High-strength thick-walled electric resistance welded steel pipe having excellent low-temperature toughness and method of manufacturing the same
US9841124B2 · kind B2 · utility
2Cited by
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Key dates
| Filing date | Apr 11, 2013 |
| Grant date | Dec 12, 2017 |
| Priority date | — |
| Expiry date | Dec 22, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-strength thick-walled electric resistance welded steel pipe has excellent low-temperature toughness and excellent HIC resistance and a yield strength of 400 MPa or more.The steel has a chemical composition consisting of C: 0.025% to 0.084%, Si: 0.10% to 0.30%, Mn: 0.70% to 1.80%, controlled amounts of P, S, Al, N, and O, Nb: 0.001% to 0.065%, V: 0.001% to 0.065%, Ti: 0.001% to 0.033%, and Ca: 0.0001% to 0.0035% on a mass percent basis and the remainder being Fe and incidental impurities, and satisfies Pcm of 0.20 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.