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CMW® 3 Copper Alloy  (discontinued **)
Categories: Metal; Nonferrous Metal; Copper Alloy

Material Notes: CMW® 3 material is a high strength, high conductivity copper base alloy. CMW® 3 material is heat treatable. Optimum mechanical and physical properties of CMW® 3 material are developed by heat treatment or through a combination of heat treatment and cold working.

CMW® 3 material is used extensively for spot welding electrodes and is well suited for custom bent designs, flash welding dies, and seam welding wheels, and provides better performance and greater savings than other copper alloys used for spot and seam welding.

Property data for fully precipitation heat treated condition.

Information provided by CMW Inc.

1

Key Words: UNS C18200 (Wrought); UNS C18500 (Cast)
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Physical PropertiesOriginal ValueComments
Density 8.89 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell B 68Forging (Hot Forged and Heat Treated)
 68Premium Casting
 78Premium Forging (Hot Forged, Heat Treated, and Cold Worked to less than 1" thick)
 80Strip (TH04)
 75
@Thickness <=25.0 mm
Plate
 83
@Diameter <=25.0 mm
Drawn Rod & Bar
Tensile Strength, Ultimate 345 MPaPremium Casting
 414 MPaForging (Hot Forged and Heat Treated)
 469 MPaPremium Forging (Hot Forged, Heat Treated, and Cold Worked to less than 1" thick)
 517 MPaStrip (TH04)
 448 MPa
@Thickness <=25.0 mm
Plate
 517 MPa
@Diameter <=25.0 mm
Drawn Rod & Bar
Tensile Strength, Yield 276 MPaPremium Casting
 298 MPaForging (Hot Forged and Heat Treated)
 414 MPaPremium Forging (Hot Forged, Heat Treated, and Cold Worked to less than 1" thick)
 482 MPaStrip (TH04)
 379 MPa
@Thickness <=25.0 mm
Plate
 482 MPa
@Diameter <=25.0 mm
Drawn Rod & Bar
Elongation at Break 3.0 %Strip (TH04)
 17 %Premium Forging (Hot Forged, Heat Treated, and Cold Worked to less than 1" thick)
 20 %Premium Casting
 28 %Forging (Hot Forged and Heat Treated)
 20 %
@Thickness <=25.0 mm
Plate
 15 %
@Diameter <=25.0 mm
Drawn Rod & Bar
Reduction of Area 45 %Premium Casting
 65 %Premium Forging (Hot Forged, Heat Treated, and Cold Worked to less than 1" thick)
 73 %Forging (Hot Forged and Heat Treated)
 60 %
@Diameter <=25.0 mm
Drawn Rod & Bar
Modulus of Elasticity 110 GPaBar, Rod & Forgings
 110 GPaCastings & Strip
 114 GPaPlate
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.00000203 ohm-cmBar, Rod & Forgings (85 % IACS)
 0.00000216 ohm-cmCastings & Strip (80 % IACS)
 0.00000221 ohm-cmPlate (78 % IACS)
 
Thermal PropertiesOriginal ValueComments
CTE, linear 17.6 µm/m-°C
@Temperature 100 °C
Thermal Conductivity 324 W/m-K
Melting Point 1070 - 1075 °C
Solidus 1070 °C
Liquidus 1075 °C
Softening Point 500 °CPermanent Softening
 
Component Elements PropertiesOriginal ValueComments
Chromium, Cr 0.90 %
Copper, Cu 99.1 %

**
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NCMW066 / 15878

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