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UNS C82600 (Alloy 245C) Beryllium Copper

C82600 copper is a lightly alloyed grade of copper, formulated for casting. C82600 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 245C or ASTM Alloy 245CT.

It has a very low melting temperature among cast coppers. In addition, it has a very low electrical conductivity and can have a very high tensile strength.

The properties of C82600 copper include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C82600 copper to: cast coppers (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

120 GPa 18 x 106 psi

Elongation at Break

1.0 to 20 %

Poisson's Ratio

0.33

Shear Modulus

46 GPa 6.6 x 106 psi

Tensile Strength: Ultimate (UTS)

570 to 1140 MPa 82 to 170 x 103 psi

Tensile Strength: Yield (Proof)

320 to 1070 MPa 47 to 160 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

300 °C 560 °F

Melting Completion (Liquidus)

950 °C 1750 °F

Melting Onset (Solidus)

860 °C 1570 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

130 W/m-K 73 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

19 % IACS

Electrical Conductivity: Equal Weight (Specific)

20 % IACS

Otherwise Unclassified Properties

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

11 kg CO2/kg material

Embodied Energy

180 MJ/kg 76 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 to 97 MJ/m3

Resilience: Unit (Modulus of Resilience)

430 to 4690 kJ/m3

Stiffness to Weight: Axial

7.8 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

18 to 36 points

Strength to Weight: Bending

17 to 28 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

19 to 39 points

Alloy Composition

Among cast copper alloys, the composition of C82600 copper is notable for including cobalt (Co) and beryllium (Be). Cobalt is used to improve strength. Beryllium is used to permit precipitation hardening (which increases strength) without much effect on electrical conductivity, but at the cost of substantial toxicity.

Copper (Cu) 94.9 to 97.2
Beryllium (Be) 2.3 to 2.6
Cobalt (Co) 0.35 to 0.65
Silicon (Si) 0.2 to 0.35
Iron (Fe) 0 to 0.25
Nickel (Ni) 0 to 0.2
Aluminum (Al) 0 to 0.15
Titanium (Ti) 0 to 0.12
Chromium (Cr) 0 to 0.1
Tin (Sn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Lead (Pb) 0 to 0.020
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015