Phosphorus Bronze

Phosphor bronzes have been around for a long time. In strip form, they are widely used for, among other things, electrical and electronic connectors. The alloys typically contain up to 10% tin and up to 0.35% phosphorus. They have excellent cold workability, that is, they can be cold rolled to thin sheet, and despite their relatively high strength, they can readily be shaped into connector components by bending. Being copper alloys, they have adequate electrical conductivity. Their fatigue strengths are high enough to make them suitable for applications where repetitive actions stress the components, as in fasteners, electrical connectors, springs, electrical switches and similar products.

Hence, conventional phosphor bronzes are a compromise, with optimum additions of phosphorus and tin to give as high a strength as possible coupled with a relatively high electrical conductivity. It should be noted that as the strength of the final rolled sheet material increases, in general so does its ability to retain most of that strength when operated at the temperature of switchgear

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