Pearlitic steel rail having excellent wear resistance and method of producing the same
US5762723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Jul 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention is directed to improve a wear resistance and a damage resistance required for a rail of a sharply curved zone of a heavy load railway, comprising more than 0.85 to 1.20% of C, 0.10 to 1.00% of Si, 0.40 to 1.50% of Mn and if necessary, at least one member selected from the group consisting of Cr, Mo, V, Nb, Co and B, and retaining high temperature of hot rolling or a steel rail heated to a high temperature for the purpose of heat-treatment, the present invention provides a pearlitic steel rail having a good wear resistance and a good damage resistance, and a method of producing the same, wherein a head portion of the steel rail is acceleratedly cooled at a rate of 1.degree. to 10.degree. C./sec from an austenite zone temperature to a cooling stop temperature of 700.degree. to 500.degree. C. so that the hardness of the head portion is at least Hv 320 within the range of a 20 mm depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.