This standard specifies the equipment, samples, test procedures, treatment of test results and test reports for axial constant amplitude low cycle fatigue test of metallic materials. This standard is applicable to low-cycle fatigue tests of metal materials with constant cross-section and funnel-shaped specimens subjected to axial constant-amplitude stress or strain, excluding tests of full-scale components and structural components. Suitable for temperatures and strain rates where the time-dependent inelastic strain is small or comparable to the time-independent inelastic strain. It is allowed to conduct tests under environmental factors such as temperature, pressure, humidity, medium, etc., but these factors should remain constant throughout the test process.