MARTENSITIC STAINLESS STEEL COMPOSITION, PROCESS FOR MANUFACTURING A MECHANICAL PIECE FROM SAID STEEL, AND PART THUS OBTAINED

摘要

Martensitic stainless steel, characterized in that its composition is, in percentages by weight: -9% = Cr = 12.5%; 1.5% = Mo = 3%; 8% = Ni = 14%; 1% = Al = 2%; 0.5% = Ti = 1.5% with Al + Ti = 2.25%; traces = Co = 2%; traces = W = 1% with Mo + (W / 2) = 3%; traces = P = 0.02%; traces = S = 0.0050%; traces = N = 0.0060%; traces = C = 0.025%; = Cu = 0.5%; traces = Mn = 3%; traces = If = 0.25%; traces = B = 0.0050%; traces = 0 ≤ 0.0050%, and is such that: MS (C degree) = 1302 - 42Cr - 63Ni - 30Mo + 30Al - 1667 (C + N) -15W - 33Mn - 28Si - 30Cu - 13Co + 15Ti = 100. (Cr eq) 1 / (Ni eq) 1 = 1.10 WITH (CR EQ) 1 (%) = Cr + 2Si + Mo + 1.5Ti + 5.5Al + 0.6W (Ni eq) 1 / (%) = 2Ni + 0.5Mn + 30C + 25N + Co + 0.3Cu. (Cr eq) 2 / (Ni eq) 2 = 2 with (Cr eq) 2 = Cr + 1,5Si + 1,37Mo + 3Ti + 2Nb + 5Al + 0,8W (Ni eq) 2 = Ni + 22C + 14 , 2N + 0.31 Mn + Cu + 0.26Co.Process of manufacturing a mechanical part using this steel, and part thus obtained.