Beryllium-Copper Casting Alloy 275C, UNS C82800, Cast and Aged

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Beryllium-Copper Casting Alloy 275C, UNS C82800, Cast and Aged
Categories:	Metal; Nonferrous Metal; Copper Alloy; Copper Casting Alloy
Material Notes:	Casting methods recommended for this alloy: Centrifugal, Investment, Permanent Mold, Plaster, and Sand. Applications: Bearings and molds for plastic parts. Test specimen: cast and aged 3 hours at 345°C.
Key Words:	BeCu; beryllium copper 275C, CA 828, FED QQ-C-390, MIL-T-16243, MIL-C-19464 (Class IV), ICI-Cu-2-10787
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Physical Properties	Metric	English	Comments

Density	8.09 g/cc	0.292 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	31	31
Tensile Strength, Ultimate	860 MPa	125000 psi
Tensile Strength, Yield	760 MPa @Strain 0.2 %	110000 psi @Strain 0.2 %
Elongation at Break	2.0 %	2.0 %	In 50 mm
Modulus of Elasticity	133 GPa	19300 ksi
Poissons Ratio	0.30	0.30
Shear Modulus	51.0 GPa	7400 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000958 ohm-cm @Temperature 20.0 °C	0.0000958 ohm-cm @Temperature 68.0 °F

Thermal Properties	Metric	English	Comments
CTE, linear	17.0 µm/m-°C @Temperature 20.0 - 200 °C	9.44 µin/in-°F @Temperature 68.0 - 392 °F
Specific Heat Capacity	0.420 J/g-°C	0.100 BTU/lb-°F
Thermal Conductivity	95.0 W/m-K @Temperature 20.0 °C	659 BTU-in/hr-ft²-°F @Temperature 68.0 °F
Melting Point	855 °C	1570 °F	Incipient
	860 - 930 °C	1580 - 1710 °F
Solidus	835 °C	1540 °F
Liquidus	930 °C	1710 °F
Shrinkage	1.56 %	1.56 %	Patternmaker's Shrinkage (3/16 in./ft.)

Processing Properties	Metric	English	Comments
Solution Temperature	790 - 800 °C	1450 - 1470 °F
Aging Temperature	345 °C	653 °F
Casting Temperature	965 - 1040 °C	1770 - 1900 °F	Heavy castings
	1040 - 1150 °C	1900 - 2100 °F	Light castings

Component Elements Properties	Metric	English	Comments
Aluminum, Al	<= 0.15 %	<= 0.15 %
Beryllium, Be	2.5 - 2.75 %	2.5 - 2.75 %
Chromium, Cr	<= 0.10 %	<= 0.10 %
Cobalt, Co	0.37 - 0.70 %	0.37 - 0.70 %
Copper, Cu	>= 94.8 %	>= 94.8 %
Iron, Fe	<= 0.25 %	<= 0.25 %
Lead, Pb	<= 0.020 %	<= 0.020 %
Nickel, Ni	<= 0.20 %	<= 0.20 %
Silicon, Si	0.20 - 0.35 %	0.20 - 0.35 %
Tin, Sn	<= 0.10 %	<= 0.10 %
Zinc, Zn	<= 0.10 %	<= 0.10 %

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MC82800b3 / 11896

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