Patent ID: 8440136

Claim:
A powder metallurgically manufactured martensitic steel consisting of, in % by weight: 0.13-0.8 C ≦1.0 Si 0.2-2.0 Mn 18-30 Cr ≦3.0 Ni 0.01-3.5 Mo 0.01-4.0 (Mo+W/2) ≦5.0 Co ≦0.5 S 1.7-6.5 N ≦7.0 (Ti+Zr+Al) 2.0-11.0 V ≦2.0 Nb 2.0-11.0 (V+Nb/2), balance of iron and impurities at normal amounts, wherein N and (V+Nb/2) are balanced in relation to each other such that contents of these elements are within an area defined by the coordinates J, E, E′″, J′″, J in the system of coordinates in FIG. 1 , where the coordinates of [N, (V+Nb/2)] for J, E, E′″, J′″, and J are: J: [1.1, 1.5] E: [1.9, 1.5] E′″: [6.5, 11.0] J′″: [3.5, 11.0], wherein the steel, at an austenitizing temperature (T A ), has a calculated PRE of 19.8-31.1, wherein PRE=Cr+3.3 Mo+20 N and Cr, Mo, and N are the calculated equilibrium contents dissolved in the matrix at T A , wherein the chromium content dissolved in the austenite is at least 16 wt.-%, wherein the total content of MX, M 2 X, M 23 C 6 , and M 7 C 3 does not exceed 50 vol.-%, wherein M is a metal and X is at least one of carbon and nitrogen, and wherein the content of carbides, nitrides, and/or carbonitrides are, in % by volume: 5-40 MX ≦10 M 2 × ≦10 M 23 C 6 +M 7 C 3 .