Beryllium-Copper Alloy 50C, UNS C81800, As-cast

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Beryllium-Copper Alloy 50C, UNS C81800, As-cast
Categories:	Metal; Nonferrous Metal; Beryllium Alloy; Copper Alloy; Copper Casting Alloy
Material Notes:	Casting methods recommended for this alloy: Centrifugal, Continuous, Investment, Permanent Mold, Plaster, and Sand. Applications: Resistance welding electrodes, dies Test specimen: as cast. Inactive per the Copper Development Association.
Key Words:	BeCu; beryllium copper alloy 50C, CA 818, RWMA Class III
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Physical Properties	Metric	English	Comments

Density	8.62 g/cc	0.311 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	50	50
Tensile Strength, Ultimate	345 MPa	50000 psi
Tensile Strength, Yield	140 MPa @Strain 0.2 %	20300 psi @Strain 0.2 %
Elongation at Break	20 %	20 %	In 50 mm
Modulus of Elasticity	110 GPa	16000 ksi
Poissons Ratio	0.33	0.33
Machinability	30 %	30 %	UNS C36000 (free-cutting brass) = 100%
Shear Modulus	41.0 GPa	5950 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000359 ohm-cm @Temperature 20.0 °C	0.0000359 ohm-cm @Temperature 68.0 °F

Thermal Properties	Metric	English	Comments
CTE, linear	18.0 µm/m-°C @Temperature 20.0 - 300 °C	10.0 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.420 J/g-°C	0.100 BTU/lb-°F
Thermal Conductivity	218 W/m-K @Temperature 20.0 °C	1510 BTU-in/hr-ft²-°F @Temperature 68.0 °F
Melting Point	1010 - 1070 °C	1850 - 1960 °F
Solidus	1010 °C	1850 °F
Liquidus	1070 °C	1960 °F
Shrinkage	1.56 %	1.56 %	Patternmaker's Shrinkage (3/16 in./ft.)

Processing Properties	Metric	English	Comments
Solution Temperature	900 - 925 °C	1650 - 1700 °F
Aging Temperature	480 °C	896 °F
Casting Temperature	1120 - 1175 °C	2050 - 2147 °F	Heavy castings
	1175 - 1230 °C	2147 - 2250 °F	Light castings

Component Elements Properties	Metric	English	Comments
Aluminum, Al	<= 0.10 %	<= 0.10 %
Beryllium, Be	0.30 - 0.55 %	0.30 - 0.55 %
Chromium, Cr	<= 0.10 %	<= 0.10 %
Cobalt, Co	1.4 - 1.7 %	1.4 - 1.7 %
Copper, Cu	>= 95.6 %	>= 95.6 %
Iron, Fe	<= 0.10 %	<= 0.10 %
Lead, Pb	<= 0.0020 %	<= 0.0020 %
Nickel, Ni	<= 0.20 %	<= 0.20 %
Silicon, Si	<= 0.15 %	<= 0.15 %
Silver, Ag	0.080 - 0.12 %	0.080 - 0.12 %
Tin, Sn	<= 0.10 %	<= 0.10 %
Zinc, Zn	<= 0.10 %	<= 0.10 %

References for this datasheet.

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MC81800b2 / 11862

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