Title:
METHOD OF MANUFACTURING SEAMLESS STEEL TUBE
Document Type and Number:
Japanese Patent JP2001259711
Kind Code:
A
Abstract:
To provide the inexpensive and simple manufacturing method of a seamless steel tube by which the damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like.
In a Mannesmann skew piercing process, a material to be pierced has a through hole in the center part of a cross section and, furthermore, a lubricant is blown into the inside of the through hole from the rear end of the material to be pierced on the inlet side of a skew piercing machine before piercing.
Inventors:
KATSUMURA TATSURO
AZUMA SHOZO
ARIIZUMI TAKASHI
ODA TATSUHARU
YAMAZAKI MOTOHARU
AZUMA SHOZO
ARIIZUMI TAKASHI
ODA TATSUHARU
YAMAZAKI MOTOHARU
Application Number:
JP2000079916A
Publication Date:
September 25, 2001
Filing Date:
March 22, 2000
Export Citation:
Assignee:
NIPPON KOKAN KK
International Classes:
B21B19/04; C22C38/44; (IPC1-7): B21B19/04
Attorney, Agent or Firm:
Shigeru Takano
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