Shanghai Unique Alloy Co.Ltd 

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C52100 Phosphor Bronze


CuSn8 - UNS.C52100 Phosphor Bronze Alloys, which is a 8% tin bronze distinguished by a very good combination of strength and electrical conductivity. It is used for connector and current-carrying springs in contacts. Among the 4-8% tin bronze C52100 exhibits the lowest electrical conductivity, the highest reachable strength is significantly higher than C51100 and C51000 and C51900. By means of an additional further tempering after the cold forming process the bendability can be further improved.
In addition, it has better corrosion resistance and good sliding properties. C52100 is used for springy components and sliding elements when increased strength and wear-resistance are required.


Available Products (forms):
Round bars, Flat bars, Square bars, Round Wires, Round Strips
Custom shapes are available upon request.


Chemical Composition:

Sn: 7.50-8.50%
P:  0.03-0.35%
Zn: 0.20% Max.
Fe: 0.10% Max.
Pb: 0.05% Max.
Zn: Balance

Note: Copper plus additions equal 99.50% minimum.


Typical Physical Properties:

Specific Gravity: 8.80 g/cm3
Coefficient of Thermal Expansion per °C: 18.20 x 10-6 (20-300°C)
Electrical Conductivity (% IACS): 13.00 % @ 68 F
Thermal Conductivity: 36.00 Btu · ft/(hr · ft2·oF)at 68F
Modulus of Elasticity in tension: 16000 ksi

1). the units are based upon US Customary.
2). the typical physical properties apply to age hardened products.

International Specification:

Rods/Bars/Strips: UNS.C52100, CDA521, ASTM B139, B103, B888, B159
European Standards: CuSn6, JIS C5210, CW 453 K, PB 104