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GB/T 4337-2025: Metallic materials - Fatigue testing - Rotating bar bending method
Status: Valid GB/T 4337: Evolution and historical versions
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Metallic materials - Fatigue testing - Rotating bar bending method
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GB/T 4337-2025
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| GB/T 4337-2015 | English | 380 |
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Metallic materials -- Fatigue testing -- Rotating bar bending method
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GB/T 4337-2015
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| GB/T 4337-2008 | English | 759 |
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Metallic materials -- Fatigue testing -- Rotating bar bending method
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| GB/T 4337-1984 | English | 439 |
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Metals--Rotating bar bending fatigue testing
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GB/T 4337-1984
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Basic data | Standard ID | GB/T 4337-2025 (GB/T4337-2025) | | Description (Translated English) | Metallic materials - Fatigue testing - Rotating bar bending method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H22 | | Classification of International Standard | 77.040.10 | | Word Count Estimation | 30,334 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 4337-2015 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 4337-2025: Metallic materials - Fatigue testing - Rotating bar bending method---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/GBT4337-2025
ICS 77.040.10
CCSH22
National Standard of the People's Republic of China
Replaces GB/T 4337-2015
Rotational bending method for fatigue testing of metallic materials
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols and instructions 2
5 Principle 2
6 Shape and size of specimen 3
7 Sample preparation 8
8 Accuracy of test equipment 9
9 Heating device and temperature measuring device 10
10 Test Procedure 10
11 Test Report 12
12 Presentation of test results 13
13 Measurement uncertainty 14
Appendix A (Normative) Calibration of the bending moment of the rotary bending fatigue testing machine 15
Appendix B (Informative) Example of test report 22
Reference 23
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 4337-2015 "Metallic materials fatigue test - Rotational bending method" and is consistent with GB/T 4337-2015.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Changed the scope of application and added "This document does not include fatigue tests on notched specimens, as the shape and size of notched specimens are not yet
However, the fatigue test procedures described in this document can also be applied to fatigue testing of notched specimens (see Chapter 1,
Chapter 1 of the.2015 edition);
--- Deleted the term endurance limit stress (fatigue limit) (see 3.8 of the.2015 edition);
--- Changed the “Test stress calculation and loading table for different types of testing machines” (see Table 2, Table 2 of the.2015 edition);
--- Increase the methods for measuring the sample temperature in the high temperature test step from two to three (see 10.5.2, 10.5.2 of the.2015 edition);
--- Increased measurement uncertainty (see Chapter 13).
This document is modified to adopt ISO 1143.2021 "Metallic materials - Rotating bar bending fatigue test".
The technical differences between this document and ISO 1143.2021 and their reasons are as follows.
--- Added "rotational bending fatigue test in other environments (such as corrosion) shall refer to this document" in the scope to adapt to my country's
Technical conditions, increase operability;
--- The normative references GB/T 3075 replace ISO 1099 (see Chapter 3), GB/T 10623 replaces ISO 23718 (see
Chapter 3), GB/T 13634 replaced ISO 376 (see Appendix A), GB/T 24176 replaced ISO 12107 (see Chapter 3,
10.5.4) GB/T 26077 replaces ISO 12106 (see Chapter 3) to adapt to my country's technical conditions and increase operability;
--- Added the requirement that the surface of fatigue specimens should not be polished to a mirror finish [see 7.3.3.2b)] to adapt to my country's technical conditions and increase
Increase operability;
--- Added optional sampling diagrams in the test report (see Chapter 11) to adapt to my country's technical conditions and increase operability.
The following editorial changes have been made to this document.
---The standard name has been changed to adapt to Chinese customs;
--- Figure 3 (see 6.1.1) has been re-edited in accordance with my country's cartographic standards;
--- To meet the needs, the chapters are divided into paragraphs;
--- Added the description of F (see A.4.5.1).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. China Steel Research Institute Nake Testing Technology Co., Ltd., Shenzhen Wanchuang Testing Equipment Co., Ltd., Dongfang Electric Corporation
Fang Steam Turbine Co., Ltd., Zhejiang National Inspection Technology Co., Ltd., Zhonggang Stainless Steel Pipe Technology Shanxi Co., Ltd., National Standard (Beijing)
Inspection and Certification Co., Ltd., Suzhou Thermal Engineering Research Institute Co., Ltd., and Metallurgical Industry Information Standards Research Institute.
The main drafters of this document are. Gao Yifei, Yao Xinzhe, Huang Xing, Gong Xiufang, Sun Guofeng, Hou Huining, Wu Lihua, Wu Lei, Chen Zhilin, Ji Changbing,
Zhou Xu, Dong Li, Zhai Beilei, Liu Yuejiao, Xia Xianxi, Li Qingsong, Guo Bicheng, Xing Bowen, and Dong Haitao.
The previous versions of this document and the documents it replaces are as follows.
---First published in 1984 as GB/T 4337-1984;
---In the first revision in.2008, GB/T 2107-1980 "Metals High Temperature Rotary Bending Fatigue Test Method", GB/T 7733-
1987 "Methods for testing metals by rotating bending corrosion fatigue";
---Second revision in.2015;
---This is the third revision.
Rotational bending method for fatigue testing of metallic materials
Warning. Personnel using this document should have practical experience in regular laboratory work. This document does not address all possible safety issues.
Users are responsible for taking appropriate safety and health measures and ensuring that the conditions stipulated by relevant national laws and regulations are met.
1 Scope
This document specifies the principles of the rotating bending fatigue test method for metallic materials, the shape and size of the specimen, specimen preparation, and test equipment.
Accuracy, heating devices and temperature measuring devices, test procedures, test reports, expression of test results and measurement uncertainty.
This document is applicable to fatigue tests of metallic materials conducted under the conditions of rotating bending of specimens in room temperature or high temperature air.
The rotating bending fatigue test under corrosion (temperature) shall be carried out in accordance with this document.
This document does not cover fatigue testing of notched specimens, as the shape and dimensions of notched specimens have not been standardized. However, the
The fatigue test procedure can also be applied to fatigue testing of notched specimens.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 3075 Metallic materials – Axial force control method for fatigue testing (GB/T 3075-2021, ISO 1099.2017, MOD)
GB/T 10623 Metallic Materials - Mechanical Properties - Test Terminology (GB/T 10623-2008, ISO 23718.2007, MOD)
GB/T 13634 Calibration of dynamometers for testing machines (GB/T 13634-2019, ISO 376.2011, IDT)
GB/T 24176 Statistical scheme and analysis method for fatigue test data of metallic materials (GB/T 24176-2009, ISO 12107.
2003, IDT)
GB/T 26077 Axial strain control method for fatigue testing of metallic materials (GB/T 26077-2021, ISO 12106.2017,
MOD)
3 Terms and Definitions
The terms and definitions defined in GB/T 3075, GB/T 10623, GB/T 24176 and GB/T 26077 and the following terms and definitions apply to this
document.
3.1
fatigue
The process of performance change of metal materials causing cracks or failure under alternating stress or strain.
3.2
Fatigue life fatigue life
Nf
The actual number of cycles to reach fatigue failure criterion.
3.3
SN curve S-Ndiagram
Stress-life curve.
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