Electric resistance welded steel tube for coiled tubing and method for manufacturing the same
US11421298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2017 |
| Grant date | Aug 23, 2022 |
| Priority date | — |
| Expiry date | Aug 20, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is provided an electric resistance welded steel tube having a yield strength of 896 MPa or more, and excellent low-cycle fatigue resistance, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after performing electric resistance welding and a method for manufacturing the same. The steel tube includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N at a specific content. The steel tube has a microstructure that contains 2% to 10% retained austenite and 20% or less martensite on a volume fraction basis, and the remainder being bainite. The yield strength is set to 896 MPa or more and the uniform elongation is set to 9.0% or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.