Method of making pipes by powder metallurgy and pipe blanks...

Details Method of making pipes by powder metallurgy and pipe blanks... Method of making pipes by powder metallurgy and pipe blanks...

B - Operations, Transporting

22

F

18/1119, 205/5

B22F 3/20 (2006.01) B22F 3/04 (2006.01) B22F 3/12 (2006.01)

Patent

CA 1228707

Abstract of the Invention A method of making pipes by powder metallurgy, in which powder of metal and/or metal alloys is filled into a thin-walled casing consisting of inner pipe wall outer pipe wall and a bottom , subsequently the casing is closed on its side remote from the bottom by an annular cover and is subjected to a cold-isostatic pressure whereby the powder is compacted within the casing to produce a solid or dimensionally stable pipe blank or compact , which is then hot-worked, e.g. extruded. In order to prevent thermal cracks on the inner pipe or inner pipe wall , especially in the region of the ends thereof, the inner pipe or inner pipe wall is provided prior to hot-working on at least one end region thereof with at least one circumferentially extending bulge

466063

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