Method of making hollow bodies

Details Method of making hollow bodies Method of making hollow bodies

C - Chemistry, Metallurgy

22

C

C22C 21/10 (2006.01) B21C 23/20 (2006.01) C22F 1/053 (2006.01) F17C 1/14 (2006.01)

Patent

CA 2159193

A method of making a pressurised gas cylinder comprises providing an ingot of composition (in wt. %): Zn 5.0 - 7.0; Mg 1.5 - 3.0; Cu 1.0 - 2.7; recrystallisation inhibitor 0.05 - 0.40; Fe up to 0.30; Si up to 0.15; other impurities up to 0.05 each and 0.15 in total, balance Al of at least commercial purity, if necessary homogenising the ingot at a temperature of at least 470 °C and for a time sufficient to reduce die volume fraction of S phase to a value below 1.0%, extruding the ingot preferably by cold backward extrusion, and forming and over-ageing the resulting pressurised gas cylinder.

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