Title:
METHOD AND APPARATUS FOR MAKING STEEL PIPE
Document Type and Number:
Japanese Patent JPS5449969
Kind Code:
A
Abstract:
A tube extrusion press extrudes tubes through the annular space formed when a mandrel projects into the aperture of an extrusion die. In order to prevent oxidation of the extruded product, the outside of the tube passes into a cooling section immediately downstream of the die, and a protective gas is blown into the interior of the tube through the mandrel which is hollow and has an opening in its tip. Both the inside and the outside of the tube may be coated with a liquid emulsion, and the hollow mandrel can have internal channels for the passage of a cooling liquid.
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Inventors:
FURANTSU YOOZERU TSUIRUGESU
HAINRITSUHI KUTSUTSU
HAINRITSUHI KUTSUTSU
Application Number:
JP10744178A
Publication Date:
April 19, 1979
Filing Date:
September 01, 1978
Export Citation:
Assignee:
SCHLOEMANN SIEMAG AG
International Classes:
B21C23/08; B21C23/21; B21C23/20; B21C29/00; B21C35/02; (IPC1-7): B21C23/08; B21C25/04
Domestic Patent References:
| JP17004013Y1 | ||||
| JP44032283A | ||||
| JP42004053A |