METHOD OF MANUFACTURING SEAMLESS PIPE

Title:

METHOD OF MANUFACTURING SEAMLESS PIPE

Document Type and Number:

WIPO Patent Application WO/2007/116821

Kind Code:

A1

Abstract:

In this method of manufacturing a seamless pipe, a billet is disposed on a pass line between a pusher and a plug and is moved forward until it is caught between skewed rolls. Then, after the caught billet is in contact with the plug until at least piercing and rolling operation comes to a steady state, the billet is moved forward by the pusher so that the advance speed of the billet is higher than or equal to the advance speed in the steady state which speed is obtained when piercing and rolling operation is made without pushing the billet forward by the pusher. By this manufacturing method, the occurrence of defects on an end part inner surface of a hollow shell can be suppressed.

Inventors:

YAMAKAWA TOMIO (JP)
SHIMODA KAZUHIRO (JP)

Application Number:

PCT/JP2007/057085

Publication Date:

October 18, 2007

Filing Date:

March 30, 2007

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
YAMAKAWA TOMIO (JP)
SHIMODA KAZUHIRO (JP)

International Classes:

B21B19/04; B21B23/00; B21B39/00; B21C51/00

Foreign References:

JP2000246311A	2000-09-12
JP2001058207A	2001-03-06
JPS5950906A	1984-03-24
JP2000246311A	2000-09-12
JP2001162306A	2001-06-19
JP3503552B2	2004-03-08

Other References: