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Application filed by بك ب ال سي, ريجنالد فيرى نورمانfiledCriticalبك ب ال سي
Priority to JO19821218ApriorityCriticalpatent/JO1218B1/en
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Publication of JO1218B1publicationCriticalpatent/JO1218B1/en
In continuous friction-actuated extrusion, especially conform extrusion of copper, at least part of the tooling is made from aged nickel- chromium base alloy (which is preferably cold-worked before aging to give a yield strength of at least 1500 MN/m<2> at 20 DEG C) and which is capable of sustaining an adherent oxide film. The preferred alloy is Inconel Alloy 718 (Inconel is a Registered Trade Mark). Despite lower hardness, the tooling has better service life than conventional special- steel tooling.