V, Nb 添加 9Cr-2Mo 耐熱鋼の高温強度と靭性におよぼす C 量の影響

概要

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The effect of carbon on creep rupture properties and room-temperature toughness of (9∿10)Cr(1.8∿2)Mo heat resisting steels with V and Nb was studied. The amount of carbon content was varied from 0.02% to 0.23% in order to improve toughness without decrease in creep rupture strength. The difference in creep rupture strength and Charpy absorbed energy between 10Cr-2Mo steels and 9Cr-1.8Mo steels was studied with respect to the ratio of δ-ferrite to martensite, the precipitates, and the microstructure. The results indicated that the 9Cr-1.8Mo-0.1V-0.05Nb steels with 0.05∿0.14%C tempered at 800℃ showed good toughness, and that 10^4h rupture strength of the steel was as high as that of SUS 316 at 550℃. and SUS 304 austenitic stainless steel at 600℃. It was concluded that the optimum amount of δ-ferrite with respect to both creep rupture strength and Charpy absorbed energy was 10∿20%.
社団法人日本鉄鋼協会の論文
1983-12-01