Process for refining high-chromium steels
US4474605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Feb 3, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C33/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for refining high-Cr steel, e.g. 13% Cr steel and 18% Cr steel, is disclosed. The process comprises preparing molten iron in a top-and-bottom blowing converter, heating the molten iron to a predetermined temperature, effecting the decarburization of the thus prepared molten iron by blowing oxygen gas through a top lance against the surface of the molten iron to provide a molten steel while, as bottom-blown gas, initially introducing an oxygen-containing gas into the molten steel then changing to an inert gas when the carbon content of said molten steel is reduced to a predetermined level so as to suppress the oxidation of chromium, and tapping the resulting molten steel out of the converter after adjusting the steel composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.