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C863
Manganese Bronze (High-Strength) Square Bar
C86300
Overview
C86300 is a high-strength manganese bronze offering the highest combination of strength and hardness among the manganese bronze family. With tensile strengths exceeding 110 ksi and excellent wear resistance, it is used for heavy-duty structural and bearing applications. The manganese and iron additions provide exceptional toughness and shock resistance, making it the material of choice for gears, cams, and heavy-duty wear components.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 60.00% | 66.00% |
| Zinc (Zn) | 22.00% | 28.00% |
| Aluminum (Al) | 5.00% | 7.50% |
| Iron (Fe) | 2.00% | 4.00% |
| Manganese (Mn) | 2.50% | 5.00% |
Alloy Designations
UNSC86300
ASTMB505, B584
TypeHigh-Strength Manganese Bronze
Mechanical Properties
Tensile Strength110 ksi (758 MPa) min
Yield Strength60 ksi (414 MPa) min
Elongation12% min
Hardness225 HB typical
Physical Properties
Density7.83 g/cm³ (0.283 lb/in³)
Melting Point871–879°C (1,600–1,615°F)
Electrical Conductivity8% IACS
Thermal Conductivity37.7 W/m·K
Typical Applications
- Heavy-duty gears and cams
- Bridge pins and structural hardware
- Screw-down nuts in steel mills
- Heavy-duty bearings and wear plates
- Marine hardware and fittings
- Shock-resistant components
Fabrication & Joining
- Not heat treatable
- Fair machinability — use carbide tooling
- Not recommended for welding
- Excellent wear and shock resistance
- Available in solid round, rectangle, and hollow
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