Sintered molded part comprises carbon, chromium, nickel, molybdenum, manganese, silicon, at least one of cobalt, titanium, niobium, vanadium or tungsten, sulfur, and iron including production related impurities

摘要

Sintered molded part comprises 0.2-0.7 wt.% of carbon, 13-19 wt.% of chromium, 5-19 wt.% of nickel, 1-3 wt.% of molybdenum, 0-2 wt.% of manganese, 0-5 wt.% of silicon, 0-3 wt.% of at least one of cobalt, titanium, niobium, vanadium or tungsten, 0-0.2 wt.% of sulfur, and remaining amount of iron including production related impurities. An independent claim is also included for producing the sintered molded part over a carbide low structure, comprising (a) providing a powdery mixture of 0.2-0.7 wt.% of carbon, 13-19 wt.% of chromium, 5-19 wt.% of nickel, 1-3 wt.% of molybdenum, 0-2 wt.% of manganese, 0-5 wt.% of silicon, 0-3 wt.% of at least one of cobalt, titanium, niobium, vanadium or tungsten, 0-0.2 wt.% of sulfur, and remaining amount of iron including production related impurities, optionally with the addition of an organic binder and pressing agent in water and/or organic solvents for preparing a homogeneous powder suspension, (b) optionally preparing a powder granule from the powder suspension, (c) compressing the powder granules into a green body high density, (d) sintering the resultant green body in vacuum or under protective gas at 1250-1350[deg] C depending on the chromium content for at least 30 minutes, and (e) subsequently cooling to 800-900[deg] C, maintaining at this temperature for 30 minutes and subsequently cooling to less than 400[deg] C.