含窒素 25%Cr-28%Ni-2%Mo 耐熱鋼の高温強度におよぼす V, W および B の影響

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On the 25%Cr-28%Ni-2%Mo austenitic heat-resisting steel containing up to 0.67% nitrogen, 2% vanadium, 5.7% wolfram, and 0.05% boron, the high temperature strengths were investigated by tensile creep rupture testing and short time tensile testing, and the correspondence of these properties with the microstructure of the steel was discussed. Addition of nitrogen to the steel containing vanadium and boron increases not only the short time tensile strength at the temperature up to 700℃, but also remarkably the 1000 hr rupture strength at 700℃. The 25%Cr-28%Ni-2%Mo steel, added with nitrogen, wolfram, and boron, has showed the most excellent creep rupture strength in the range of the present work that was carried out at both the temperature of 700℃ and 800℃ ; for example, the steel containing 5.7% wolfram, 0.05% boron, and 0.67% nitrogen has showed 26.5kg/mm^2 of 1000 hr rupture strength at 700℃. Further, in the lower range of nitrogen content, the 700℃-1000 hr rupture strength of the steel was increased by about 9kg/mm^2 due to the addition of 5% wolfram and 0.05% boron, and this value corresponds to about 100% increase of the strength comparing to that of wolfram-boron free steel. With addition of boron to this type of steel, the high temperature ductilities have been improved remarkably, but the creep rupture strength has not so much.
社団法人日本鉄鋼協会の論文
1971-03-01