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UNS C97300 Leaded Nickel Silver

C97300 nickel silver is a copper-nickel alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C97300 is the UNS number for this material. Additionally, the common industry name is 12% Leaded Nickel Silver. Older literature may refer to this material as ASTM Alloy 10A, but this is now discouraged.

It has a fairly low base cost among cast copper-nickels. In addition, it has the lowest tensile strength and a fairly low melting temperature.

The graph bars on the material properties cards below compare C97300 nickel silver to: cast 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

110 GPa 16 x 106 psi

Elongation at Break

9.0 %

Poisson's Ratio

0.33

Shear Modulus

40 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

230 MPa 34 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

150 °C 300 °F

Melting Completion (Liquidus)

1040 °C 1900 °F

Melting Onset (Solidus)

1010 °C 1850 °F

Specific Heat Capacity

370 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

8.6 g/cm3 540 lb/ft3

Embodied Carbon

3.7 kg CO2/kg material

Embodied Energy

59 MJ/kg 25 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 MJ/m3

Resilience: Unit (Modulus of Resilience)

59 kJ/m3

Stiffness to Weight: Axial

7.0 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

7.6 points

Strength to Weight: Bending

9.8 points

Thermal Diffusivity

9.3 mm2/s

Thermal Shock Resistance

8.0 points

Alloy Composition

Among cast copper alloys, the composition of C97300 nickel silver is notable for containing comparatively high amounts of lead (Pb) and nickel (Ni). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting.

Copper (Cu) 53 to 58
Zinc (Zn) 17 to 25
Nickel (Ni) 11 to 14
Lead (Pb) 8.0 to 11
Tin (Sn) 1.5 to 3.0
Iron (Fe) 0 to 1.5
Antimony (Sb) 0 to 0.35
Silicon (Si) 0 to 0.15
Sulfur (S) 0 to 0.080
Phosphorus (P) 0 to 0.050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 1.0

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

Followup Questions

Similar Alloys

Further Reading

ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993