Transformation controlled nitride precipitation hardening heat treatable steel
US6592685B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Jul 15, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a transformation controlled nitride precipitation hardening heat-treatable steel with the following composition (data in wt. %): 15-18 Cr, max. 0.5 Mn, 4-10 Ni, max. 15 Co, max. 4 W, max. 4 Mo, 0.5-1 V, at least one of Nb, Ta, Hf and Zr totaling between 0.001-0.1, 0.001-0.05 Ti, max. 0.5 Si, max. 0.05 C, 0.13-0.25 N, max. 4 Cu, rest iron and usual impurities, under the condition that the weight ratio of vanadium to nitrogen V/N is in the range between 3.5 and 4.2. The invention also relates to a heat treatment process for this steel. Very good strength, ductility and also corrosion resistance can be attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.