Steel with High Wear Resistance, Hardness and Corrosion Resistance as well as Low Thermal Conductivity

Abstract

This invention relates to a steel having high wear resistance, a high degree of hardness, good corrosion resistance and/or low thermal conductivity. A hardness of a steel is at least 56 HRC in a hardened state. In order to obtain this hardness, in a microstructure of the steel in total at least 30% wt. of hard phases are present which in addition to TiC particles include further carbide particles, oxide particles or nitride particles. Content of the TiC particles in the steel is at least 20% wt. The hard-phase particles are embedded in a matrix which includes (in % wt.) 9.0-15.0% Cr, 5.0-9.0% Mo, 3.0-7.0% Ni, 6.0-11.0% Co, 0.3-1.5% Cu, 0.1-2.0% Ti, 0.1-2.0% Al, the remainder being iron and unavoidable impurities.

1 .- 18 . (canceled) 
     
     
         19 . A steel having high wear resistance, a high degree of hardness, good corrosion resistance and/or low thermal conductivity,
 wherein the steel has a hardness of at least 56 HRC in a hardened state,   wherein in a microstructure of the steel in total at least 30% wt. of hard phases are present which in addition to TiC particles include further carbide particles, oxide particles or nitride particles,   wherein a content of TiC particles is at least 20% wt. and 2-4.5% wt. of NbC particles are present,   and   wherein the hard phases are embedded in a matrix which consists (in % wt.) of
 9.0-15.0% Cr, 
 5.0-9.0% Mo, 
 3.0-7.0% Ni, 
 6.0-11.0% Co, 
 0.3-1.5% Cu, 
 0.1-2.0% Ti, 
 0.1-2.0% Al, and 
 a remainder being iron and unavoidable impurities. 
   
     
     
         20 . The steel according to  claim 19 , herein its Cr content is 12.5-14.5% wt. 
     
     
         21 . The steel according to  claim 19 , wherein its Mo content is 6.5-7.5% wt. 
     
     
         22 . The steel according to  claim 19 , wherein its Ni content is 4.5-5.5% wt. 
     
     
         23 . The steel according to  claim 19 , wherein its Co content is 8-10% wt. 
     
     
         24 . The steel according to  claim 19 , wherein its Cu content is 0.5-1.0% wt. 
     
     
         25 . The steel according to  claim 19 , wherein its Ti content is 0.8-1.2% wt. 
     
     
         26 . The steel according to  claim 19 , wherein its Al content is 1.0-1.4% wt. 
     
     
         27 . The steel according to  claim 19 , wherein its TiC content is at most 45% wt. 
     
     
         28 . The steel according to  claim 19 , wherein the steel is produced by powder metallurgy.