High strength seamless stainless steel pipe and method for producing same
US11268161B2 · kind B2 · utility
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Key dates
| Filing date | Dec 6, 2017 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Aug 15, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided herein is a high strength seamless stainless steel pipe. A method for producing such a high strength seamless stainless steel pipe is also provided. The high strength seamless stainless steel pipe has a certain composition. The high strength seamless stainless steel pipe has a structure that includes a tempered martensite phase as a primary phase, and 20 to 40% ferrite phase, and at most 25% residual austenite phase in terms of a volume fraction, and in which C, Cr, Ni, Mo, Nb, N, W, and Cu in the residual austenite phase satisfy a predetermined formula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.