Carbon and alloy steels thermochemical treatments
US6235128A · kind A · utility
6Cited by
9References
15Claims
0Family size
Inventors
Key dates
| Filing date | Mar 8, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Mar 8, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. This process comprises carburizing or carbonitriding the article, tempering the carburized or carbonitrided article, net-shaping (machining) the tempered article, and plasma (ion) nitriding the tempered article for a significantly reduced period of time versus conventional plasma (ion) nitriding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.