Title:
SEAMLESS-METAL-PIPE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2013/065554
Kind Code:
A1
Abstract:
Provided is a seamless-metal-pipe manufacturing method whereby cracking of the pipe when in a molten state is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in which a high alloy containing 20-30% chromium and more than 22% but no more than 60% nickel, by mass, is heated in a first furnace; a step (S3) in which hollow tube stock is produced by using a first piercer to pierce/roll the high alloy that has been heated in the first furnace; a step (S4) in which the hollow tube stock is heated in a second furnace; and a step (S5) in which either the first piercer or a different second piercer is used to draw/roll the hollow tube stock that has been heated in the second furnace.
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Inventors:
YAMANE KOUJI (JP)
YAMAKAWA TOMIO (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)
SHIMODA KAZUHIRO (JP)
Application Number:
PCT/JP2012/077495
Publication Date:
May 10, 2013
Filing Date:
October 24, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21B19/06; B21B19/04
Foreign References:
| JP2008161906A | 2008-07-17 | |||
| JPH10128412A | 1998-05-19 | |||
| JPH04187310A | 1992-07-06 | |||
| JP2002239612A | 2002-08-27 | |||
| JPH05277516A | 1993-10-26 | |||
| JPH04187310A | 1992-07-06 | |||
| JPS6427707A | 1989-01-30 |
Other References:
See also references of EP 2752253A4
Attorney, Agent or Firm:
UEBA Hidetoshi et al. (JP)
Hidetoshi Ueha (JP)
Hidetoshi Ueha (JP)
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Claims: