Martensitic stainless steel machineability optimization
US9464336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2011 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Jul 22, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of fabricating a martensitic stainless steel including: 1) heating steel to a temperature higher than austenizing temperature of the steel, then quenching the steel until a hottest portion of the steel is at a temperature less than or equal to a maximum temperature, and greater than or equal to a minimum temperature, a cooling rate being sufficiently fast for austenite not to transform into a ferrito-perlitic structure; 2) performing a first anneal followed by cooling until the hottest portion of the steel is at a temperature less than or equal to the maximum temperature and greater than or equal to the minimum temperature; 3) performing a second anneal followed by cooling to ambient temperature; and at the end of each of 1) and 2), performing: ω) as soon as temperature of the hottest portion of the steel reaches the maximum temperature, immediately heating the steel once more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.