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EN 12166: CuZn37 (H08) – High‑Performance Copper Alloy for Cold Forming and Corrosion Resistance

CuZn37 (CW508L) is an unhardenable wrought alloy. High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are lower than for CuZn36. CuZn37 is the main alloy for cold forming. It shows favorable corrosion resistance to fresh water. Processing properties: warm forming: good cold forming: very good machinability: moderately hard soldering: good soft soldering: very good TIG-welding: moderately burnishing: very good CuZn37 is used for bulb bases, wire clamps for aerial lines, contact springs, metal and wooden screws, print roller and zip fastener. For the electrolytically tinned strip the coatings (Sn bright, Sn matt, Sn fuzed, SnPb) are listed by the application (better solderability, better corrosion resistance, reduction of the electrical contact resistance, better appearance) in the DIN EN 14436 : 2004-11 (Table 5)

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.44 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

110 GPa

100.0 °C

106 GPa

200.0 °C

102 GPa

300.0 °C

97 GPa

400.0 °C

89 GPa

500.0 °C

79 GPa

Hardness, Vickers

20.0 °C

190 [-]

Shear modulus

23.0 °C

40 GPa

Typical for Wrought Copper Brass

Tensile strength

20.0 °C

700 - 800 MPa

Yield strength Rp0.2

20.0 °C

710 - 810 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

150.0 °C

1.9E-5 1/K

300.0 °C

2.1E-5 1/K

650.0 °C

2.3E-5 1/K

800.0 °C

2.4E-5 1/K

Melting point

875 - 1075 °C

Typical for Wrought Copper Brass

Specific heat capacity

20.0 °C

377 J/(kg·K)

Thermal conductivity

-200.0 °C

50 W/(m·K)

20.0 °C

120 W/(m·K)

200.0 °C

142 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.50E+7 S/m

200.0 °C

1.20E+7 S/m

Electrical resistivity

20.0 °C

6.6E-8 Ω·m

200.0 °C

8.3E-8 Ω·m

Chemical properties

PropertyValue

Aluminium

0.05 %

Copper

62 - 64 %

Iron

0.1 %

Lead

0.1 %

Nickel

0.3 %

Tin

0.1 %


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