Duplex stainless steel, seamless steel pipe or tube, and a method of manufacturing the duplex stainless steel
US12344910B2 · kind B2 · utility
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Key dates
| Filing date | Nov 14, 2019 |
| Grant date | Jul 1, 2025 |
| Priority date | — |
| Expiry date | Apr 13, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is duplex stainless steel which has high strength and high toughness and can be subjected to hot working during manufacturing processes, the duplex stainless steel having a predetermined chemical composition and a microstructure containing an austenite phase in a volume fraction of 20% to 70% and a ferrite phase in a volume fraction of 30% to 80%, and mechanical properties such that a yield strength is 862 MPa or more and an absorption energy in a Charpy impact test at −10° C., vE−10, is 40 J or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.