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Patent Searching and Data


Title:
METHOD FOR ROLLING SEAMLESS TUBE
Document Type and Number:
Japanese Patent JPH07136703
Kind Code:
A
Abstract:

PURPOSE: To reduce the generation of a flaw generated on an inner surface in the process of seamless rolling, to improve a quality, to improve a yield, and to enable to reduce the need of a flaw repair.

CONSTITUTION: This method is a rolling method in which graphite is supplied by making the inner part of a tube an oxidizing atmosphere in an elongator for rolling a tube manufactured by piercing a billet using a plug or a mandrel bar. A flaw generated on an inner surface is reduced by executing rolling while simultaneously supplying oxidizing gas and graphite, or supplying the graphite after supplying the oxidizing gas, or supplying the graphite with a material to be decomposed at the temperature of a rolled stock and generating oxygen previously mixed or contained.


Inventors:
Uchida, Hide
Yamamoto, Hiroyasu
Narasaki, Koji
Yoshioka, Takaoki
Yamamoto, Shuji
Hamauzu, Shuichi
Application Number:
JP1993000288540
Publication Date:
May 30, 1995
Filing Date:
November 17, 1993
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
B21B19/06; B21B25/00; B21B25/04; C10M103/02; C10N40/24; (IPC1-7): B21B25/04; B21B19/06; B21B25/00; C10M103/02