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EN 1652 Grade CuZn20Al2As (R390) – Superior Unhardenable Copper Alloy for Marine Applications

CuZn20Al2As (CW702R former identification: CuZn20Al2) is an unhardenable copper alloy. High hardness and strength values are achievable by cold forming only. Strength properties, corrosion resistance and oxidation resistance are increasable by Al-addition. CuZn20Al2As is seawater and dezincification resistant, and insensitive to stress corrosion in stress-relieved condition. Processing properties: warm forming: moderately cold forming: moderately machinability: moderately hard soldering: moderately soft soldering: unfavorable TIG-welding: good burnishing: very good The material is predominantly suitable for smooth and ribbed tubes and for heat-exchanger in condenser construction as well as for seawater pipelines. It is due to its favorable corrosion and erosion behaviour a reliable material in cooling water with salinities of more than 0,2%, e.g. in brack and seawater at water speed up to 2,5 m/s. In the case of a natural protective oxide film damage occurs a self-healing process.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.33 - 8.4 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

110 - 112 GPa

50.0 °C

110 - 130 GPa

100.0 °C

108 - 128 GPa

150.0 °C

107 - 126 GPa

200.0 °C

106 - 123 GPa

250.0 °C

105 - 120 GPa

300.0 °C

118 GPa

350.0 °C

115 GPa

400.0 °C

112 GPa

450.0 °C

109 GPa

500.0 °C

105 GPa

Elongation

20.0 °C

25 - 45 %

Elongation, transverse

20.0 °C

35 %

Hardness, Vickers

20.0 °C

110 [-]

Shear modulus

20.0 °C

42 GPa

Tensile strength

20.0 °C

390 MPa

Tensile strength, transverse

20.0 °C

390 MPa

Yield strength Rp0.2

10.0 °C

230 MPa

20.0 °C

150 - 240 MPa

50.0 °C

240 MPa

100.0 °C

230 MPa

150.0 °C

225 MPa

Yield strength Rp0.2, transverse

20.0 °C

240 MPa

50.0 °C

240 MPa

100.0 °C

230 MPa

150.0 °C

225 MPa

Yield strength Rp1.0

20.0 °C

160 MPa

50.0 °C

160 MPa

100.0 °C

148 MPa

150.0 °C

143 MPa

200.0 °C

138 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

200.0 °C

1.85E-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

100 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

1.34E+7 S/m

Electrical resistivity

20.0 °C

7.5E-8 Ω·m

Chemical properties

PropertyValue

Aluminium

1.8 - 2.3 %

Arsenic

0.02 - 0.06 %

Copper

76 - 79 %

Iron

0.07 %

Lead

0.05 - 0.07 %

Magnesium

5E-3 %

Manganese

0.1 %

Nickel

0.1 %

Phosphorus

0.01 %


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