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EN 12164 R430 – CuZn40Pb2 Leaded Brass: Superior Machinability & Cold‑Forming Performance

Material CuZn40Pb2, mat. No. CW617N, is an unhardenable wrought alloy. to the comparable make CuZn40Pb2, mat. No. 2.0402 acc. to DIN 17660 : 1983-12 applies: High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are lower than for CuZn40. Machinability is improved by Pb-addition. Corrosion resistance to water, several saline solutions and organic liquids is also lower than for unleaded alloys of the same zinc-content. Processing properties: warm forming: very good cold forming: unfavorable machinability: very good hard soldering: moderately soft soldering: very good TIG-welding: unfavorable burnishing: very good Application: for hot-pressed components, turned parts for precision engineering and optics, circuit boards and clockwerks as well as for clamps for electrical engineering.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.4 - 8.44 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

96 - 97 GPa

Elongation

20.0 °C

10 - 12 %

Elongation A10

20.0 °C

8 %

Elongation A100

20.0 °C

6 - 8 %

Elongation A11.3

20.0 °C

8 - 10 %

Shear modulus

23.0 °C

40 GPa

Typical for Wrought Copper Brass

Tensile strength

20.0 °C

430 MPa

Yield strength Rp0.2

20.0 °C

6 - 250 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

2E-5 1/K

300.0 °C

2.1E-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

113 - 123 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.49E+7 - 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

Specific Electrical conductivity

25 - 25.7 % IACS

Chemical properties

PropertyValue

Aluminium

0.05 %

Copper

57 - 59 %

Iron

0.3 %

Lead

1.6 - 2.5 %

Nickel

0.3 %

Tin

0.3 %


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