Title:
METHOD OF MANUFACTURING ELECTROSEAMED STEEL
Document Type and Number:
Japanese Patent JP3518416
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method advantageous for small-lot multi-product production with reduction mill load to manufacture product pipes of good surface quality and superior material uniformity in the circumferential direction of the pipe.
SOLUTION: In this manufacturing method, a strip S is made into an open pipe P through continuous roll forming (roll former 5), then into a material pipe M through electroseam welding (open edge heater 6, squeeze roll 7), and then into a product pipe C through stretch reducing (reducer 8). In this case, the strip and/or open pipe is heated to the temperature area exceeding ordinary temperature but lower than point Ac3 (heating furnace 4 and/or open pipe heater), and stretch reducing is done in the temperature area of point Ac3 to 125°C.
Inventors:
Toyooka, Takaaki
Yorifuji, Akira
Kawabata, Yoshikazu
Nishimori, Masanori
Itaya, Motoaki
Okabe, Yoshitomo
Araya, Masatoshi
Nagahama, Takuya
Yorifuji, Akira
Kawabata, Yoshikazu
Nishimori, Masanori
Itaya, Motoaki
Okabe, Yoshitomo
Araya, Masatoshi
Nagahama, Takuya
Application Number:
JP11856999A
Publication Date:
April 12, 2004
Filing Date:
April 26, 1999
Export Citation:
Assignee:
KAWASAKI STEEL CORP
International Classes:
B21B17/14; B21C37/08; (IPC1-7): B21C37/08; B21B17/14
Attorney, Agent or Firm:
小林 英一
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