Beryllium-Copper Alloy 20C, UNS C82500, TB00 Temper

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Beryllium-Copper Alloy 20C, UNS C82500, TB00 Temper
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: TB00 temper, solution treated at 790-800°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	Original Value	Comments

Density	8.26 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	63
Tensile Strength, Ultimate	415 MPa
Tensile Strength, Yield	170 MPa @Strain 0.2 %
Elongation at Break	35 %	In 50 mm
Modulus of Elasticity	128 GPa
Compressive Yield Strength	1030 - 1200 MPa	Permanent set of 0.1%
Poissons Ratio	0.30
Fatigue Strength	165 MPa @# of Cycles 5.00e+7	rotating beam; Temper Not Reported
Machinability	30 %	UNS C36000 (free-cutting brass) = 100%
Shear Modulus	50.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000862 ohm-cm @Temperature 20.0 °C

Thermal Properties	Original Value	Comments
CTE, linear	17.0 µm/m-°C @Temperature 20.0 - 200 °C
Specific Heat Capacity	0.420 J/g-°C
Thermal Conductivity	105 W/m-K @Temperature 20.0 °C
Melting Point	835 °C	Incipient
	850 - 980 °C
Solidus	855 °C
Liquidus	980 °C
Shrinkage	1.56 %	Patternmaker's Shrinkage (3/16 in./ft.)

Processing Properties	Original Value	Comments
Solution Temperature	790 - 800 °C
Aging Temperature	345 °C
Casting Temperature	1010 - 1065 °C	Heavy castings
	1065 - 1175 °C	Light castings

Component Elements Properties	Original Value	Comments
Aluminum, Al	<= 0.15 %
Beryllium, Be	1.9 - 2.15 %
Chromium, Cr	<= 0.10 %
Cobalt, Co	0.35 - 0.70 %
Copper, Cu	>= 95.5 %
Iron, Fe	<= 0.25 %
Lead, Pb	<= 0.020 %
Nickel, Ni	<= 0.20 %
Silicon, Si	0.20 - 0.35 %
Tin, Sn	<= 0.10 %
Zinc, Zn	<= 0.10 %

References for this datasheet.

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