Acid resistant austenitic alloy for valve seat insert

Abstract

A high carbon austenitic iron base alloy for wear and corrosion resistant applications is developed for valve seat insert applications when corrosion resistance is required. The alloy comprises 1.8-2.8 wt % carbon, 0.5-3.5 wt % silicon, 10.0-25.0 wt % chromium, less than 1.5 wt % manganese, 2.0-10.0 wt % molybdenum and tungsten combined, 1.0-4.0 wt % niobium and vanadium combined, 0-1.0 wt % titanium, 0.01-0.2 wt % aluminum, 12-25 wt % nickel, 0.5-3.0 wt % copper, and the balance being iron and a small amount of impurities.

1 . An austenitic iron base alloy with good corrosion and wear resistance, comprising: 
 a) about 1.8 to about 2.8 wt % carbon;    b) about 12.0 to about 25.0 wt % chromium;    c) about 0.5 to 3.5 wt % silicon;    d) about 12.0 to about 25.0 wt % nickel;    e) about 2.0 to about 10.0 wt % of tungsten and molybdenum combined;    f) about 1.0 to about 4 wt % niobium and vanadium combined;    g) about 0 to about 1.0 wt % titanium;    h) about 0.01 to about 0.2 wt % aluminum;    i) about 0.05 to about 3 wt % copper;    j) less than 1.5 wt % manganese;    g) The balance being iron and impurities.    
   
   
       2 . A part for internal combustion engine component comprising the alloy of  claim 1 .  
   
   
       3 . The part of  claim 2  where the part is formed by casting the alloy, hardfacing with the alloy either in wire or powder form,  
   
   
       4 . The part of  claim 2  where the part is formed by a powder metallurgy method.  
   
   
       5 . The alloy of  claim 1  wherein the amount of carbon is between about 2.3 and about 2.7 wt %.  
   
   
       6 . The alloy of  claim 1  wherein the amount of chromium is between about 16.0 and about 20.0 wt %.  
   
   
       7 . The alloy of  claim 1  wherein the amount of silicon is between about 0.5 and about 1.5 wt %.  
   
   
       8 . The alloy of  claim 1  wherein the amount of tungsten is between about 3.0 and about 7.0 wt %.  
   
   
       9 . The alloy of  claim 1  wherein the amount of nickel is between about 14.0 and about 18.0 wt %.  
   
   
       10 . The alloy of  claim 1  wherein the amount of niobium and vanadium combined is between about 1.5 and about 2.5 wt %.  
   
   
       11 . The alloy of  claim 1  wherein the amount of titanium is between about 0.02 and about 0.06 wt %.  
   
   
       12 . The alloy of  claim 1  wherein the amount of aluminum is between about 0.03 and about 0.06 wt %.  
   
   
       13 . The alloy of  claim 1  wherein the amount of copper is between about 1.0 and about 2.0 wt %.  
   
   
       14 . The alloy of  claim 1  wherein the amount of manganese is between about 0.2 and about 0.6 wt %.  
   
   
       15 . The alloy of  claim 1  wherein the amount of iron is greater than about 50 wt %.  
   
   
       16 . An austenitic iron base alloy with good corrosion and wear resistance, comprising: 
 a) about 1.8 to about 2.8 wt % carbon;    b) about 12.0 to about 25.0 wt % chromium;    c) about 0.5 to about 3.5 wt % silicon;    d) about 12.0 to about 25.0 wt % nickel;    e) about 10.0 to about 16.0 wt % of molybdenum and tungsten combined;    f) about 1.0 to about 4 wt % niobium and vanadium combined;    g) about 0.01 to about 1.0 wt % titanium;    h) about 0.01 to about 0.2 wt % aluminum;    i) about 0.05 to about 3.0 wt % copper;    j) less than 1.5 wt % manganese;    g) The balance being iron and impurities.    
   
   
       16 . A part for internal combustion engine component comprising the alloy of  claim 15 .  
   
   
       17 . The part of  claim 16  where the part is formed by casting the alloy, hardfacing with the alloy either in wire or powder form,  
   
   
       18 . The part of  claim 16  where the part is formed by a powder metallurgy method.  
   
   
       19 . The alloy of  claim 15  wherein the amount of carbon is between about 2.3 and about 2.7 wt %.  
   
   
       20 . The alloy of  claim 15  wherein the amount of chromium is between about 16.0 and about 20.0 wt %.  
   
   
       21 . The alloy of  claim 15  wherein the amount of silicon is between about 0.5 and about 1.5 wt %.  
   
   
       22 . The alloy of  claim 15  wherein the amount of molybdenum is between about 12.0 and about 15.0 wt %.  
   
   
       23 . The alloy of  claim 15  wherein the amount of nickel is between about 14.0 and about 18.0 wt %.  
   
   
       24 . The alloy of  claim 15  wherein the amount of niobium and vanadium combined is between about 1.5 and about 2.5 wt %.  
   
   
       25 . The alloy of  claim 15  wherein the amount of titanium is between about 0.02 and about 0.06 wt %.  
   
   
       26 . The alloy of  claim 15  wherein the amount of aluminum is between about 0.03 and about 0.06 wt %.  
   
   
       27 . The alloy of  claim 15  wherein the amount of copper is between about 1.0 and about 2.0 wt %.  
   
   
       28 . The alloy of  claim 15  wherein the amount of manganese is between about 0.2 and about 0.6 wt %.  
   
   
       29 . The alloy of  claim 15  wherein the amount of iron is greater than about 50 wt %.