高 Mo オーステナイト系ステンレス鋼の熱間加工性におよぼす Ni, B の影響

概要

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Effects of Ni content and B addition on the hot workability of austenitic stainless steels containing 4.5∿6.2%Mo for sea water applications have been investigated by hot tensile tests and physical analyses of fractured surfaces. Optimum Ni contents were 22% for 25Cr-4.5Mo steel and 17% for 20Cr-6.2Mo steel respectively, since 3∿4% δ ferrite remaining in the solidification structure was effective to improve the ductility at temperatures between 1000℃ and 1150℃. The addition of 0.002∿0.004% B was also effective in the improvement of hot workability of the steels containing δ ferrite less than 4%. It was clarified by Auger Electron Spectrometer and Ion Micro Analyser that the hot workability was greatly affected by the degree of S segregation at grain boundaries, which could be decreased by the existence of small amount of δ ferrite and the segregation of B at grain boundaries.
社団法人日本鉄鋼協会の論文
1992-10-01