||Ryosuke Komoda, Masanobu Kubota, Shuichi Yoshida, Aleksandar Tsekov Staykov, Patrick Ginet, Francoise Barbier, Jader Furtado, Inhibition of hydrogen embrittlement of Cr-Mo steel by the addition of impurities to hydrogen environment and the effect of material strength, 28th International Ocean and Polar Engineering Conference, ISOPE 2018, 2018.01, The effect of impurities, added to hydrogen environment, on hydrogen embrittlement (HE) was investigated in association with the effect of material strength. Addition of CO and O2 deactivated the HE. O2 prevented the HE with lower concentration than CO. Material with higher strength required larger amount of impurities to prevent the HE. Reduction of hydrogen uptake was the primary result of the addition of the impurities, but a certain amount of hydrogen uptake occurred when the HE was completely inhibited. Discussion regarding essential HE mechanisms for the fracture morphologies was required to interpret the effect of material strength..