窒素を含有する 18Cr-12Ni-3Mo 系オーステナイト耐熱鋼のクリープ破断強さ

概要

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In order to develop the high strength heat resisting steel served at temperatures above 600℃, the effects of C and Nb contents and heat treatment on creep rupture strength of 18Cr-12Ni-3Mo austenitic steel containing 0.15%N were investigated. Creep rupture strength was given as a function of Nb/(C+N) (atomic per cent ratio) irrespective of C and Nb contents and reached maximum at Nb/(C+N)=0.3∿0.5. Moreover, creep rupture strength increased with increasing solution treatment temperature, which was due to the solid solution hardening of Nb(C, N) and the grain growth of austenite. As results, the steel with nominal composition of C 0.1, Si 0.8, Mn 1.5, Cr 18, Ni 12, Mo 3, Nb 0.7, N 0.15, B 0.02% was developed. 10000 hr creep rupture strength of this steel was 20 kg/mm^2 at 650℃, 13.5 kg/mm^2 at 700℃ and 9.8 kg/mm^2 at 750℃. It was concluded that this favourable creep rupture strength for long time up to 750℃ is mainly due to the excellent structural stability.
社団法人日本鉄鋼協会の論文
1969-02-01