Title:
MANUFACTURING METHOD OF ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN BUCKLING RESISTANCE
Document Type and Number:
Japanese Patent JP2009285710
Kind Code:
A
Abstract:
To solve a problem that a conventional technique has difficulty to obtain an electric resistance welded tube excellent both in out-of-roundness and buckling resistance.
In the manufacturing method of the electric resistance welded tube, roll-forming is applied while a band steel is passed through, with the abutted both ends in the width direction resistance-welded to form a tube and, after heat treatment on a resistance welded zone, the tube is straightened. In straightening the tube, rotary straightening machines are used, wherein the minimum diameter of the concave-surface rolls of the machine is set equal to or larger than the outer diameter of the tube.
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Inventors:
YOKOYAMA HIROYASU
KENMOCHI KAZUHITO
SAKATA TAKASHI
TSUBOUCHI SUSUMU
SUZUKI MASAHITO
KENMOCHI KAZUHITO
SAKATA TAKASHI
TSUBOUCHI SUSUMU
SUZUKI MASAHITO
Application Number:
JP2008142647A
Publication Date:
December 10, 2009
Filing Date:
May 30, 2008
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
B23K13/00; B21C37/08; B21D3/02; B23K13/01
Attorney, Agent or Firm:
Eiichi Kobayashi