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UNS C94700 Nickel-Tin Bronze

C94700 bronze is a bronze formulated for casting. C94700 is the UNS number for this material. Additionally, the common industry name is Nickel-Tin Bronze A. It has a moderately high base cost among the cast bronzes in the database.

The properties of C94700 bronze 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 C94700 bronze to: cast bronzes (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 17 x 106 psi

Elongation at Break

7.9 to 32 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Tensile Strength: Ultimate (UTS)

350 to 590 MPa 50 to 85 x 103 psi

Tensile Strength: Yield (Proof)

160 to 400 MPa 23 to 58 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

190 °C 380 °F

Melting Completion (Liquidus)

1030 °C 1880 °F

Melting Onset (Solidus)

900 °C 1660 °F

Specific Heat Capacity

380 J/kg-K 0.090 BTU/lb-°F

Thermal Conductivity

54 W/m-K 31 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

12 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

3.5 kg CO2/kg material

Embodied Energy

56 MJ/kg 24 x 103 BTU/lb

Embodied Water

350 L/kg 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

41 to 89 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 to 700 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

11 to 19 points

Strength to Weight: Bending

13 to 18 points

Thermal Diffusivity

16 mm2/s

Thermal Shock Resistance

12 to 21 points

Alloy Composition

Among cast copper alloys, the composition of C94700 bronze is notable for containing a comparatively high amount of nickel (Ni) and including manganese (Mn). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting. Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 85 to 90
Nickel (Ni) 4.5 to 6.0
Tin (Sn) 4.5 to 6.0
Zinc (Zn) 1.0 to 2.5
Iron (Fe) 0 to 0.25
Manganese (Mn) 0 to 0.2
Antimony (Sb) 0 to 0.15
Lead (Pb) 0 to 0.1
Phosphorus (P) 0 to 0.050
Sulfur (S) 0 to 0.050
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 1.3

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

Followup Questions

Similar Alloys

Further Reading

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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