2 1/4 Cr-1Mo 耐熱鋼の高温強度の改善

概要

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In order to develop a low alloy heat resistant steel which has a higher creep-rupture strength than that of 2 1/4 Cr-I Mo heat resistant steel, the effects of simultaneous addition of Ta, V, Ti, Co, Nb, and B on creep-rupture strength and oxidation resistance of 2 1/4 Cr-1 Mo steel were investigated. The creep-rupture strength of the steel at 600℃ was improved by simultaneous addition of these elements, which was mainly due to precipitation hardening by V_4C_3 and NbC. The oxidation resistance of the steel at 600°∿700℃ was slightly improved by simultaneous addition of Co, V, Nb, and Ta, but the addition of B was not effective for the improvement of the oxidation resistance. As the result, the steel with nominal composition of 0.15% C, 2% Cr, 1% Mo, 0.4% V, 2% Co, 0.12% Ti, 0.02% Nb, with or without 0.03% B was selected as the best. 10^5hr creep-rupture strength at 600℃ obtained from the master rupture curve of this steel was 11.3kg/mm^2, which was about 2.6 times higher than that of 2 1/4 Cr-1 Mo steel. It was concluded that this favourable creep-rupture strength for long time is mainly due to the excellent structural stability of the steel.
社団法人日本鉄鋼協会の論文
1971-02-01