Process for avoiding surface oxidation in the carburization of steels
US5498299A · kind A · utility
9Cited by
6References
11Claims
0Family size
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Inventor
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/76
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The surface oxidation under carburization temperatures of steels during the carburization with carbon-containing gas mixtures is avoided by heating the steels to the carburization temperature under a nitrogen/hydrogen mixture or pure hydrogen. For carburization, these gases are replaced by a carbon-containing gas mixture whose oxygen activity is smaller than that required for the formation of manganese(II) oxide or chromium(III) oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.