The changes of mechanical properties, fatigue properties and fracture toughness have been studied for 20G、15CrMo and 2.25Cr-1Mo steels exposed to dydrogen gas under 18MPa at 300℃, 350℃, 400℃, 480℃ for 120h, 240h, 480h. The structures and fracture surfaces have been observed and analyzed. The results showed that the reduction of mechanical properties for 20G steel resulted from decreasing of pearlite amount andexisting of crazes caused by hydrogen attact. The 15CrMo and 2.25Cr-1Mo steels showed a lower susceptibility to hydrogen attack due to the action of element Cr and Mo.HA% for hydrogen attack is reasonable.
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