Phosphor Bronze Wire

At SMI, we manufacture phosphor bronze wires, an alloy of copper, tin and phosphorous. Our phosphor bronze wires possess excellant spring qualities, high corrosion resistance and good formability. While tin increases the strength of the material, phosphor increases its corrosion resistance and stiffness. Hence phosphor bronze, based on its varying content of tin are used in various electrical and industrial applications.

Alloy name and chemical composition

Alloy	CSL Alloys	ISO	German	USA		Chemical composition
			DIN	ASTM	JIS	Sn	P	Cu
Phosphor Bronze	PB 1%	IS 7608, IS7611 & IS7811 Grade I, II, III & IS10710 Grade I & II	–	C50500		0.5-1.5%	0.02-0.4%	Rem.
	PB 4%		CuSn4	C51100	C51100	3.5-4.5%	0.02-0.4%	Rem.
	PB 5%		CuSn5	C51000	C5102	4.5-5.5%	0.02-0.4%	Rem.
	PB 6%		CuSn6	C51900	C5191	5.5-7.0%	0.02-0.4%	Rem.
	PB 8%		CuSn8	C52100	C5210	7.5-9.0 %	0.02-0.4%	Rem.

Applications:

Electrical springs and connectors,switch parts, fasteners, machinery, washers, cold headed parts, wire brushes, etc