Duplex ferritic-martensitic stainless steel
US4054448A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1976 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Mar 29, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/38
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ferritic-martensitic duplex stainless steel having properties between those of ferritic and martensitic stainless steels. The steel consists essentially of, by weight, from 4.5 to 20.5% chromium, from 1.5 to 10.5% manganese, from 0.005 to 0.1% carbon, from 0.1 to 1.0% of an element from the group consisting of titanium and columbium, balance essentially iron. The steel is additionally characterized by chromium and manganese contents within Area ABCD of the Figure, and by a chromium equivalency of from 5.0 to 11.0, in accordance with the following equation: EQU Chromium = %Cr + 5(%Si) + 7(%Ti) + 4(% Cb) Equivalency + 4(% Mo) + 12(% Al) - 40(% C + % N) - 2(% Mn) - 3(% Ni) - % Cu
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.