摘要:
A method of producing forged article by casting a molten alloy steel containing 0.02 to 0.15 wt % of niobium and 9 to 12 wt % of chromium in a metal mold to form an ingot and subjecting the ingot to a forging. The ingot is formed to have a diameter greater than the height thereby to prevent generation of eutectic NbC and sedimental crystals.
摘要:
A heat resisting steel whose metal structure is entirely martensite phase produced by tempering after quenching. The steel comprises, by weight, 0.05 to 0.20% C, not more than 0.15% Si, not more than 1.5% Mn, not more than 1.0% Ni, 8.5 to 13.0% Cr, not more than 3.50% Mo, not more than 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, not more than 5.0% Co, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen and 0.00001 to 0.0002% hydrogen. The steel has preferably not more than 10 of the Cr equivalent. The steel has 10 kgf/mm.sup.2 or more of 100,000 hours creep rupture strength at 650.degree. C.
摘要翻译:淬火后通过回火生产金属结构完全是马氏体相的耐热钢。 该钢包含0.05〜0.20%的C,不大于0.15%的Si,不超过1.5%的Mn,不超过1.0%的Ni,8.5〜13.0%的Cr,不大于3.50%的Mo,不大于 3.5%W,0.05〜0.30%V,0.01〜0.20%Nb,5.0%以下的Co,0.001〜0.020%的硼,0.005〜0.040%的氮,0.0005〜0.0050%的氧和0.00001〜0.0002%的氢。 钢优选不超过10当量的Cr当量。 该钢在650℃下具有10kgf / mm 2以上的100,000小时蠕变断裂强度