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C630
Nickel Aluminum Bronze (630) Round Bar
C63000 (AMS 4640)
Overview
C63000 is a wrought nickel aluminum bronze offering the highest strength of any standard wrought copper alloy — exceeding 90 ksi tensile strength. The combination of 10% aluminum and 5% nickel provides exceptional strength, wear resistance, and corrosion resistance, particularly in seawater and marine environments. C630 meets AMS 4640 for aerospace applications and is widely specified for aircraft landing gear bushings, valve components, and heavy-duty wear parts.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | Balance (~78%) | — |
| Aluminum (Al) | 9.00% | 11.00% |
| Iron (Fe) | 2.00% | 4.00% |
| Nickel (Ni) | 4.00% | 5.50% |
Alloy Designations
UNSC63000
AMS4640
ASTMB150
TypeWrought Nickel Aluminum Bronze
Mechanical Properties
Tensile Strength (H04)90 ksi (620 MPa) min
Yield Strength (H04)55 ksi (379 MPa) min
Elongation (H04)6% min
Hardness (H04)Rockwell B95
Physical Properties
Density7.58 g/cm³ (0.274 lb/in³)
Melting Point1,038–1,060°C (1,900–1,940°F)
Electrical Conductivity7% IACS
Thermal Conductivity39.3 W/m·K
Typical Applications
- Aircraft landing gear bushings (AMS 4640)
- Valve stems and seats
- Heavy-duty wear rings and bearing plates
- Marine propeller shafts
- Pump impellers and wear parts
- Structural fasteners for marine environments
Fabrication & Joining
- Hot forging: Excellent
- Cold working: Limited (hard alloy)
- Weldable with proper technique and filler
- Machinability: Fair — use carbide tools
- Available in bar, rod, and forgings
- Meets AMS 4640 for aerospace applications