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C955
Nickel Aluminum Bronze
C95500
Overview
C95500 is a nickel-aluminum bronze with the highest strength and hardness in the aluminum bronze family. The nickel addition enhances corrosion resistance (especially in seawater), improves high-temperature strength, and provides superior wear resistance. It is the premier alloy for marine, aerospace, and heavy-duty industrial applications requiring the ultimate combination of strength, wear, and corrosion resistance.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 78.00% | — |
| Aluminum (Al) | 10.00% | 11.50% |
| Iron (Fe) | 3.00% | 5.00% |
| Nickel (Ni) | 3.00% | 5.50% |
| Manganese (Mn) | — | 3.50% |
Alloy Designations
UNSC95500
ASTMB505, B148
TypeNickel Aluminum Bronze
Mechanical Properties
Tensile Strength (as-cast)90 ksi (620 MPa) min
Yield Strength (as-cast)40 ksi (276 MPa) min
Tensile Strength (HT)110 ksi (758 MPa) min
Yield Strength (HT)60 ksi (414 MPa) min
Elongation6% min
Hardness195 HB (as-cast), 230 HB (HT)
Physical Properties
Density7.53 g/cm³ (0.272 lb/in³)
Melting Point1,038–1,060°C (1,900–1,940°F)
Electrical Conductivity8.5% IACS
Thermal Conductivity41.9 W/m·K
Typical Applications
- Marine propellers and propeller nuts
- Heavy-duty bearings for mining and steel mills
- Valve seats for corrosive media
- Aerospace landing gear bushings
- Pump impellers for seawater service
- High-load, high-wear bearings
Fabrication & Joining
- Heat treatable for maximum strength
- Good machinability
- Welding: Fair — preheat recommended
- Outstanding seawater corrosion resistance
- Premium alloy — higher cost justified by performance