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    • 9. 发明申请
    • METHOD OF MANUFACTURING MARTENSITIC STAINLESS STEEL
    • 制造不锈钢不锈钢的方法
    • US20110067785A1
    • 2011-03-24
    • US12952471
    • 2010-11-23
    • Nobuyuki MORI
    • Nobuyuki MORI
    • C21D11/00
    • C21D6/002C21D1/32C21D9/08C21D9/085C21D2211/008C22C38/02C22C38/04C22C38/18
    • The occurrence of delayed fracture which is found in a hot worked martensitic stainless steel is prevented by subjecting the steel, after hot working and prior to heat treatment for hardening by quenching from a temperature of at least Ac1 point of the steel, to preliminary softening heat treatment under such conditions that the softening parameter P defined below is at least 15,400 and the softening temperature T is lower than the Ac1 point: P(softening parameter):P=T(20+log t) T: softening temperature [K] t: duration of softening treatment [Hr]. The present invention is particularly effective for a martensitic stainless steel having a steel composition in which the amount of effective dissolved C and N (=[C*+10N*]) where C* and N* are calculated by the following formulas is larger than 0.45: C*=C−[12{(Cr/52)×(6/23)}/10, and N*=N−[14{(V/51)+(Nb/93)}/10]−[14{(Ti/48)+(B/11)+(Al/27)}/10].
    • 在热加工马氏体系不锈钢中发现的延迟断裂的发生是通过将钢从热处理之后经过淬火从钢的至少Ac1点的淬火淬火至初始软化热来防止的 在以下定义的软化参数P为至少15,400,软化温度T低于Ac1点的条件下处理:P(软化参数):P = T(20 + log t)T:软化温度[K] :软化处理持续时间[Hr]。 本发明对于其中C *和N *通过下式计算的有效溶解C和N(= [C * + 10N *])的量的钢组成的马氏体不锈钢特别有效, 0.45:C * = C- [12 {(Cr / 52)×(6/23)} / 10,N * = N- [14 {(V / 51)+(Nb / 93)} / 10] [14 {(Ti / 48)+(B / 11)+(Al / 27)} / 10]。