Electric resistance welded steel pipe with excellent weld toughness for line pipe
US8328957B2 · kind B2 · utility
0Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 2007 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Dec 29, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In an electric resistance welded steel pipe with excellent weld toughness for a line pipe, the area fraction of minute defects each having a maximum length of less than 50 μm in a projection plane of an electric resistance welded seam is in the range of 0.000006 to 0.026, and the absorbed energy at −40° C. measured by a method for an impact test of metallic materials is 315 J or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.