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    • 7. 发明授权
    • Ferritic heat-resistant steel having excellent high temperature strength
and process for producing the same
    • 具有优异的高温强度的铁素体耐热钢及其制造方法
    • US6136110A
    • 2000-10-24
    • US836446
    • 1997-08-18
    • Katsukuni HashimotoHiroyuki MimuraTakashi SatoKohji TamuraToshio Fujita
    • Katsukuni HashimotoHiroyuki MimuraTakashi SatoKohji TamuraToshio Fujita
    • C21D6/00C22C38/00C22C38/22C22C38/24C22C38/32C21D6/02
    • C22C38/32C22C38/22C22C38/24
    • This invention provides a ferritic heat-resistant steel suitable for a pressure-resistant member to be used at a temperature of 400 to 550.degree. C. The ferritic heat-resistant steel having an excellent high temperature strength contains, in terms of wt %, 0.05 to 0.15% of C, 0.10 to 0.08% of Si, 0.20 to 1.5% of Mn, 0.5 to 1.5% of Cr, 0.10 to 1.15% of Mo, 0.005 to 0.30% of V, 0.005 to 0.05% of Nb, 0.0002 to 0.0050% of B, and if necessary, 0.005 to 0.05% of Ti and 0.4 to 1.0% of W, either alone or in combination, and having a structure comprising not greater than 15% of pro-eutectoid ferrite, in terms of a metallic structural area ratio, and the balance of bainite. The present invention provides also a process for producing a ferritic heat-resistant steel having an excellent high temperature strength, comprising tempering the steel having the composition at a temperature within the range 950 to 1,010.degree. C., and conducting tempering while keeping a T.P. value within the range of 18.50.times.10.sup.3 to 19.90.times.10.sup.3.
    • PCT No.PCT / JP96 / 02249 Sec。 371日期:1997年8月18日 102(e)日期1997年8月18日PCT提交1995年11月2日PCT公布。 出版物WO96 / 14445 日期1996年5月17日本发明提供一种适用于在400-550℃的温度下使用的耐压构件的铁素体耐热钢。具有优异的高温强度的铁素体耐热钢包含以下 ,0.05〜0.15%的C,0.10〜0.08%的Si,0.20〜1.5%的Mn,0.5〜1.5%的Cr,0.10〜1.15%的Mo,0.005〜0.30%的V,0.005〜 Nb,0.0002〜0.0050%的B,如果需要,0.005〜0.05%的Ti和0.4〜1.0%的W,单独或组合,并且具有不大于15%的共析共析铁素体的结构, 金属结构面积比的术语,以及贝氏体的平衡。 本发明还提供一种具有优异的高温强度的铁素体系耐热钢的制造方法,其特征在于,将组成在950〜1010℃的温度范围内进行回火,同时保持T.P。 值在18.50×103〜19.90×103的范围内。