Test method for measurement of hydrogen embrittlement threshold in steel by the incremental step loading method
1 Scope
This standard specifies the symbols and definitions, principle, test apparatus, specimens, test procedure and test report for measuring the threshold stress and threshold stress intensity of hydrogen embrittlement in steel by incremental step loading method.
This standard is applicable to evaluate quantitatively the hydrogen embrittlement susceptibility of steel, or the effect of residual hydrogen in steel as a result of processing, such as melting, thermal mechanical working, surface treatments, etc., and of hydrogen introduced by external environmental sources on the steel properties.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 228 Metallic materials—Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 4161 Metallic materials—Determination of plane-strain fracture toughness (GB/T 4161-2007, IS0 12737:2005, MOD)
GB/T 15970.7 Corrosion of metals and alloys—Stress corrosion testing—Part 7: Slow strain rate testing (GB/T 15970.7-2000, idt ISO 7539-7:1989)
GB/T 16825.1 Verification of static uniaxial testing machines—Part 1: Tension/ compression testing machines—Verification and calibration of the force measuring system (GB/T 16825.1-2008, ISO 7500-1:2004, IDT)
3 Symbols and definitions
The symbols used in this standard and the corresponding definitions are shown in Table 1.
