Laser-welded steel pipe and method therefor

Details Laser-welded steel pipe and method therefor Laser-welded steel pipe and method therefor

B - Operations, Transporting

23

K

B23K 26/00 (2006.01) B21C 37/08 (2006.01) B23K 26/26 (2006.01) B23K 26/32 (2006.01) F16L 9/02 (2006.01)

Patent

CA 2182751

A laser-welded steel pipe comprises: 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: [Cwt.%] x [Owt.%] ? 0.006, for the steel pipe containing C in an amount of less than 0.2 wt.%, [O wt.%] ? 0.03, for the steel pipe containing C in an amount of 0.2 wt.% or more. A manufacturing method includes: pressing a open pipe by squeeze rolls to butt the two edge parts each other; and welding the butted two edge parts by irradiating a laser beam to heat and melt the two edge parts.

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