Temperature stable cast-iron alloy and its use

Abstract

A description is given of a temperature-stable cast-iron alloy having high wear resistance at temperatures between 500 and 900° C. The alloy is characterized in that it has the following composition expressed in weight percentages: chromium: 15.0-20.0%, carbon: 1.0-2.0%, manganese: 1.5-2.0%, silicon: 0.8-1.2%, nickel: 8.0-10.0%, molybdenum: 0.8-1.2% balance iron and unavoidable metallic and non-metallic contaminants where the non-metallic contaminants comprise nitrogen, oxygen, phosphorous and sulphur. Hereby is obtained a cast-iron alloy which has a higher wear resistance and a reduced tendency to form the undesirable sigma phase when heated to temperatures between 500 and 900 ° C. as compared to the known allows.

1 . Temperature-stable cast-iron alloy having high wear resistance at temperatures between 500-900° C. comprising the following composition expressed in weight percentages:
 chromium: 15.0-20.0%, 
 carbon: 1.0-2.0%, 
 manganese: 1.5-2.0%, 
 silicon: 0.8-1.2%, 
 nickel: 8.0-10.0%, 
 molybdenum: 0.8-1.2% 
 balance iron and unavoidable metallic and non-metallic contaminants where the non-metallic contaminants comprise nitrogen, oxygen, phosphorous and sulphur. 
 
     
     
         2 . Temperature-stable cast-iron alloy according to  claim 1 , comprising 16.5-19.5 weight percentage chromium. 
     
     
         3 . Temperature-stable cast-iron alloy according to  claim 2 , comprising 17.0-19.0 weight percentage chromium. 
     
     
         4 . Temperature-stable cast-iron alloy according to  claim 3 , comprising 1.25-1.85 weight percentage carbon. 
     
     
         5 . Temperature-stable cast-iron alloy according to  claim 4 , comprising 1.5-1.7 weight percentage carbon. 
     
     
         6 . Temperature-stable cast-iron alloy according to  claim 1 , wherein the alloy is in the form of an austenitic matrix. 
     
     
         7 . A method comprising the step of cooling cement clinker in a clinker cooler by contacting cement clinker with a machine part in the clinker cooler at a temperature of from 500 to 900° C., the machine part being formed from a cast-iron alloy comprising the following composition expressed in weight percentages:
 chromium: 15.0-20.0%, 
 carbon: 1.0-2.0%, 
 manganese: 1.5-2.0%, 
 silicon: 0.8-1.2%, 
 nickel: 8.0-10.0%, 
 molybdenum: 0.8-1.2% 
 
       balance iron and unavoidable metallic and non-metallic contaminants where the non-metallic contaminants comprise nitrogen, women, phosphorous and sulphur. 
     
     
         8 . The method according to  claim 7 , wherein the alloy comprises 16.5-19.5 weight percentage chromium. 
     
     
         9 . The method according to  claim 7 , wherein the alloy comprises 17.0-19.0 weight percentage chromium. 
     
     
         10 . The method according to  claim 7 , wherein the alloy comprises 1.25-1.85 weight percentage carbon. 
     
     
         11 . The method according to  claim 7 , wherein the alloy comprises 1.5-1.7 weight percentage carbon. 
     
     
         12 . The method according to  claim 7 , wherein the alloy is in the form of an austenitic matrix.