Abstract
In recent years, the problem of sulfide corrosion cracking of weldable high-strength structural steel in the oil refining field has been regarded as important. In this experiment, using the bent-beam system, the susceptibility to sulfide corrosion cracking in each grade steel was investigated. It appeared that susceptibility to sulfide corrosion cracking was mainly related to material strength, and that the rate of crack initiation depended on the H2S concentration in a corrosion medium and the stress applied to the material. The correlation between the lower limit of H2S concentration and the lower limit of stress for crack initiation was investigated in each kind of the steel. Types of cracking observed in the specimen were corrosion cracks on the specimen surface, hydrogen blister, and hydrogen cracks.
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