Method of manufacturing stainless pipe for oil wells and stainless steel pipe for oil wells
US11066718B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Oct 19, 2016 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Sep 16, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of manufacturing a stainless steel pipe includes preparing a hollow shell having a composition (mass %): up to 0.05% C; up to 1.0% Si; 0.01 to 1.0% Mn; up to 0.05% P; below 0.002% S; 0.001 to 0.1% Al; 16.0 to 18.0% Cr; 3.0 to 5.5% Ni; 1.8 to 3.0% Mo; 1.0 to 3.5% Cu; up to 0.05% N; up to 0.05% O; 0 to 0.3% Ti; 0 to 0.3% Nb; 0 to 0.3% V; 0 to 2.0% W; 0 to 0.01% Ca; 0 to 0.01% B; the balance Fe and impurities, holding the shell in a temperature range of 420 to 460° C. for 60 to 180 minutes; and then holding the shell in a temperature range of 550 to 600° C. for 5 to 300 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.