The results showed that strength, ductility and fracture toughness were lowered caused by hydrogen attack for Cr-Mo steel. The fracture mechanism was changed from dimple fracture surface to embri-ttlement by hydrogen attack.

• 结果表明:Cr-Mo钢已经发生了氢腐蚀；氢蚀使Cr-Mo钢强度、塑性和断裂韧性均有所降低；也使断裂机制由韧窝型转变为解理脆性.