High strength stainless steel seamless pipe with excellent corrosion resistance for oil well and method of manufacturing the same
US9758850B2 · kind B2 · utility
2Cited by
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Key dates
| Filing date | Jun 19, 2013 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Feb 27, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A pipe having chemical composition contains, by mass %, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% or more and 1.0% or less, Cr: 13.5% or more and 15.4% or less, Ni: 3.5% or more and 6.0% or less, Mo: 1.5% or more and 5.0% or less, Cu: 3.5% or less, W: 2.5% or less, and N: 0.15% or less so that the relationship −5.9×(7.82+27C−0.91 Si+0.21Mn−0.9Cr+Ni−1.1Mo−0.55W+0.2Cu+11N)≧13.0 is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.