GB/T 4337-2025: Metallic materials - Fatigue testing - Rotating bar bending method

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Scope

This document specifies the principle, specimen shape and dimensions, specimen
preparation, accuracy of testing equipment, heating device and temperature measuring
device, test procedure, test report, expression of test results and measurement
uncertainty of the rotating bar bending method for fatigue testing of metallic materials.
This document applies to fatigue tests of metallic materials under conditions of rotating
bending of specimens at room temperature or in high-temperature air. Rotating bending
fatigue tests under other environments (such as corrosion) shall be performed with
reference to this document.
This document does not include fatigue testing of notched specimens because the shape
and dimensions of notched specimens have not been standardized. However, the fatigue
testing procedures described in this document can also be applied to fatigue testing of
notched specimens.

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	30,356
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Older Standard (superseded by this standard)	GB/T 4337-2015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