Method and facility for carbonitriding one or more steel parts under low pressure and at a high temperature
US11512381B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2015 |
| Grant date | Nov 29, 2022 |
| Priority date | — |
| Expiry date | Feb 25, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a carbonitriding facility (IC) which includes: a heating chamber (CC), for heating at least one steel part (PA) to a first temperature, in the presence of a neutral gas and under a selected pressure; a first enriching chamber (CE1) for enriching the heated part with nitrogen, by nitriding same in α-phase at a second temperature no higher than the first temperature; a second enriching chamber (CE2) for enriching the nitrogen-enriched part with carbon, by carburising same at a third temperature higher than the second temperature; a quench chamber (CT) for quenching the nitrogen- and carbon-enriched part under pressure; a transfer airlock (ST) communicating with the chambers and suitable for temporarily receiving the part in a controlled atmosphere; and transfer means (MT) for transfer-ring the part from one chamber to another chamber via the transfer airlock (ST).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.