Title:
継目無管の製造方法
Document Type and Number:
Japanese Patent JP4389869
Kind Code:
B2
Abstract:
When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying the portions of wall thickness variation where the thickness varies in the circumferential direction of the seamless pipe, and carrying out elongation rolling so that the thickness of the portions of the mother tube corresponding to the portions of wall thickness variation of the seamless pipe are different in thickness at the completion of elongation rolling from that of other portions of the mother tube. As a result, local variations in wall thickness in the circumferential direction of a seamless pipe are prevented.
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Inventors:
Hiroyuki Iwamoto
Akihito Yamane
Toru Ekoshi
Kenichi Shinoki
Akihito Yamane
Toru Ekoshi
Kenichi Shinoki
Application Number:
JP2005504102A
Publication Date:
December 24, 2009
Filing Date:
March 25, 2004
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B17/02; B21B17/04; B21B23/00; B21B37/78; B21B15/00
Domestic Patent References:
| JP1284411A | ||||
| JP52092857A | ||||
| JP2002035818A | ||||
| JP2002224737A |
Attorney, Agent or Firm:
Shoichi Hirose