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C642
Silicon Aluminum Bronze
C64200
Overview
C64200 is a silicon aluminum bronze offering high strength (tensile strengths up to 95 ksi), excellent wear resistance, and superior corrosion resistance in aggressive environments. It combines the corrosion resistance of silicon bronze with the strength and wear properties of aluminum bronze. C642 is widely used for valve stems, gears, and components requiring high strength with corrosion resistance in marine and industrial chemical environments.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | Balance (~91%) | — |
| Aluminum (Al) | 6.30% | 7.60% |
| Silicon (Si) | 1.50% | 2.20% |
Alloy Designations
UNSC64200
AMS4634
ASTMB150
TypeSilicon Aluminum Bronze
Mechanical Properties
Tensile Strength75–95 ksi (517–655 MPa)
Yield Strength35–55 ksi (241–379 MPa)
Elongation15%
Hardness85 HRB
Physical Properties
Density7.70 g/cm³ (0.278 lb/in³)
Melting Point982–1,027°C (1,800–1,880°F)
Electrical Conductivity7% IACS
Thermal Conductivity33.5 W/m·K
Typical Applications
- Valve stems and valve components
- Gears and pinions
- Pump shafts
- Marine hardware
- Aerospace structural components
- Corrosion-resistant fasteners
Fabrication & Joining
- Good machinability with carbide tooling
- Hot forging: Good
- Weldable with proper filler metal
- Excellent corrosion resistance
- Available in bar, rod, and forgings
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