19-9DL 耐熱鋼の性質におよぼす P 添加の影響について(その 2) : 耐熱鋼の性質におよぼす P の影響に関する研究 II

概要

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The effect of phosphorus on properties of 19-9DL type heat-resisting steels with or without addition of boron and rare earth elements was studied. The results obtained were as follows : (1) The phosphorus increased the maximum hardness obtained by aging after water-quenching from 1150℃, and the addition of phosphorus more than 0.2% accelerated overaging at temperatures higher than 750℃. (2) The phosphorus greatly improved the rupture strength at 650℃ and 700℃, but the rupture elongation and impact value was decreased with increasing phosphorus content. Small addition of rare earth elements improved the ductility of the 19-9DL type heat-resisting steel containing 0.15% P, and the stress-rupture values at 650℃ or 700℃ were equivalent to hot-cold-worked 19-9DL heat-resisting steel. (3) Small addition of boron improved the rupture life and ductility of the 19-9DL type heat-resisting steel containing 0.15% P with or without addition of rare earth elements. The new type heat-resisting steel invented by the authors contained 0.3% C, 19% Cr, 9% Ni, 1.5% W, 1.5% Mo, 0.5% Cb, 0.2% Ti, 0.15% P, 0.1% B and 0.3% rare earth elements, and the stress-rupture values at 700℃ were higher than those of the LCN-155 Alloy.
社団法人日本鉄鋼協会の論文
1960-12-01