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EN 12451 Grade CuZn28Sn1As O60 – Unhardenable Copper Alloy for High Strength and Corrosion Resistance

CuZn28Sn1As (CW706R former identification: CuZn28Sn1) is an unhardenable copper alloy. High hardness and strength parameter are achievable by cold forming only. Tin increases corrosion resistance and improves sliding qualities. CuZn28Sn1As is dezincification resistant and resistant to river and industrial water. Processing properties: warm forming: good cold forming: moderately machinability: moderately hard soldering: moderately soft soldering: very good TIG-welding: good burnishing: very good This special brass material is predominantly applicated in the form of tubes for freshwater carrying pipes or for heat-exchanger. To the operating conditions applies that the content of solute substances in cooling water is not allowed to exceed 0,1% and the pH-value for water is not allowed to decrease below 7,0. In the case of corrosion attack due to sedimentations tubes made of CW706R are more resistant than tubes of binary copper-zinc alloys. The material is applicable for water speeds up to 2m/s. Further application for bottoms and plates for condenser and other heat-transformer, ribbed tubes as well as for cooler in on shore appliances.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.56 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-253.0 °C

119 GPa

-195.0 °C

116 GPa

-100.0 °C

112 GPa

20.0 °C

108 - 110 GPa

50.0 °C

108 GPa

100.0 °C

108 GPa

150.0 °C

101 GPa

200.0 °C

94 GPa

250.0 °C

87 GPa

Elongation

20.0 °C

45 - 55 %

Hardness, Vickers

20.0 °C

60 - 110 [-]

Shear modulus

20.0 °C

41 GPa

Tensile strength

20.0 °C

320 - 360 MPa

Yield strength Rp0.2

20.0 °C

100 - 140 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

200.0 °C

1.95E-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

20.0 °C

109 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.41E+7 S/m

Electrical resistivity

20.0 °C

7.1E-8 Ω·m

Specific Electrical conductivity

24 % IACS

Chemical properties

PropertyValue

Arsenic

0.02 - 0.06 %

Copper

70 - 72.5 %

Iron

0.07 %

Lead

0.05 - 0.07 %

Manganese

0.1 %

Nickel

0.1 %

Phosphorus

0.01 %

Tin

0.9 - 1.3 %


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