GB/T 29913: Evolution and historical versions
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| GB/T 29913-2025 | English | 279 |
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Medium carbon alloy bearing steel
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GB/T 29913-2025
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| GB/T 29913.1-2013 | English | 299 |
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Bearing steel for wind power equipment -- Part 1: Yawing and variable pitch bearing steel
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GB/T 29913.1-2013
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Basic data | Standard ID | GB/T 29913-2025 (GB/T29913-2025) | | Description (Translated English) | Medium carbon alloy bearing steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H43 | | Classification of International Standard | 77.140.60 | | Word Count Estimation | 14,198 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 29913.1-2013 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 29913-2025: Medium carbon alloy bearing steel---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/GBT29913-2025
ICS 77.140.60
CCSH43
National Standards of the People's Republic of China
Replaces GB/T 29913.1-2013
Medium carbon alloy bearing steel
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
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 29913.1-2013 "Bearing steel for wind power equipment - Part 1.Steel for yaw and pitch bearings", and is consistent with...
Compared with GB/T 29913.1-2013, apart from structural adjustments and editorial changes, the main technical changes are as follows.
---The nominal diameter range for continuously cast round billets, hot-rolled and forged bars has been changed (see Chapter 1, Chapter 1 of the.2013 edition);
---The steel grade and chemical composition have been changed (see 6.1, 5.1 in the.2013 edition);
---The hardness requirements have been changed (see 6.2, 5.3.2 in the.2013 edition);
---The requirements for low-magnification microstructure of continuously cast round billets have been changed (see 6.3, 5.4 in the.2013 edition);
---The requirements for non-metallic inclusions have been changed (see 6.4, 5.6 in the.2013 edition);
---The requirements for dimensions and tolerances have been changed (see 6.7.1, 4.1 in the.2013 version);
---The requirements for out-of-roundness of continuously cast round billets have been changed (see 6.7.3, 4.3 in the.2013 edition);
---The requirements for the end shape have been changed (see 6.7.6, 4.6 in the.2013 version);
---The test methods for oxygen content, hardness, low magnification, non-metallic inclusions, macroscopic non-metallic inclusions, internal and surface quality have been modified.
Law (see Chapter 7, Chapter 6 in the.2013 edition).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. Jiangyin Xingcheng Special Steel Co., Ltd., Jiangsu Yonggang Group Co., Ltd., and Fushun Special Steel Co., Ltd.
Luoyang Bearing Research Institute Co., Ltd., and Metallurgical Industry Information and Standardization Research Institute.
The main drafters of this document are. Xia Dongdong, Yin Qing, Chen Yuanqing, Meng Yu, Li Tao, Wang Shanshan, Yu Jie, Wang Xinhe, Jiang Nan, Ma Yongqiang, and Gao Yuanan.
Yan Chengming, Liu Qian, Fu Huagang, Han Bin.
The release history of this document and the document it replaces is as follows.
---First published in.2013 as GB/T 29913.1-2013, this is the first revision.
Medium carbon alloy bearing steel
1.Scope
This document specifies the ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and other aspects for medium carbon alloy bearing steel.
Certificate of Quality.
This document applies to continuously cast round billets with a nominal diameter of 250mm to 1350mm and hot-rolled bars with a nominal diameter not exceeding 500mm.
Steel, as well as forged bars with a nominal diameter not exceeding 1200 mm (hereinafter referred to as "steel"). Its chemical composition also applies to steel ingots.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 223 (all parts) Chemical Analysis Methods for Iron and Steel and Alloys
GB/T 225 Steel - End-quenching test method for hardenability (Jominy test)
GB/T 226 Steel - Low-magnification microstructure and defect testing method using acid etching
GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method
GB/T 1814 Test Method for Fracture Surface of Steel
GB/T 1979 Low-magnification microstructure defect rating diagram for structural steel
GB/T 2101 General Provisions for Acceptance, Packaging, Marking and Quality Certificate of Section Steel
GB/T 4162 Ultrasonic Testing Method for Forged and Rolled Steel Bars
GB/T 4336 Determination of Multi-Element Content in Carbon Steel and Medium-Low Alloy Steels by Spark Discharge Atomic Emission Spectrometry (Conventional Method)
GB/T 6394 Method for Determination of Average Grain Size of Metals
GB/T 6402 Ultrasonic Testing Methods for Steel Forgings
GB/T 10561-2023 Standard rating chart microscopic examination method for the determination of non-metallic inclusion content in steel
GB/T 11261 Determination of Oxygen Content in Iron and Steel - Pulse Heating Inert Gas Fusion-Infrared Absorption Method
GB/T 15711 Inspection of Non-metallic Inclusions in Steel - Tower-shaped Hairline Cracks - Acid Immersion Method
GB/T 20066 Sampling and Sample Preparation Methods for the Determination of Chemical Composition of Steel and Iron
GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel - Infrared Absorption Method After Combustion in a High-Frequency Induction Furnace (Conventional Method)
GB/T 38683 Ultrasonic testing method for large inclusions in bearing steel
YB/T 153-2015 Low-magnification microstructure defect rating diagram for high-quality structural steel continuously cast billets
3.Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Order details
The contract or order placed under this document contains the following.
a) This document number;
b) Product Name;
c) Brand;
d) Specifications;
e) Weight (or quantity);
f) Delivery status;
g) Special requirements.
5.Manufacturing process
5.1 Smelting Method
Steel should be smelted in an electric furnace (or converter) and then refined outside the furnace and degassed under vacuum.
5.2 Delivery Status
5.2.1 Continuously cast round billets and steel ingots shall be delivered in the as-cast condition, hot-rolled bars shall be delivered in the hot-rolled condition, and forged bars shall be delivered in the forged condition.
5.2.2 With the consent of both the supplier and the buyer, and as specified in the contract, steel may also be delivered in an annealed condition.
6.Technical Requirements
6.1 Grade and Chemical Composition
6.1.1 The steel grade and chemical composition (smelting analysis) shall conform to the provisions of Table 1.
6.1.2 The oxygen content (mass fraction) in the steel shall not exceed 0.0015%, and the hydrogen content (mass fraction) shall not exceed 0.00020%.
6.1.3 The content (mass fraction) of tin, arsenic, antimony, lead and bismuth in steel shall not exceed 0.010%.
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