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| ALLOY TEMPER |
Beryllium copper alloys derive their high strength through heat treatment and, in the case of small cross section wrought forms, cold working. The amount of cold work and the type of heat treatment determine the alloy’s properties. The combination of cold work and heat treatment define the alloy’s temper. A brief definition of the temper designations is provided below.
Brush Wellman supplies wrought products in either age hardenable or mill hardened tempers. The age hardenable tempers require heat treatment by the user after forming or machining operations. The mill hardened tempers are heat treated before they leave the supplier. The specific machining operation and application requirements determine if the alloy is machined before or after heat treating. The heat treatment (age hardening) of the high strength beryllium copper alloys is accompanied by a slight volume change. These alloys shrink about 0.5 volumetric percent. Where precise dimensional control is required, final machining should follow heat treatment. Rough machining can, of course, be done before heat treating. The high conductivity beryllium copper alloys are usually purchased in mill hardened tempers and are readily machinable because-of their moderate hardness levels. There is no volume change during the heat treatment of the high conductivity alloys. |
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