Patent ID: 8440136
Filing Date: 2013-05-14
Classification: B22F,B26B,C22C

Abstract:
1. 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 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 wherein the chromium content dissolved in the austenite is at least 16 wt.-%, wherein the total content of MX, M 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 ≦10 M