适用环境：由于选用材料经过特殊的表面处理，可在强腐蚀环境下正常工作。在- 60度严寒或150度高温下正常工作。
Application environment: because of the special surface treatment, the material can be used in strong corrosive environment. In -60 degree or 150 degree of normal work under high temperature.
本文对921A钢焊接接头在海水腐蚀环境下受弯曲疲劳载菏作用时表面裂纹扩展规律进行了试验研究。
The propagation of surface cracks in welded connections made of type "921A" steel has been investigated experimentally under bending fatigue load and in the corrosive environment of seawater.
表面裂纹萌生原因是拉杆在腐蚀性高炉煤气粉尘和轴向拉伸等工作应力的综合作用下，形成的应力腐蚀裂纹。
The initiation of the cracks was caused by stress corrosion resulting from the co-effect of the corrosive gas dust and the axial tensile stress.
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