| 摘要 |
PCT No. PCT/EP79/00084 Sec. 371 Date Jun. 26, 1980 Sec. 102(e) Date Jun. 26, 1980 PCT Filed Oct. 26, 1979 PCT Pub. No. WO80/00084 PCT Pub. Date May 1, 1980.This invention relates to a capsule for pressings pressed by isostatic pressure and to these pressings used for extruding metallic objects, particularly tubes, of stainless steel, the outer and inner wall of the capsule consisting of thin-walled sheet metal, and at least the outer wall having substantially the same strength properties in the axial direction along its circumference and particularly consisting of a spiral-welded tube, and preferably at least on the front end of the capsule an insert being provided, which consists of one or more pieces of a ductile solid material or a ductile material pressed from powder. The invention further relates to a process for the production of such capsules and pressings and to a process for extruding tubes and to the tubes obtained according to this process.
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