Pre-hardened steel composition and machine parts made therewith

Abstract

A mud pump with components manufactured from high strength and toughness steel is disclosed. The mud pump includes a power end and a fluid end. The power end includes a motor, crankshaft rotationally engaged with the motor and a connecting rod rotationally engaged with the crank shaft. The fluid end includes a piston, a cylinder, a drilling fluid module, a discharge manifold, and a strainer cross. At least one of the plunger, the drilling fluid module, the discharge manifold, and the strainer cross has the following composition in weight percent: 0.25-0.55% carbon, 0.70-1.50% manganese, a maximum of 0.025% phosphorous, a maximum of 0.050% sulfur, a maximum of 0.80% silicon, 0.10-0.80% nickel, 1.40-2.20% chromium, 0.10-0.55% molybdenum, a maximum of 0.030% vanadium, a maximum of 0.35% copper, a maximum of 0.040% aluminum, a balance of iron, and incidental impurities.

1 .- 15 . (canceled) 
     
     
         16 . A steel comprising the following composition in percent by weight: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   C 
                   0.20-0.55%, 
                 
                     
                   Mn 
                   0.70-1.50%, 
                 
                     
                   P 
                   0.025% max., 
                 
                     
                   S 
                   0.050% max., 
                 
                     
                   Si 
                    0.80% max., 
                 
                     
                   Ni 
                   0.10-0.80%, 
                 
                     
                   Cr 
                   1.40-2.20%, 
                 
                     
                   Mo 
                   0.10-0.55%, 
                 
                     
                   V 
                   0.030% max., 
                 
                     
                   Cu 
                    0.35% max., 
                 
                     
                   Al 
                   0.040% max., 
                 
                     
                   Fe 
                   balance, and 
                 
                     
                     
                   incidental impurities. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         17 . The steel of  claim 16 , wherein the steel composition comprises the following composition in percent by weight: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   C 
                   0.20-0.35%, 
                 
                     
                   Mn 
                   1.20-1.45%, 
                 
                     
                   P 
                   0.025% max., 
                 
                     
                   S 
                   0.025% max., 
                 
                     
                   Si 
                   0.15-0.40%, 
                 
                     
                   Ni 
                   0.35-0.70%, 
                 
                     
                   Cr 
                   1.70-2.05%, 
                 
                     
                   Mo 
                   0.35-0.55%, 
                 
                     
                   V 
                   0.030% max., 
                 
                     
                   Cu 
                    0.35% max., 
                 
                     
                   Al 
                   0.040% max., 
                 
                     
                   Fe 
                   balance, and 
                 
                     
                     
                   incidental impurities. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         18 . The steel of  claim 16 , wherein the steel composition comprises the following composition in percent by weight: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   C 
                   0.30-0.35%, 
                 
                     
                   Mn 
                   1.20-1.35%, 
                 
                     
                   P 
                   0.010% max., 
                 
                     
                   S 
                   0.010% max., 
                 
                     
                   Si 
                   0.20-0.35%, 
                 
                     
                   Ni 
                   0.55-0.65%, 
                 
                     
                   Cr 
                   1.75-2.00%, 
                 
                     
                   Mo 
                   0.40-0.50%, 
                 
                     
                   V 
                   0.010% max., 
                 
                     
                   Cu 
                    0.20% max., 
                 
                     
                   Al 
                   0.025% max., 
                 
                     
                   Fe 
                   balance, and 
                 
                     
                     
                   incidental impurities. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         19 . The steel of  claim 16 , wherein a block of the steel composition is prepared in an electric arc furnace by:
 a. melting the bulk of the steel composition containing the majority of the alloy ingredients to produce a steel melt suitable for tapping into a receptacle,   b. thereafter tapping, heating, alloying, and refining the heat to bring the heat to its final composition,   c. vacuum degassing, teeming and casting the heat by bottom pouring practices to form an ingot,   d. hot working the ingot to form a block, and   e. thereafter heat treating the block by water quenching and tempering to form a final hot work product.   
     
     
         20 . The steel of  claim 19 , wherein the final hot work product is subsequently subjected to:
 austenitizing at a temperature of between 800° and 950° C.,   quenching in water, and   tempering at a temperature of between 500° and 700° C. to form a microstructure consisting mostly of martensite and bainite or a mixture of martensite, bainite and perlite which will be deeper than ¼ of the thickness of the block.   
     
     
         21 . The steel of  claim 17 , wherein a block of the steel composition is prepared in an electric arc furnace by:
 a. melting the bulk of the steel composition containing the majority of the alloy ingredients to produce a steel melt suitable for tapping into a receptacle,   b. thereafter tapping, heating, alloying, and refining the heat to bring the heat to its final composition,   c. vacuum degassing, teeming and casting the heat by bottom pouring practices to form an ingot,   d. hot working the ingot to form a block, and   e. thereafter heat treating the block by water quenching and tempering to form a final hot work product.   
     
     
         22 . The steel of  claim 21 , wherein the final hot work product is subsequently subjected to:
 austenitizing at a temperature of between 800° and 950° C.,   quenching in water, and   tempering at a temperature of between 500° and 700° C. to form a microstructure consisting mostly of martensite and bainite or a mixture of martensite, bainite and perlite which will be deeper than ¼ of the thickness of the block.   
     
     
         23 . The steel of  claim 18 , wherein a block of the steel composition is prepared in an electric arc furnace by:
 a. melting the bulk of the steel composition containing the majority of the alloy ingredients to produce a steel melt suitable for tapping into a receptacle,   b. thereafter tapping, heating, alloying, and refining the heat to bring the heat to its final composition,   c. vacuum degassing, teeming and casting the heat by bottom pouring practices to form an ingot,   d. hot working the ingot to form a block, and   e. thereafter heat treating the block by water quenching and tempering to form a final hot work product.   
     
     
         24 . The steel of  claim 23 , wherein the final hot work product is subsequently subjected to:
 austenitizing at a temperature of between 800° and 950° C.,   quenching in water, and   tempering at a temperature of between 500° and 700° C. to form a microstructure consisting mostly of martensite and bainite or a mixture of martensite, bainite and perlite which will be deeper than ¼ of the thickness of the block.   
     
     
         25 . The block of steel of  claim 20 , the steel is further worked to form a component of a mud pump. 
     
     
         26 . The block of steel of  claim 20 , the steel is further worked to form a component of a machine part. 
     
     
         27 . The block of steel of  claim 20 , the steel is further worked into a discharge manifold. 
     
     
         28 . The block of steel of  claim 20 , the steel is further worked into a a strainer cross. 
     
     
         29 . The block of steel of  claim 20 , the steel is further worked into a component of an oil field exploration machinery. 
     
     
         30 . The block of steel of  claim 20 , the steel is further worked into an adapter spool. 
     
     
         31 . The block of steel of  claim 20 , the steel is further worked into a piston or a cylinder 
     
     
         32 . The block of steel of  claim 20 , the steel is further worked into a crankshaft. 
     
     
         33 . The block of steel of  claim 20 , the steel is further worked into a drilling fluid module. 
     
     
         34 . The block of steel of  claim 20 , the steel is further worked into a plunger. 
     
     
         35 . The block of steel of  claim 22 , the steel is further worked to form a component of a mud pump.