高温純水中における 18-8 系オーステナイトステンレス鋼溶接部の応力腐食割れ

概要

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Stress corrosion cracking (SCC) behavior of several commercial 18-8 stainless steels (SUS 304, 304L, 304ELC, 321, and 347) in high temperature deionized water, has been studied in connection with microstructures on the welded joints with various heat inputs using double U-bend specimens. The influence of cooling time and prestrain at the welding on SCC was also investigated on SUS 304 heat treated to simulate the welding thermal cycle. Besides, the correlation between the susceptibility to intergranular stress corrosion cracking (IGSCC) and the susceptibility to intergranular corrosion in the Strauss solution was investigated on the weldments of these steels. Both deep IGSCC and shallow transgranular stress corrosion cracking (TGSCC) were recognized. The IGSCC was observed in the heat affected zone of SUS 304 weldment with high heat input (Ca. 25000 Joule/cm) and SUS 321 weldment with any heat input (10000∿25000 Joule/cm). Although the weldments of SUS 304L, 304ELC, and 347 were immume to IGSCC, they were susceptible to TGSCC. It was concluded that reducing the carbon content in steel was most beneficial to prevent the IGSCC irrespective of non-stabilized and stabilized steel but this was not an effective means to prevent the TGSCC in high temperature deionized water.
社団法人日本鉄鋼協会の論文
1981-09-01