Ferritic-austenitic two-phase stainless steel material and method for manufacturing same
US10793930B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2017 |
| Grant date | Oct 6, 2020 |
| Priority date | — |
| Expiry date | Apr 1, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel material contains, in mass %, C: 0.005 to 0.050, N: 0.05 to 0.30, Si: 0.1 to 1.5, Mn: 0.1 to 7.0, P: 0.005 to 0.100, S: 0.0001 to 0.0200, Cr: 18.0 to 28.0, Cu: 0.1 to 3.0, Ni: 0.1 to 8.0, Mo: 0.1 to 5.0, Al: 0.001 to 0.050, B: 0.0001 to 0.0200, and Ca: 0.0001 to 0.0100. An area ratio of an austenitic phase ranges from 30% to 70% and formulae (I) and (II) below are satisfied. 1.03≤[% Cr*F]/[% Cr]≤1.40 Formula (I)1.05≤[% Mn*A]/[% Mn]≤1.80 Formula (II) [% symbol of an element]: a content of the element in the steel [% symbol of an element*F]: a content of the element in a ferrite phase [% symbol of element*A]: a content of the element in the austenitic phase
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.