Chromium Copper, UNS C18400

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Chromium Copper, UNS C18400
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	Good to excellent corrosion resistance. Excellent cold workability; good hot workability. Applications: resistance welding electrodes, seam welding wheels, switch gear, electrode holder jaws, cable connectors, current carrying arms and shafts, circuit breaker parts, molds, spot welding tips, flash welding electrodes, electrical and thermal conductors requiring strength, switch contacts. Available as flat products, wire, rod, tube, and shapes. UNS C18200, UNS C18400, and UNS C18500 have similar compositions and mechanical properties.
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Physical Properties	Original Value	Comments

Density	8.89 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	234 - 593 MPa
Tensile Strength, Yield	97.0 - 531 MPa	Depending on temper
Elongation at Break	40 %	in 127 mm (2in.).
Modulus of Elasticity	130 GPa
Poissons Ratio	0.30	Calculated
Machinability	20 %	UNS C36000 (free-cutting brass) = 100%
Forgeability	80 %
Shear Modulus	50.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000220 ohm-cm	80% IACS

Thermal Properties	Original Value	Comments
CTE, linear	17.6 µm/m-°C @Temperature 20.0 - 100 °C
Specific Heat Capacity	0.0920 BTU/lb-°F
Thermal Conductivity	171 W/m-K @Temperature 20.0 °C	TB00 temper
	324 W/m-K @Temperature 20.0 °C	TH04 temper
Melting Point	1070 - 1075 °C
Solidus	1070 °C
Liquidus	1075 °C

Processing Properties	Original Value	Comments
Precipitation Temperature	860 °F @Time 180 sec	Air

Component Elements Properties	Original Value	Comments
Arsenic, As	<= 0.0050 %
Calcium, Ca	<= 0.0050 %
Chromium, Cr	0.40 - 1.2 %
Copper, Cu	99.2 %
Iron, Fe	<= 0.15 %
Lithium, Li	<= 0.050 %
Other, total	<= 0.20 %
Phosphorus, P	<= 0.050 %
Silicon, Si	<= 0.10 %
Zinc, Zn	<= 0.70 %

References for this datasheet.

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MC18400b1 / 10770

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