser's requirements, and upon negotiation between the supplier and the purchaser, and as specified in the contract, steel with the following special requirements may be supplied. a) Expanded scope of this Document; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
