CMW® 328 Copper Alloy

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CMW® 328 Copper Alloy (discontinued **)
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	CMW® 328 material is a high strength, high conductivity copper base alloy. CMW® 328 is heat treatable. Optimum mechanical and physical properties of CMW® 328 material are developed by heat treatment or through a combination of heat treatment and cold working. CMW® 328 material is used extensively for cap style resistance welding electrodes. Evidence suggests that it can provide less sticking and resist deformation longer than its copper-chrome counterpart (CMW® 3) in some specific situations. CMW® 328 can be substituted for CMW® 3 in any structural or current carrying situation without fear of degrading the design. Information provided by CMW Inc. 1
Key Words:	UNS C18150 (Wrought)
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Physical Properties	Original Value	Comments

Density	8.90 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	75	Drawn Rod & Bar
Tensile Strength, Ultimate	455 MPa	Drawn Rod & Bar
Tensile Strength, Yield	425 MPa
Elongation at Break	19 %	Drawn Rod & Bar
Modulus of Elasticity	120 GPa	Bar, Rod & Strip

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000216 ohm-cm	Bar & Rod (80% IACS)

Thermal Properties	Original Value	Comments
CTE, linear	17.0 µm/m-°C @Temperature 100 °C
Thermal Conductivity	322 W/m-K
Melting Point	1075 - 1080 °C
Solidus	1075 °C
Liquidus	1080 °C
Softening Point	480 °C	Permanent Softening

Component Elements Properties	Original Value	Comments
Chromium, Cr	1.0 %
Copper, Cu	98.85 %
Zirconium, Zr	0.15 %

**
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NCMW068 / 15880

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