Abstract
Fitness for service of pressure vessels used under hydrogen environment is affected by hydrogen assisted cracking (HAC). In order to improve HLF (holding-load and fractography) test and RL (rising load) test for measuring the lower-bound stress intensity factor K_<IH> for HAC, RLF (partially loaded RL and fractography) and Slow-HLF (slow RL before HLF), PS-RLF (pre-straining before RLF) tests were conducted and the values of K_<IH> by these tests were compared. It was shown that K_<IH> by Slow-HLF method was lowest and the method was most sensitive for measuring characteristics of HAC.
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