Process for heat treatment under a gaseous atmosphere containing nitrogen and hydrocarbon
US4992113A · kind A · utility
16Cited by
8References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1990 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/76
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the heat treatment of low-alloy steels at temperatures higher than 600.degree. C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon C.sub.x H.sub.y and optionally hydrogen, with a control of the atmosphere. According to the invention, the composition of the residual species CH.sub.4, CO, H.sub.2 O, and the temperature of the gaseous mixture in the furnace are controlled in order to control the carburization and the decarburization of the treated steels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.