Beryllium-Copper Alloy 20C, UNS C82500, Cast and Aged

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Beryllium-Copper Alloy 20C, UNS C82500, Cast and Aged
Categories:	Metal; Nonferrous Metal; Beryllium Alloy; Copper Alloy; Copper Casting Alloy
Material Notes:	Casting methods recommended for this alloy: Centrifugal, Investment, Permanent Mold, Plaster, and Sand. Applications: Safety tools, molds for plastic parts, cams, bushings, valves, pump parts, and gears. Test specimen: cast and aged 3 hours at 345°C.
Key Words:	BeCu; beryllium copper 20C, standard beryllium copper casting alloy, CA 825, AMS 4890 (investment castings), FED QQ-C-390 (sand and centrifugal castings), MIL SPEC MIL-C-19464 (Class 2) sand castings, MIL-C-11866 (composition 17) and MIL-C-17324 precision castings, MIL-C-22087 investment castings, ICI-Cu-2-10780
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Physical Properties	Metric	English	Comments

Density	8.26 g/cc	0.298 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	30	30
Tensile Strength, Ultimate	825 MPa	120000 psi
Tensile Strength, Yield	725 MPa @Strain 0.2 %	105000 psi @Strain 0.2 %
Elongation at Break	2.0 %	2.0 %	In 50 mm
Modulus of Elasticity	128 GPa	18600 ksi
Compressive Yield Strength	1030 - 1200 MPa	149000 - 174000 psi	Permanent set of 0.1%
Poissons Ratio	0.30	0.30
Fatigue Strength	165 MPa @# of Cycles 5.00e+7	23900 psi @# of Cycles 5.00e+7	rotating beam; Temper Not Reported
Shear Modulus	50.0 GPa	7250 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000862 ohm-cm @Temperature 20.0 °C	0.0000862 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	105 W/m-K @Temperature 20.0 °C	729 BTU-in/hr-ft²-°F @Temperature 68.0 °F
Melting Point	835 °C	1540 °F	Incipient
	850 - 980 °C	1560 - 1800 °F
Solidus	855 °C	1570 °F
Liquidus	980 °C	1800 °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	1010 - 1065 °C	1850 - 1949 °F	Heavy castings
	1065 - 1175 °C	1949 - 2147 °F	Light castings

Component Elements Properties	Metric	English	Comments
Aluminum, Al	<= 0.15 %	<= 0.15 %
Beryllium, Be	1.9 - 2.15 %	1.9 - 2.15 %
Chromium, Cr	<= 0.10 %	<= 0.10 %
Cobalt, Co	0.35 - 0.70 %	0.35 - 0.70 %
Copper, Cu	>= 95.5 %	>= 95.5 %
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 %

References for this datasheet.

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