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EN 12166 Grade CuZn20 H58 – High‑Strength, Unhardenable Copper Alloy

CuZn20 (CW503L) is an unhardenable wrought alloy. High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are worse than for CuZn15. Corrosion resistance is similar to pure copper. Processing properties: warm forming: moderately cold forming: good machinability: moderately hard and soft soldering: very good TIG-welding: good burnishing: very good CuZn20 is used for metal goods, in jewelry industry and automotive electrics as well as for metall hoses and manometer. 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

8.67 - 8.7 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

119 GPa

100.0 °C

116 GPa

200.0 °C

111 GPa

300.0 °C

106 GPa

400.0 °C

100 GPa

500.0 °C

91 GPa

600.0 °C

81 GPa

700.0 °C

71 GPa

Poisson's ratio

20.0 °C

0.34 [-]

Shear modulus

20.0 °C

44 GPa

Tensile strength

50.0 °C

295 MPa

100.0 °C

285 MPa

150.0 °C

278 MPa

200.0 °C

267 MPa

250.0 °C

253 MPa

300.0 °C

240 MPa

350.0 °C

220 MPa

400.0 °C

200 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

1.7E-5 - 2.1E-5 1/K

Typical for Wrought Copper Brass

Melting point

875 - 1075 °C

Typical for Wrought Copper Brass

Specific heat capacity

20.0 °C

377 - 380 J/(kg·K)

100.0 °C

398 J/(kg·K)

200.0 °C

410 J/(kg·K)

300.0 °C

419 J/(kg·K)

400.0 °C

431 J/(kg·K)

Thermal conductivity

20.0 °C

142 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.90E+7 S/m

Electrical resistivity

20.0 °C

5.3E-8 Ω·m

Specific Electrical conductivity

33 % IACS

Chemical properties

PropertyValue

Aluminium

0.02 %

Copper

79 - 81 %

Iron

0.05 %

Lead

0.05 %

Nickel

0.3 %

Tin

0.1 %


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