Title:
METHOD FOR PRODUCING STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2014/188944
Kind Code:
A1
Abstract:
This method for producing a steel pipe includes: a first tube expanding step for performing tube expansion on a steel pipe within a range of tube expansion rates such that the upper limit value is the greatest value of the tube expansion rate such that the equipment load of a tube expander is within an allowed range when performing tube expansion on the steel pipe, and the lower limit value is the tube expansion rate at which a predetermined circularity is obtained; and a second tube expansion step for performing tube expansion on the steel pipe after the first tube expansion step at a tube expansion rate at which the diameter of the steel pipe becomes a target value. As a result, it is possible to increase the circularity of the steel pipe without increasing the equipment load of the tube expander.
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Inventors:
MIWA TOSHIHIRO (JP)
HORIE MASAYUKI (JP)
HORIE MASAYUKI (JP)
Application Number:
PCT/JP2014/062925
Publication Date:
November 27, 2014
Filing Date:
May 15, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D3/14; B21C37/08; B21D39/20
Foreign References:
| JPH08300069A | 1996-11-19 | |||
| JPS59183943A | 1984-10-19 | |||
| JP2010167440A | 2010-08-05 | |||
| JPH0394936A | 1991-04-19 | |||
| JPS59183943A | 1984-10-19 | |||
| JPH091234A | 1997-01-07 | |||
| JPS61147930A | 1986-07-05 |
Other References:
See also references of EP 3000541A4
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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