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.
| Cu | 85 to 90 | |
| Ni | 4.5 to 6.0 | |
| Sn | 4.5 to 6.0 | |
| Zn | 1.0 to 2.5 | |
| Fe | 0 to 0.25 | |
| Mn | 0 to 0.2 | |
| Sb | 0 to 0.15 | |
| Pb | 0 to 0.1 | |
| P | 0 to 0.050 | |
| S | 0 to 0.050 | |
| Si | 0 to 0.0050 | |
| Al | 0 to 0.0050 | |
| res. | 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