Method for producing high speed steel

Abstract

A method for producing a high speed steel that with reference to its chemical composition consists of the following elements: 1-3 wt-% carbon (C), 3-6 wt-% chromium (Cr), 0-7 wt-% molybdenum (Mo), 0-15 wt-% tungsten (W), 3-14 wt-% vanadium (V), 0-10 wt-% cobalt (Co), 0-3 wt-% niobium (Nb), 0-0.5 wt-% nitrogen (N), 0.2-1 wt-% yttrium (Y), and remainder iron (Fe) and unavoidable impurities, and wherein Mo+0.5W=2-10 weight %, characterized in that the method comprises the steps of: providing a powder comprising the elements of the high speed steel, forming a body of the powder, and subjecting the body to elevated heat and pressure such that a consolidation of the powder thereof is achieved.

1 . A method for producing a high speed steel that with reference to its chemical composition consists of the following elements, in weight %: 
       
         
           
                 
                 
               
                     
                 
                   1-3 
                   Carbon (C) 
                 
                   3-6 
                   Chromium (Cr) 
                 
                   0-7 
                   Molybdenum (Mo) 
                 
                    0-15 
                   Tungsten (W) 
                 
                    3-14 
                   Vanadium (V) 
                 
                    0-10 
                   Cobalt (Co) 
                 
                   0-3 
                   Niobium (Nb) 
                 
                       0-0.5 
                   Nitrogen (N) 
                 
                   0.2-1     
                   Yttrium (Y), and 
                 
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         the remainder iron (Fe) and unavoidable impurities, wherein Mo+0.5W=2-10 weight %, the method comprising the steps of: 
         providing a powder comprising the elements of said high speed steel, 
         forming a body of said powder; and 
         subjecting said body to elevated heat and elevated pressure such that a consolidation of the powder thereof is achieved. 
       
     
     
         2 . A method for producing a high speed steel according to  claim 1 , wherein the step of providing the powder includes the step of argon-atomisation of molten metal comprising said elements into said powder. 
     
     
         3 . A method for producing a high speed steel according to  claim 1 , wherein the yttrium (Y) content of said high speed steel is more than 0.4 weight %. 
     
     
         4 . A method for producing a high speed steel according to  claim 1 , wherein the yttrium (Y) content of said high speed steel is 0.7 weight % or less. 
     
     
         5 . A method for producing a high speed steel according to  claim 1 , wherein the yttrium (Y) content of said high speed steel is within the range of from 0.45-0.60 weight %. 
     
     
         6 . A method for producing a high speed steel according to  claim 1 , wherein the carbon (C) content of said high speed steel is in the range of from 1.1-1.4 weight %. 
     
     
         7 . A method for producing a high speed steel according to  claim 1 , wherein the chromium (Cr) content of said high speed steel is in the range of from 3.0-6.0 weight %. 
     
     
         8 . A method for producing a high speed steel according to  claim 1 , wherein the chromium (Cr) content of said high speed steel is in the range of from 4.0-5.0 weight %. 
     
     
         9 . A method for producing a high speed steel according to  claim 1 , wherein the Molybdenum (Mo) content of said high speed steel is in the range of from 4.5-5.5 weight %. 
     
     
         10 . A method for producing a high speed steel according to  claim 1 , wherein the tungsten (W) content of said high speed steel is in the range of from 6-7 weight %. 
     
     
         11 . A method for producing a high speed steel according to  claim 1 , wherein Mo+0.5W=5.0-8.5 weight %. 
     
     
         12 . A method for producing a high speed steel according to  claim 1 , wherein the Vanadium (V) content of said high speed steel is in the range of from 3.0-5.0 weight %. 
     
     
         13 . A method for producing a high speed steel according to  claim 1 , wherein the Cobalt (Co) content of said high speed steel is in the range of from 8.0-9.0 weight %. 
     
     
         14 . A method for producing a high speed steel according to  claim 1 , wherein the high speed steel has a mean carbide particle size <3 μm. 
     
     
         15 . A method for producing a high speed steel according to  claim 1 , wherein the high speed steel has an isotropic microstructure.