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Title:
PLUG FOR PIERCING SEAMLESS STEEL TUBE AND METHOD FOR MANUFACTURING SEAMLESS STEEL TUBE
Document Type and Number:
Japanese Patent JP2002113507
Kind Code:
A
Abstract:

To provide a plug for piercing a seamless steel tube which has a long life even in rolling of high-allow steel such as stainless steel and a Ni-base alloy and with which a tube excellent in the properties of the inside surface because of small coefficient of friction.

This plug has a covering layer 2a consisting of a columbium base alloy whose Ti-content is 7-45 mass% and compressive deformation resistance at 1,573 K is ≥150 MPa on its outside surface. It is better that this covering layer 2a is formed by interposing an intermediate layer made of metal whose specific heat is larger than that of the covering layer.


Inventors:
TSUBOUCHI KENJI
IIDA SUMIO
IMAMURA MASAMI
Application Number:
JP2000306688A
Publication Date:
April 16, 2002
Filing Date:
October 05, 2000
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B25/00; B21B19/04; C22C38/00; (IPC1-7): B21B25/00; B21B19/04; C22C38/00
Attorney, Agent or Firm:
Morio Mori (1 outside)