CMW® 28 Copper Alloy

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CMW® 28 Copper Alloy (discontinued **)
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	CMW® 28 material is a copper base alloy having very high electrical and thermal conductivity and medium strength and toughness. It is a heat treatable alloy and develops its strength and hardness through a combination of heat treatment and cold working. In more massive sections it will have reduced strength and hardness. CMW® 28 material is supplied in rod form. CMW® 28 material is used very successfully in the form of resistance welding electrodes. It is recommended for the welding of coated steel and materials of high conductivity excluding silver and copper. CMW® 28 material has a machinability rating of 20 with free cutting brass being 100. Information provided by CMW Inc. 1
Key Words:	UNS C15000 (Wrought)
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Physical Properties	Original Value	Comments

Density	8.89 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	70 @Diameter <=15.9 mm	Rod
Tensile Strength, Ultimate	455 MPa @Diameter <=15.9 mm	Rod
Tensile Strength, Yield	386 MPa @Diameter <=15.9 mm	Rod
Elongation at Break	10 % @Diameter <=15.9 mm	Rod
Modulus of Elasticity	130 GPa	Bar, Rod & Strip

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000192 ohm-cm	Bar & Rod (90% IACS)

Thermal Properties	Original Value	Comments
CTE, linear	16.3 µm/m-°C @Temperature 100 °C
Thermal Conductivity	367 W/m-K
Melting Point	980 - 1080 °C
Solidus	980 °C
Liquidus	1080 °C
Softening Point	500 °C	Permanent Softening

Component Elements Properties	Original Value	Comments
Copper, Cu	99.85 %
Zirconium, Zr	0.15 %

**
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NCMW067 / 15879

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