高温水中におけるNi含有13Crマルテンサイト系ステンレス鋼の応力腐食割れ

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  • Stress Corrosion Cracking of Nickel Containing 13Cr Martensitic Stainless Steels in High Temperature-High Purity Water
  • コウオンスイチュウ ニ オケル Ni ガンユウ 13Cr マルテンサイトケイ

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Stress corrosion cracking behavior of nickel containing 13Cr martensitic stainless steels was examined in high temperature-high purity water. Nickel content was varied from 0 to 5.7wt%, while carbon content was varied from 0.024 to 0.31wt%. The steels were tested under slow strain rate test (SSRT) conditions in high purity water of 8ppm dissolved oxygen (DO) in the temperature range of 50-288°C. SCC susceptibility peaks at temperature of 150-250°C. This may be ascribed to chemical stability of the surface film formed in this temperature range, being independent of cracking forms such as active path corrosion (APC) type and hydrogen embrittlement (HE). Active path corrosion type cracking tends to initiate at corrosion pits on the free surface, while seldom occurs in the crevice and inside the casting defects. This may be owing to the fact that APC susceptible potential lies in a rather noble potential range such that the free surface shows. Furthermore HE does not occur even when the corrosion potential of the creviced surface reaches hydrogen reduction potential unless stress concentration or film breakdown is induced by pitting. Thus HE susceptibility does not appear to increase. Low Ni and C containing steel subjected to high temperature tempering is immune to SCC and this steel may be concluded to be highly resistant to SCC judging from severe stress conditions given under SSRT conditions.

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