Method for producing rail
US12221660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2020 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Apr 17, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a method for producing a rail, with which the sweep in the height direction of a rail before straightening can be suppressed when producing standard rails specified in JIS E 1101. The method includes subjecting a bloom having a chemical composition containing, in mass %, C: 0.60% or more and 0.85% or less, Si: 0.10% or more and 1.00% or less, and Mn: 0.10% or more and 1.30% or less, with the balance being Fe and inevitable impurities, to hot rolling to obtain a rail, subjecting the rail to accelerated cooling under conditions where a cooling start temperature T1 of rail head is 750° C. or higher and 850° C. or lower, a cooling stop temperature T2 of rail head is higher than 700° C., and T1−T2 is 20° C. or more, and then allowing the rail to be naturally cooled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.