Ferritic martensitic iron based alloy, a component and a process

Abstract

A novel ferritic martensitic alloy is provided. The ferritic martensitic alloy enables the use temperature to be increased from 500° C. to 550° C., where the strength is maintained or is even maximized and the toughness, especially for low temperatures, is maintained compared to the known iron-based alloys. Tunsten is preferably not used.

1 - 33 . (canceled) 
     
     
         34 . An iron-based alloy, comprising (in % by weight):
 carbon 0.13-0.22;   chromium 9.0-9.8;   molybdenum 1.0-2.0;   nickel 0.3-0.8;   vanadium 0.25-0.35;   aluminum 0.005-0.01;   niobium 0.04-0.06;   boron 20 ppm-70 ppm;   nitrogen 150 ppm-500 ppm;   cobalt 0-1.5;   manganese 0-0.15;   silicon 0-0.1;   phosphorus 0-0.005;   sulfur 0-0.003;   arsenic 0-0.015;   tin 0-0.015;   antimony 0-0.015;   copper 0-0.1; and   remainder iron.   
     
     
         35 . The alloy as claimed in  claim 34 , wherein the alloy comprises at most 0.18% by weight carbon. 
     
     
         36 . The alloy as claimed in  claim 34 , wherein the alloy comprises at least 0.18% by weight carbon. 
     
     
         37 . The alloy as claimed in  claim 34 , wherein the alloy comprises at least 9.3% by weight chromium. 
     
     
         38 . The alloy as claimed in  claim 34 , wherein the alloy comprises at most 9.4% by weight chromium. 
     
     
         39 . The alloy as claimed in  claim 34 , wherein the alloy comprises at least 0.5% by weight nickel. 
     
     
         40 . The alloy as claimed in  claim 34 , wherein the alloy comprises at most 0.4% by weight nickel. 
     
     
         41 . The alloy as claimed in  claim 34 , wherein the alloy comprises at least 350 ppm nitrogen. 
     
     
         42 . The alloy as claimed in  claim 34 , wherein the alloy comprises at most 300 ppm nitrogen. 
     
     
         43 . The alloy as claimed in  claim 34 , wherein the alloy comprises cobalt. 
     
     
         44 . The alloy as claimed in  claim 34 , wherein the alloy comprises at least 0.9% by weight cobalt. 
     
     
         45 . The alloy as claimed in  claim 34 , wherein the alloy comprises manganese. 
     
     
         46 . The alloy as claimed in  claim 34 , wherein the alloy comprises no manganese. 
     
     
         47 . The alloy as claimed in  claim 34 , wherein the alloy comprises silicon. 
     
     
         48 . The alloy as claimed in  claim 34 , wherein the alloy comprises no silicon. 
     
     
         49 . The alloy as claimed in  claim 34 , wherein the alloy comprises phosphorus. 
     
     
         50 . The alloy as claimed in  claim 34 , wherein the alloy comprises no phosphorus. 
     
     
         51 . The alloy as claimed in  claim 34 , wherein the alloy comprises sulfur. 
     
     
         52 . The alloy as claimed in  claim 34 , wherein comprises no sulfur. 
     
     
         53 . The alloy as claimed in  claim 34 , wherein the alloy contains no tungsten.