Title:
継目無鋼管の製造方法
Document Type and Number:
Japanese Patent JP4003463
Kind Code:
B2
Abstract:
A method of producing a seamless steel tube to enable it to suppress not only the deviations in wall thickness occurring in the direction of reduction in a mandrel mill but also the derivations in thickness occurring at places deviating from the direction of reduction: measuring the wall thicknesses within the circumferential directions of a seamless steel tube 14 rolled in a production line comprising a mandrel mill 11 consisting of a plurality of reduction stands 111 to 115 having reduction rolls disposed in succession with the directions of reduction varied each other, and controlling, separately and individually based on the results of the measurement, the positions of both ends of each axis of the reduction rolls 114 , 115 in the final reduction stands of the mandrel mill 11 so that the deviations in wall thickness can be minimized.
Inventors:
Kenichi Shinoki
Akihito Yamane
Akihito Yamane
Application Number:
JP2002018622A
Publication Date:
November 07, 2007
Filing Date:
January 28, 2002
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B17/02; B21B17/04; B21B37/18; B21B37/78; B21B17/14; B21B38/04
Domestic Patent References:
| JP871616A | ||||
| JP105817A | ||||
| JP617010A |
Attorney, Agent or Firm:
Mizogami Mitsuyoshi
Tetsuya Mizogami
Yoshinori Iwahara
Tetsuya Mizogami
Yoshinori Iwahara