| 摘要 |
A martensitic stainless steel is provided, wherein its composition is:
trace amounts≦C≦0.030%;trace amounts≦Si≦0.25%;trace amounts≦Mn≦0.25%;trace amounts≦S≦0.020%;trace amounts≦P≦0.040%;8%≦Ni≦14%;8%≦Cr≦14%;1.5%≦Mo+W/2≦3.0%;1.0%≦Al≦2.0%;0.5%≦Ti≦2.0%;2%≦Co≦9%;trace amounts≦N≦0.030%;trace amounts≦O≦0.020%;the remainder being iron and impurities resulting from the steelmaking;and its martensitic transformation beginning temperature Ms is calculated by the formula;Ms (° C.)=1302−28Si−50Mn−63Ni−42Cr−30Mo+20Al−12Co−25Cu+10[Ti−4(C+N)] (1)wherein the contents of the various elements are expressed in weight percentages, is greater than or equal to 50° C., preferably greater than or equal to 75° C. A part made in this steel and its manufacturing method are also provided. |
