Beryllium-Copper Casting Alloy 275C, UNS C82800, As-Cast

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Beryllium-Copper Casting Alloy 275C, UNS C82800, As-Cast
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: as cast.
Key Words:	BeCu; beryllium copper 275C, CA 828, FED QQ-C-390, MIL-T-16243, MIL-C-19464 (Class IV), ICI-Cu-2-10786
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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 B	88	88
Tensile Strength, Ultimate	550 MPa	79800 psi
Tensile Strength, Yield	345 MPa @Strain 0.2 %	50000 psi @Strain 0.2 %
Elongation at Break	10 %	10 %	In 50 mm
Modulus of Elasticity	133 GPa	19300 ksi
Poissons Ratio	0.30	0.30
Machinability	30 %	30 %	UNS C36000 (free-cutting brass) = 100%
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 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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MC82800b2 / 11895

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