硫化水素によるステンレス鋼の応力腐食割れについて

概要

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Summary: Some troubles by hydrogen sulfide stress crrosion cracking of austenitic stainless steels have occurred in Japanese refineries. We studied the stress corrosion cracking and revealed some interesting results as follows. The cracking is affected by stress including stress concentration and residual stress. Cracking threshold stress is very high, and is assumed to be about 100kg/mm2.The cracking is affected by environmental conditions such as hydrogen sulfide partial pressure and temperature.For instance, a fail-safe limit line for SUS 304 is 80°C for hydrogen sulfide partial pressure of 1.5kg/cm2, and140°C for hydrogen sulfide pressure of 0.5kg/cm2 or under. Acidic contaminants and ammonium chloride act as cracking accelelators. And the cracking varies depending upon the kind of steel. Cracking sensitivity becomes lower according to increase in nickel content. For instance, the sensitivity becomes lower in the order of SUS304→SUS321→SUS316→SUS310.
公益社団法人石油学会の論文