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EN 12164 Grade CuZn40 R400 – High-Strength, Cold-Formable Copper Alloy

CuZn40 (CW509L) is an unhardenable wrought alloy. High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are lower than for CuZn37. Corrosion resistance is similar to pure copper. Processing properties: warm forming: very good cold forming: good machinability: moderately hard soldering: good soft soldering: very good TIG-welding: moderately burnishing: very good CuZn40 is used for hot-pressed forgings, metal fitting and lock components, for nipple wire, condenser bottoms and watchcases.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.4 - 8.41 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-195.0 °C

108 GPa

-100.0 °C

106 GPa

20.0 °C

102 - 105 GPa

50.0 °C

100 GPa

100.0 °C

93 - 99 GPa

150.0 °C

91 GPa

200.0 °C

89 - 94 GPa

250.0 °C

83 GPa

300.0 °C

89 GPa

400.0 °C

83 GPa

500.0 °C

74 GPa

600.0 °C

64 GPa

700.0 °C

54 GPa

Elongation

20.0 °C

20 - 23 %

Elongation A50

20.0 °C

15 %

Elongation, transverse

20.0 °C

23 %

Poisson's ratio

20.0 °C

0.34 [-]

Shear modulus

20.0 °C

37 GPa

Tensile strength

20.0 °C

400 - 480 MPa

Tensile strength, transverse

20.0 °C

400 MPa

Yield strength Rp0.2

20.0 °C

190 - 250 MPa

50.0 °C

250 MPa

100.0 °C

225 MPa

150.0 °C

200 MPa

Yield strength Rp0.2, transverse

20.0 °C

240 MPa

50.0 °C

240 MPa

100.0 °C

220 MPa

150.0 °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

375 - 377 J/(kg·K)

Thermal conductivity

20.0 °C

109 - 117 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.39E+7 - 1.50E+7 S/m

Electrical resistivity

20.0 °C

6.7E-8 Ω·m

Specific Electrical conductivity

24 - 26 % IACS

Chemical properties

PropertyValue

Aluminium

0.05 %

Copper

59 - 61.5 %

Iron

0.2 %

Lead

0.2 - 0.3 %

Nickel

0.3 %

Tin

0.2 %


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