Railway wheels resistant to martensite transformation
AssigneeTransportation Technology Center, Inc.
InventorsDaniel Hunter Stone, Kevin James Sawley
Life of this patent
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Abstract
Steels having a pearlitic structure and containing 0.60 to 1.0 weight percent carbon, 1.1 to 3.0 weight percent silicon, 0.45 to 0.85 weight percent manganese, less than 0.050 weight percent sulfur and less than 0.050 weight percent phosphorus, with the remainder of said steel being iron and incidental impurities, can be used to make railway wheels that are resistant to martensite transformations and, hence, spalling. The addition of 0.50 to 1.0 weight percent chromium to such steels further improves their resistance to spalling.
Claims15
A railway wheel made of a steel having a pearlite structure and containing silicon in a concentration sufficient to shift a nose region of the steel's pearlite starling curve Ps (in a continuous cooling transformation curve diagram wherein time is plotted on an X axis and temperature is plotted on a Y axis) far enough toward the Y axis (zero point in time) that said curve Ps will encounter a cooling curve that, after a skid, descends from a point in an austenite region that is above the Ps curve before the cooling curve descends to the steel's martensite starting temperature curve Ms.
A railway wheel made of a steel having a pearlitic structure and further comprising (by weight):
- 0.60 to 0.85 percent carbon, 1.51 to 3.0 percent silicon, 0.45 to 0.85 percent manganese, less than 0.050 percent sulfur and less than 0.050 percent phosphorus, with the remainder of said steel being iron and incidental impurities.
A railway wheel made of a steel having a pearlitic structure and further comprising (by weight):
- 0.60 to 0.85 percent carbon, 1.51 to 3.0 percent silicon, 0.45 to 0.85 percent manganese, 0.50 to 1.0 weight percent chromium, less than 0.050 weight percent sulfur and less than 0.50 weight percent phosphorus, with the remainder of said steel being iron and incidental impurities.
Dependencies are inferred from the claim text.