| 摘要 |
This invention concerns a martensitic-austentitic steel consisting essentially (in wt%) of: 8 to 15 % chromium, 0.5 to 2.5 % molybdenum, up to 2 % tungsten, 4 to 10 % cobalt, 0.5 to 6 % nickel, 2.5 to 8 % manganese, 0.1 to 1.0 % vanadium 0.05 to 0,25 % nitrogen, up to 0.2 % carbon, the rest being iron with impurities. This martensi tic-austentitic steel can be used, in particular, as material for rotors or rotor disks in gas turbines operating at temperatures above above 450 .degree.C. The adjustment of the two phase martensitic-austentitic structure is done by heat treatment of the solution annealed and quenched steel structure in a temperature range between 550 .degree.C and 650 .degree.C.
|
