Welding of an element of a track unit and a rail section without adding any material

Abstract

The stretch of rail comprises a railway switch element ( 12 ) made from high-alloy steel, in which at least one alloy element has a content equal to at least 5% by weight, and a length of rail ( 14 ) made from steel, connected to one another by a weld without deposition of metal. The length of rail ( 14 ) is formed from a medium-alloy low-carbon steel of which the carbon content is less than 0.55% by weight.

1 . Stretch of rail comprising a railway switch element ( 12 ) made from high-alloy steel, in which at least one alloy element has a content equal to at least 5% by weight, and a length of rail ( 14 ) made from medium-alloy steel, directly connected to one another by a weld without deposition of metal, characterised in that the length of rail ( 14 ) is formed from a medium-alloy low-carbon steel in which the carbon content is less than 0.55% by weight.  
     
     
         2 . Stretch of rail as claimed in  claim 1 , characterised in that the length of rail ( 14 ) is formed from a medium-alloy low-carbon steel in which the carbon content is less than 0.5% by weight.  
     
     
         3 . Stretch of rail as claimed in  claim 1 , characterised in that medium-alloy low-carbon steel forming the length of rail is a bainitic steel.  
     
     
         4 . Stretch of rail as claimed in  claim 3 , characterised in that the medium-alloy low-carbon steel is a bainitic steel without carbide.  
     
     
         5 . Stretch of rail as claimed in  claim 1 , characterised in that the medium-alloy low-carbon steel forming the length of rail has the following composition by weight: 
 0.05% to 0.50% of carbon;    0.5% to 2.5% of manganese;    0.6% to 3% of silicon or aluminium;    0.25% to 3.1% of chromium; and    0% to 0.9% of molybdenum.    
     
     
         6 . Stretch of rail as claimed in  claim 5 , characterised in that the medium-alloy low-carbon steel forming the length of rail has a composition defined below: 
 0.28% to 0.36% of carbon;    1.40% to 1.70% of manganese;    at most 0.03% of phosphorus;    0.01% to 0.03% of sulphur;    at most 0.005% of aluminium;    1% to 1.40% of silicon;    0.40% to 0.60% of chromium;    0.08% to 0.20% of molybdenum;    at most 0.04% of titanium; and    at most 0.004% of boron.    
     
     
         7 . Stretch of rail as claimed in  claim 1 , characterised in that the railway switch element made from high-alloy steel comprises 12% to 14% by weight of manganese.