US2011189047A1PendingUtilityA1

Railroad rail steels resistant to rolling contact fatigue

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Assignee: TRANSP TECHNOLOGY CT INCPriority: Feb 2, 2010Filed: Feb 2, 2010Published: Aug 4, 2011
Est. expiryFeb 2, 2030(~3.6 yrs left)· nominal 20-yr term from priority
Inventors:Daniel SzablewskiFrancisco C. Robles HernandezC. Isaac GarciaSemih KalayAnthony J. DeardoRaymundo Ordoniez
C22C 38/48C22C 38/42C22C 38/44C22C 38/46C21D 6/005C22C 38/04C22C 38/02C21D 9/04C21D 2211/009
36
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Claims

Abstract

Railroad rail steels having a pearlitic structure and containing 0.720 to 0.860 wt % carbon; 1.000 to 1.280 wt % manganese; 0.450 to 1.000 wt % silicon; 0.010 to 0.100 wt % copper; 0.150 to 0.280 wt % chromium; 0.0010 to 0.0500 wt % aluminum; 0.050 to 0.120 wt % nickel; 0.100 to 0.260 wt % molybdenum; 0.100 to 0.210 wt % vanadium; 0.0010 to 0.0065 wt % nitrogen; 0.0010 to 0.0080 wt % phosphorus; 0.0010 to 0.0040 wt % sulfur; and 0.0100 to 0.0350 wt % niobium with the remainder of said steel being iron, can be used to make railway rails that are particularly resistant to rolling contact fatigue and, hence, shelling.

Claims

exact text as granted — not AI-modified
1 . A railroad rail steel having a pearlitic structure is comprised of:
 0.720 to 0.860 wt % carbon;   1.000 to 1.280 wt % manganese;   0.450 to 1.000 wt % silicon;   0.010 to 0.100 wt % copper;   0.150 to 0.280 wt % chromium;   0.0010 to 0.0500 wt % aluminum;   0.050 to 0.120 wt % nickel;   0.100 to 0.260 wt % molybdenum;   0.100 to 0.210 wt % vanadium;   0.0010 to 0.0065 wt % nitrogen;   0.0010 to 0.0080 wt % phosphorus;   0.0010 to 0.0040 wt % sulfur; and   0.0100 to 0.0350 wt % niobium   
       with the balance being iron. 
     
     
         2 . The railroad rail steel of  claim 1  having an Austenite grain size of 15.0 to 40.0 microns. 
     
     
         3 . The railroad rail steel of  claim 1  having interlamellar spacings of 0.070 to 0.100 mm. 
     
     
         4 . The railroad rail steel of  claim 1  having non-metallic inclusions having a volume fraction of less than 0.001. 
     
     
         5 . The railroad rail steel of  claim 1  having virtually no pro-eutectoid cementite. 
     
     
         6 . The railroad rail steel of  claim 1  having a Brinell hardness of at least 400. 
     
     
         7 . The railroad rail steel of  claim 1  having a yield strength greater than 150. 
     
     
         8 . The railroad rail steel of  claim 1  having an ultimate tensile strength greater than 210 ksi. 
     
     
         9 . The railroad rail steel of  claim 1  having an elongation percentage greater than 12.0%. 
     
     
         10 . A railroad rail steel having a pearlitic structure is comprised of:
 0.720 to 0.860 wt % carbon;   1.000 to 1.280 wt % manganese;   0.450 to 1.000 wt % silicon;   0.010 to 0.100 wt % copper;   0.150 to 0.280 wt % chromium;   0.0010 to 0.0500 wt % aluminum;   0.050 to 0.120 wt % nickel;   0.100 to 0.260 wt % molybdenum;   0.100 to 0.210 wt % vanadium;   0.0010 to 0.0065 wt % nitrogen;   0.0010 to 0.0080 wt % phosphorus;   0.0010 to 0.0040 wt % sulfur; and   0.0100 to 0.0350 wt % niobium   
       with the balance being iron and wherein a molten form of said steel was subjected to a degassing operation. 
     
     
         11 . The railroad rail steel of  claim 10  having an Austenite grain size of 15.0 to 40.0 microns. 
     
     
         12 . The railroad rail steel of  claim 10  having interlamellar spacings of 0.070 to 0.100 mm. 
     
     
         13 . The railroad rail steel of  claim 10  having non-metallic inclusions having a volume fraction of less than 0.0001. 
     
     
         14 . The railroad rail steel of  claim 10  having virtually no pro-eutectoid cementite. 
     
     
         15 . The railroad rail steel of  claim 10  having a Brinell hardness greater than 400. 
     
     
         16 . The railroad rail steel of  claim 10  having a yield strength greater than 150. 
     
     
         17 . The railroad rail steel of  claim 10  having an ultimate tensile strength greater than 210 ksi. 
     
     
         18 . The railroad rail steel of  claim 10  having an elongation percentage greater than 12.0%. 
     
     
         19 . A railroad rail steel having a pearlitic structure is comprised of:
 0.720 to 0.860 wt % carbon;   1.000 to 1.280 wt % manganese;   0.450 to 1.000 wt % silicon;   0.010 to 0.100 wt % copper;   0.150 to 0.280 wt % chromium;   0.0010 to 0.0500 wt % aluminum;   0.050 to 0.120 wt % nickel;   0.100 to 0.260 wt % molybdenum;   0.100 to 0.210 wt % vanadium;   0.0010 to 0.0065 wt % nitrogen;   0.0010 to 0.0080 wt % phosphorus;   0.0010 to 0.0040 wt % sulfur; and   0.0100 to 0.0350 wt % niobium   
       with the balance being iron and wherein a bloom of said steel was subjected to thereto-mechanical processing. 
     
     
         20 . The railroad rail steel of  claim 19  having an Austenite grain size of 15.0 to 40.0 microns. 
     
     
         21 . The railroad rail steel of  claim 19  having interlamellar spacings of 0.070 to 0.100 mm. 
     
     
         22 . The railroad rail steel of  claim 19  having non-metallic inclusions having less than 0.001 volume fraction. 
     
     
         23 . The railroad rail steel of  claim 19  having virtually no pro-eutectoid cementite. 
     
     
         24 . The railroad rail steel of  claim 19  having a Brinell hardness of at least 400. 
     
     
         25 . The railroad rail steel of  claim 19  having a yield strength greater than 150. 
     
     
         26 . The railroad rail steel of  claim 19  having an ultimate tensile strength greater than 210 ksi. 
     
     
         27 . The railroad rail steel of  claim 19  having an elongation percentage greater than 12.0%. 
     
     
         28 . A railroad rail steel having a pearlitic structure is comprised of:
 0.720 to 0.860 wt % carbon;   1.000 to 1.280 wt % manganese;   0.450 to 1.000 wt % silicon;   0.010 to 0.100 wt % copper;   0.150 to 0.280 wt % chromium;   0.0010 to 0.0500 wt % aluminum;   0.050 to 0.120 wt % nickel;   0.100 to 0.260 wt % molybdenum;   0.100 to 0.210 wt % vanadium;   0.0010 to 0.0065 wt % nitrogen;   0.0010 to 0.0080 wt % phosphorus;   0.0010 to 0.0040 wt % sulfur; and   0.0100 to 0.0350 wt % niobium   
       with the balance being iron and whose rail head region was subjected to head hardening operations during its rail rolling operations. 
     
     
         29 . The railroad rail steel of  claim 28  having an Austenite grain size of 15.0 to 40.0 microns. 
     
     
         30 . The railroad rail steel of  claim 28  having interlamellar spacings of 0.070 to 0.100 mm. 
     
     
         31 . The railroad rail steel of  claim 28  having non-metallic inclusions having a volume fraction less than 0.001. 
     
     
         32 . The railroad rail steel of  claim 28  having virtually no pro-eutectoid cementite. 
     
     
         33 . The railroad rail steel of  claim 28  having a Brinell hardness of at least 400. 
     
     
         34 . The railroad rail steel of  claim 28  having a yield strength greater than 150. 
     
     
         35 . The railroad rail steel of  claim 28  having an ultimate tensile strength greater than 210 ksi. 
     
     
         36 . The railroad rail steel of  claim 28  having an elongation percentage greater than 12.0%.

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