Chromium steel alloys and articles made thereof

Abstract

A chromium steel alloy comprising 0.25 to 0.35% of carbon, 0.3 to 0.5% of silicon, 0.8 to 1.5% of manganese, 1.0 to 2.0% of molybdenum, 1.5 to 3.5% of chromium, 0.5 to 1.5% of nickel, 0.5 to 2.5% of tungsten, 0.15 to 0.30% of vanadium and/or 0.05 to 0.10% of niobium, 0.05 to 1.0% of copper, 0.01 to 0.2% of aluminum and 0.01 to 1.0% of cobalt, remainder iron is distinguished by a high resistance to hydrogen embrittlement and is therefore particularly suitable for use as a material for objects coated electrolytically, by PVD or by CVD, for example for saw blades with hard-material particles intercalated into the coating.

1 . An article which is resistant to hydrogen embrittlement having by weight: 
 0.25 to 0.35% of carbon    0.3 to 0.5% of silicon    0.8 to 1.5% of manganese    1.0 to 2.0% of molybdenum    1.5 to 3.5% of chromium    0.5 to 1.5% of nickel    0.5 to 2.5% of tungsten    0.15 to 0.30% of vanadium    and/or    0.05 to 0.10% of niobium    0.05 to 1.0% of copper    0.01 to 0.2% of aluminum    0.01 to 1.0% of cobalt    remainder iron including smelting-related impurities.    
     
     
         2 . The article of  claim 1  which contains—individually or in combination—1.2 to 1.8% of molybdenum, 1.5 to 2.5% of chromium and 1.2 to 1.8% of tungsten.  
     
     
         3 . The article of  claim 1  wherein the ratio of the molybdenum and tungsten contents is 0.9 to 1.1.  
     
     
         4 . The article of  claim 2  wherein the ratio of the molybdenum and tungsten contents is 0.9 to 1.1.  
     
     
         5 . The article of  claim 1  treated by an austenitization treatment at 1150 to 1200° C., and followed by quenching to room temperature and tempering at 450 to 600° C.  
     
     
         6 . The article of  claim 2  treated by an austenitization treatment at 1150 to 1200° C., and followed by quenching to room temperature and tempering at 450 to 600° C.  
     
     
         7 . The article of  claim 3  treated by an austenitization treatment at 1150 to 1200° C., and followed by quenching to room temperature and tempering at 450 to 600° C.  
     
     
         8 . The article of  claim 1  which has been coated electrolytically, by PVD or by CVD.  
     
     
         9 . The article of  claim 2  which has been coated electrolytically, by PVD or by CVD.  
     
     
         10 . The article of  claim 3  which has been coated electrolytically, by PVD or by CVD.  
     
     
         11 . The article of  claim 5  which has been coated electrolytically, by PVD or by CVD.  
     
     
         12 . The article of  claim 1  coated electrolytically by PVD or by CVD with intercalated hard-material particles.  
     
     
         13 . The article of  claim 2  coated electrolytically by PVD or by CVD with intercalated hard-material particles.  
     
     
         14 . The article of  claim 3  coated electrolytically by PVD or by CVD with intercalated hard-material particles.  
     
     
         15 . The article of  claim 5  coated electrolytically by PVD or by CVD with intercalated hard-material particles.  
     
     
         16 . A sawblade made of a steel alloy of  claim 1 , coated at least in the region of the cutting teeth with an electrolytic, PVD or CVD layer containing hard-material particle.  
     
     
         17 . A sawblade made of a steel alloy of  claim 2 , coated at least in the region of the cutting teeth with an electrolytic, PVD or CVD layer containing hard-material particle.  
     
     
         18 . A sawblade made of a steel alloy of  claim 3 , coated at least in the region of the cutting teeth with an electrolytic, PVD or CVD layer containing hard-material particle.  
     
     
         19 . A sawblade made of a steel alloy of  claim 5 , coated at least in the region of the cutting teeth with an electrolytic, PVD or CVD layer containing hard-material particle.