Method for heat-treating profiled rolling stock
US6770155B2 · kind B2 · utility
0Cited by
9References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Jun 18, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2221/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the manufacture of a railroad rail of a steel alloy having a pearlitic microstructure. The rail is is shaped at a reduction rate of 1.8 to 8% and aligned straight in its longitudinal direction at a temperature between 770° C. and 1050° C., whereafter it is mounted with the head down and is allowed to cool slowly in still air to a temperature of 5 to 120° C. above the Ar3 temperature, and upon reaching this temperature at least the rail head is dipped into a cooling liquid and is cooled to the temperature of conversion of an austenitic grain microstructure into a fine pearlitic grain microstructure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.