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UNS C72800 Tin-Bearing Copper-Nickel

C72800 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. It can have the highest tensile strength and has a moderately low melting temperature among wrought copper-nickels.

The properties of C72800 copper-nickel include seven common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C72800 copper-nickel to: wrought copper-nickels (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 17 x 106 psi

Elongation at Break

3.9 to 23 %

Poisson's Ratio

0.34

Rockwell C Hardness

21 to 40

Shear Modulus

44 GPa 6.4 x 106 psi

Shear Strength

330 to 740 MPa 48 to 110 x 103 psi

Tensile Strength: Ultimate (UTS)

520 to 1270 MPa 76 to 180 x 103 psi

Tensile Strength: Yield (Proof)

250 to 1210 MPa 36 to 180 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1080 °C 1980 °F

Melting Onset (Solidus)

920 °C 1680 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

55 W/m-K 32 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

11 % IACS

Otherwise Unclassified Properties

Base Metal Price

38 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

4.4 kg CO2/kg material

Embodied Energy

68 MJ/kg 29 x 103 BTU/lb

Embodied Water

360 L/kg 44 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

37 to 99 MJ/m3

Resilience: Unit (Modulus of Resilience)

260 to 5650 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

17 to 40 points

Strength to Weight: Bending

16 to 30 points

Thermal Diffusivity

17 mm2/s

Thermal Shock Resistance

19 to 45 points

Alloy Composition

Among wrought copper alloys, the composition of C72800 copper-nickel is notable for including sulfur (S) and bismuth (Bi). Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity. Bismuth improves machinability. It is used a non-toxic but more expensive replacement for lead.

Copper (Cu) 78.3 to 82.8
Nickel (Ni) 9.5 to 10.5
Tin (Sn) 7.5 to 8.5
Zinc (Zn) 0 to 1.0
Iron (Fe) 0 to 0.5
Niobium (Nb) 0.1 to 0.3
Manganese (Mn) 0.050 to 0.3
Magnesium (Mg) 0.0050 to 0.15
Aluminum (Al) 0 to 0.1
Silicon (Si) 0 to 0.050
Antimony (Sb) 0 to 0.020
Titanium (Ti) 0 to 0.010
Lead (Pb) 0 to 0.0050
Phosphorus (P) 0 to 0.0050
Sulfur (S) 0 to 0.0025
Bismuth (Bi) 0 to 0.0010
Boron (B) 0 to 0.0010
Residuals 0 to 0.3

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

Followup Questions

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