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C907
Tin Bronze / Gun Metal (907)
C90700
Overview
C90700 is a higher-tin content bronze (11% Sn) providing superior wear resistance and strength compared to C90500. This alloy is particularly suited for gear applications, heavy-duty bearings, and components subject to high sliding loads. Its excellent resistance to corrosion and cavitation makes it a preferred choice for marine propeller bushings and pump wear rings.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 87.00% | 89.00% |
| Tin (Sn) | 10.00% | 12.00% |
| Zinc (Zn) | — | 0.50% |
Alloy Designations
UNSC90700
ASTMB505, B584
Common NameTin Bronze (High-Tin)
Mechanical Properties
Tensile Strength44 ksi (303 MPa) min
Yield Strength22 ksi (152 MPa) min
Elongation10% min
Hardness80 HB typical
Physical Properties
Density8.77 g/cm³ (0.317 lb/in³)
Melting Point832–998°C (1,530–1,828°F)
Electrical Conductivity10% IACS
Thermal Conductivity71.1 W/m·K
Typical Applications
- Gears and worm wheels
- Heavy-duty bearings
- Piston rings for hydraulic cylinders
- Marine propeller bushings
- Pump wear rings
- Anti-friction bearings
Fabrication & Joining
- Good machinability
- Soldering: Good
- Brazing: Fair
- Higher tin content provides superior wear resistance
- Available in continuous cast and centrifugal cast