Title:
ELECTRIC-RESISTANCE-WELDED CLAD STEEL PIPE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/047722
Kind Code:
A1
Abstract:
Provided is an electric-resistance-welded clad steel pipe whereby a region in which a solidification structure having a particularly large effect on characteristics is formed in a weld is reduced, and function as a clad pipe is also not compromised. An electric-resistance-welded clad steel pipe having a first layer comprising carbon steel or low-alloy steel as a base metal and a cladding metal second layer comprising stainless steel or a nickel-containing alloy, the second layer being layered on one surface of the first layer, wherein the base metal is not exposed on a cladding-metal-side surface of the electric-resistance-welded clad steel pipe in a weld, and a solidification structure is not contained in each of circular cross-sections having a radius of 0.1 mm in a plane perpendicular to the pipe longitudinal direction, the circular cross-sections being centered at positions (i) through (iii). (i): A position in the weld at a depth of 1 mm from the outer surface of the electric-resistance-welded clad steel pipe and 0.3 mm in the width direction of a weld metal from the center of the width of the weld metal in a circumferential direction of the pipe. (ii): A position in the weld at the center in a thickness direction of the electric-resistance-welded clad steel pipe and 0.3 mm in the width direction of the weld metal from the center of the width of the weld metal in the circumferential direction of the pipe. (iii): A position in the weld at a depth of 1 mm from the inner surface of the electric-resistance-welded clad steel pipe and 0.3 mm in the width direction of the weld metal from the center of the width of the weld metal in the circumferential direction of the pipe.
Inventors:
IDE SHINSUKE (JP)
MATSUMOTO AKIHIDE (JP)
MATSUMOTO ATSUSHI (JP)
OKABE TAKATOSHI (JP)
MATSUMOTO AKIHIDE (JP)
MATSUMOTO ATSUSHI (JP)
OKABE TAKATOSHI (JP)
Application Number:
PCT/JP2017/031489
Publication Date:
March 15, 2018
Filing Date:
August 31, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21C37/08; B23K13/00; B23K13/06; C21D9/08; C21D9/50; C22C38/00; C22C38/60; C22F1/00
Domestic Patent References:
| WO2016143271A1 | 2016-09-15 |
Foreign References:
| JPS61172684A | 1986-08-04 | |||
| JPS6380993A | 1988-04-11 |
Other References:
See also references of EP 3511081A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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