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    • 10. 发明申请
    • MARTENSITIC STAINLESS STEEL AND METHOD FOR THE MANUFACTURE
    • MARTENSITIC不锈钢及其制造方法
    • WO2018002426A1
    • 2018-01-04
    • PCT/FI2017/050449
    • 2017-06-15
    • OUTOKUMPU OYJ
    • ANTTILA, SeveriKAUPINMÄKI, Tatu
    • C22C38/58C22C38/50C22C38/46C22C38/42C22C38/48C21D9/46C21D6/00
    • C21D9/46C21D6/004C21D6/005C21D8/0247C21D8/0263C22C38/001C22C38/004C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/58
    • The invention relates to a martensitic stainless steel and its manufacturing method having high strength and enhanced tensile ductility. The steel consists of in weight % equal or less than 0.05 % C, equal or less than 1.0 % Si, 2.0 – 5 8.0 % Mn, 10.5 – 18.0 % Cr, 0.4 – less than 4.0 % Ni, equal or less than 1.5 % Mo, equal or less than 1.0 % Cu, equal or less than 0.05 % N, equal or less than 0.1 % Al, optionally at least one of the following group containing equal or less than 0.8 % Ti, equal or less than 0.8 % Nb, equal or less than 0.8% Zr, equal or less than 0.8 % V, the rest being iron and evitable impurities occupying 10 in stainless steels in such conditions, that the Ductility Index (DI) = γcomp - 0.03 * Ms ≥0 where γcomp = 54.7 - 432 * (C+N) FCC - 6.43 * Si FCC - 0.603 * Mn FCC - 2.572 * Cr FCC - 0.818 * Ni FCC - 0.157 * HJ, HJ = T * (c + log10 t) / 1000 and 15 T is temperature in degrees Kelvin and c is a constant, when the Ms temperature is at the range of 50 – 350°C.
    • 本发明涉及具有高强度和增强的拉伸延展性的马氏体不锈钢及其制造方法。 钢由重量百分比等于或小于0.05%的C,等于或小于1.0%的Si,2.0-5.8%的Mn,10.5-18.0%的Cr,0.4-小于4.0%的Ni,等于或小于1.5% 的Mo,等于或小于1.0%的Cu,等于或小于0.05%的N,等于或小于0.1%的Al,任选的至少一种含有等于或小于0.8%的Ti,等于或小于0.8%的Nb ,等于或小于0.8%的Zr,等于或小于0.8%的V,其余为铁和在不锈钢中占据10的不可避免的杂质,延展性指数(DI)=γcomp-0.03 *Ms≥0其中γcomp = 54.7-432 *(C + N)FCC-6.43 * Si-FCC-0.603 * Mn-FCC FCC-2.572 * Cr-FCC -0.818 * Ni·FCC-0.157 * HJ,HJ = T *(c + log 10 t)/ 1000和15 T是以开尔文度表示的温度,并且c是常数,当Ms 温度在50-350℃的范围内。