Martensitic stainless steel having excellent hardness by subzero treatment
US4846904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | May 19, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention provides the following stainless steels called invention steel 1 and invention steel 2. Invention steel 1 is a subzero treatment hardening type martensitic stainless steel characterized by comprising not more than 0.4% by weight of C, not more than 0.4% by weight of N, not more than 15% by weight of Mn, not more than 12% by weight of Ni, 10 to 23% by weight of Cr, not more than 3.0% by weight of Mo, not more than 5.0% by weight of Cur, not more than 2.0% by weight of Si, and the remaining portion consisting of inevitable impurities and Fe and satisfying the following formaulae (1), (2) and (3), EQU [Cr %]+1.5[Si %]+[Mo %]-[Mn %)]-1.3[Ni %]-[Cu %]-19 [C %]-19[N %].ltoreq.12.0 Formula (1) EQU 27.5.ltoreq.[Cr %]+1.3[SDi %]+1.3[Mn %]+1.5[Ni %]+[Cu %]+[Mo %]+15[C %]+20[N %].ltoreq.32.0 Formula (2) and EQU 1.3[Ni %]+[Mn %]+[Cu %]>4.0 Formula (3) Invention steel is a subzero treatment hardening type martensitic stainless characterized by comprising not more than 0.4% by weight of C, not more than 0.4% by weight of Mn, not more than 3.0% by weight of Ni, 10 to 23% by weight of Cr, not more than 3.0% by weight of Mo, not more than 2.0% by weight of Cu, not more than 2.0% by w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.