Claims
- 1. 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.
- 2. The wheel of claim 1 wherein the steel's silicon content is from 1.51 to 3.0 weight percent.
- 3. The wheel of claim 1 wherein the steel's carbon content is from 0.60 to 1.0 weight percent.
- 4. The wheel of claim 1 wherein the steel's manganese content is from 0.45 to 0.85 weight percent.
- 5. The wheel of claim 1 wherein the steel's sulfur content is less than 0.05 weight percent.
- 6. The wheel of claim 1 wherein the steel's phosphorus content is less than 0.05 weight percent.
- 7. The wheel of claim 1 wherein the steel further comprises from 0.5 to 1.0 weight percent chromium.
- 8. 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.
- 9. The wheel of claim 8 wherein the steel's carbon content is from 0.67 to 0.77 weight percent.
- 10. The wheel of claim 8 wherein the steel's manganese content is from 0.60 to 0.85 weight percent.
- 11. The wheel of claim 8 wherein the steel's silicon content is from 1.51 to 2.0 weight percent.
- 12. 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.
- 13. The wheel of claim 12 wherein the steel's carbon content is from 0.67 to 0.77 weight percent.
- 14. The wheel of claim 12 wherein the steel's manganese content is from 0.60 to 0.75 weight percent.
- 15. The wheel of claim 12 wherein the steel's silicon content is from 1.51 to 2.0 weight percent.
RELATED APPLICATIONS
This patent application is a continuation patent application that claims priority to U.S. patent application Ser. No. 09/621,504, entitled “Railway Wheels Resistant to Martensite Transformation”, filed Jul. 21, 2000 and now U.S. Pat. No. 6,387,191 B1.
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A |
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A |
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Non-Patent Literature Citations (3)
Entry |
K.J. Sawley, Railway wheel slide damage, Engineering Against Fatigue, Mar. 1997, pp. 675-681, A. A. Balkoma, Rotterdam, Sheffield, UK. |
F. Demilly and B. Catot, Improved wheel life for heavy haul transport rolling stock, RAC, Jun. 9th-12th, 1996, pp. 5.34-5.43, Montreal. |
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Continuations (1)
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Number |
Date |
Country |
Parent |
09/621504 |
Jul 2000 |
US |
Child |
10/124552 |
|
US |