高硬度13Crマルテンサイト系ステンレス鋼の水素脆化割れ感受性に及ぼす環境条件の役割

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  • Role of Environmental Conditions on Hydrogen Embrittlement of a 13Cr Martensitic Stainless Steel
  • コウ コウド 13Cr マルテンサイトケイ ステンレス コウ ノ スイソ ゼイ

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Hydrogen embrittlement susceptibility of a 13Cr martensitic stainless steel of 495 in Vickers hardness is investigated in chloride solutions of 20-20000ppm Cl- with pH of 3-7 at 20-80°C by means of slow strain rate test (SSRT) and constant load SCC test. HE susceptibility is found to increase with aggressiveness of the environment and no crack initiates in mild environment unless localized corrosion occurs. In the mild environment HE susceptibility depends on temperature, pH and chloride concentration. On the other hand HE susceptibility in the severe environment is determinedsolely by temperature. This may suggest that the composition of the solution inside the localized corrosion pit which serves as the crack initiation site is almost independent of the composition of the bulk solution and its aggressiveness is governed mainly by temperature. A simple electrochemical modeling indicates that HE susceptibility is determined by hydrogen reduction rate in the steel surface. Furthermore a good correlation between HE susceptibility evaluated under SSRT and that under constant load test may lead to a conclusion that SSRT test is valid for evaluation of HE susceptibility of the steel and environment examined here. Consequently HE preventive measures are suggested.

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