Gradient-structured ultra-fine bainitic low-alloy rail steel and preparation method thereof
US12084737B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2023 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Sep 20, 2043 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A gradient-structured ultra-fine bainitic low-alloy rail steel and a preparation method thereof are provided in the present application, belonging to the technical field of steel metallurgy. The rail steel to be treated is subjected to three thermal processing treatments so that the gradient-structured ultra-fine bainitic rail steel has a gradient structure consisting of a ferrite-pearlite dual phase microstructure and an ultra-fine bainite microstructure. The gradient structure of the present application enables the matrix of the rail to be a ferrite-pearlite composite phase structure, and only the surface layer of the service surface to be ultrafine bainite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.