High strength welded steel tube superior in hydrogen embrittlement cracking resistance of weld metal and method of production of same
US8653400B2 · kind B2 · utility
2Cited by
2References
6Claims
0Family size
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Key dates
| Filing date | Feb 22, 2006 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Aug 8, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/5185
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.