Method of producing carburizing forging steel material
US10519536B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2016 |
| Grant date | Dec 31, 2019 |
| Priority date | — |
| Expiry date | Nov 15, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing a carburizing forging material includes heating a steel material at 1300° C. or higher, forming Nb in a solid solution state and then rolling the steel material, heating the rolled steel material in a range of 950 to 1050° C., hot forging the heated steel material in a range of 950 to 1040° C., precipitating a Nb carbonitride in the steel material by cooling the steel material or maintaining a temperature of the steel material under a condition in which a time spent in a range of 950 to 970° C. is 1 minute or longer, precipitating a ferrite phase in the steel material by cooling the steel material or maintaining a temperature of the steel material under a condition in which a time spent in a range of 730 to 870° C. is 10 minutes or longer, and cooling the steel material to room temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.