Laser-welded steel pipe
US5961748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/909
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A laser-welded steel pipe includes: a steel pipe consisting essentially of C in an amount of 0.01 to 0.5 wt. %, Si in an amount of 1 wt. % or less, Mn in an amount of 0.05 to 2 wt. % and Cr in an amount of 6 wt. % or less; and a weld zone having a melted and solidified metal structure containing carbon and oxygen. The carbon content, C wt. %!, and the oxygen content, O wt. %!, in the melted and solidified metal structure satisfies the following equations: PA0 C wt. %!.times.O wt. %!.ltoreq.0.006, for the steel pipe containing C in an amount of less than 0.2 wt. %, PA0 O wt. %!.ltoreq.0.03, for the steel pipe containing C in an amount of 0.2 wt. % or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.