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Title:
ELECTRIC RESISTANCE WELDED TUBE AND MANUFACTURING METHOD THEREOF
Document Type and Number:
Japanese Patent JP3473589
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a technology capable of manufacturing an electric resistance welded tube having excellent welding quality, grooving corrosion resistance and workability of a tube joint with high productivity by the hot or warm finish.
SOLUTION: The electric resistance welded tube 8 is manufactured by heating a steel strip 2 by a steel strip heating furnace 3, and performing the forming and electric resistance welding by a forming and induction heating welding equipment 4 to manufacture a steel tube. After the steel tube is re-heated continuously by a tube re-heating device 5, the steel tube is reduced by a reduction mill 6, and further cut to a predetermined tube length by a tube cutter 7 to manufacture the electric resistance welded tube 8. If the finish temperature of the reduction is set to be ≥Ar3 point, and, in particular, if C content is ≤0.2% or ≥0.001% to ≤0.2%, the finish temperature of the reduction is set to be ≥(Ar3 transformation point -50°C), and the aspect ratio of a main phase structure of the electric resistance welded tube 8 is set to be ≤5.0 by setting the starting temperature of the reduction to be higher than the finish temperature by 50°C.


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Inventors:
Tomoyuki Kubota
Ichiro Yasumura
Tsuneaki Nagamichi
Application Number:
JP2001114128A
Publication Date:
December 08, 2003
Filing Date:
April 12, 2001
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21C37/08; B23K13/00; C21D8/10; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): C22C38/00; C21D8/10; C22C38/06; C22C38/58
Domestic Patent References:
JP200269584A
JP200220841A
JP2301540A
JP3267316A
JP6015082A
Attorney, Agent or Firm:
Shoichi Hirose



 
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