The Effect of Tempering Temperature on Susceptibility to Hydrogen Embrittlement of Chromium Molybdenum Steel

Abstract

The purpose of the present study is to investigate the effects of heat treatment on the hydrogen embrittlement of chromium molybdenum steel containing O．35％C，1．05％ Cr and O．15％Mo． The

Effects of the Addition of Alloying Elements on Hydrogen Diffusion and Hydrogen Embrittlement in Martensitic Steel

“…In the steels investigated in this study, precipitated carbides are estimated to be mainly Fe 3 C, which was reported to exhibit hydrogen-trapping features. 30) Additionally, tempering heat treatments performed at temperatures beyond 600°C were reported to remarkably increase D. 28) Therefore, tempering heat treatment at temperatures over 600°C is estimated to affect D in the investigated steels in this study.…”

“…Tsutsui et al reported that the D of Japanese Industrial Standard SCM435 -which contains mass percentages of 0.2% C, 0.75% Mn, 1% Cr and 0.15% Mo -increased with increasing tempering temperatures. 28) They revealed that D of SCM435 is 6 × 10 − 7 and 2 × 10 − 6 (cm 2 /s) at tempering temperatures of 200°C and 600°C, respectively. Although data reported by Tsutsui are slightly larger than those of the base steel in this study, because of the difference in the chemical composition, they show a similar tendency.…”