C67300 Manganese Bronze Bushing
C67300 Manganese Bronze Bushing
Self-lubricating bronze bearings are engineered for applications where external lubrication is impractical. Solid lubricants are compressed and molded directly into the bearing to guarantee a maintenance-free product. No additional lubrication is necessary.
High-strength bushings
Reliable C67300 Manganese Bronze Bushing for Heavy Use
C67300 Manganese Bronze Bushing: Properties, Applications, and Fabrication
C67300 manganese bronze is a high-strength, high-wear-resistant copper alloy, composed of copper (Cu), zinc (Zn), manganese (Mn), silicon (Si), and lead (Pb), among other elements. This alloy is known for its excellent mechanical properties, corrosion resistance, and durability, making it a popular choice for a wide range of applications, including marine, industrial, and hydraulic systems.
Chemical Composition of C67300 Manganese Bronze
The typical chemical composition of C67300 manganese bronze is as follows:
| Element | Composition (%) |
|---|---|
| Copper (Cu) | 58.00 – 63.00 |
| Lead (Pb) | 0.40 – 3.00 |
| Tin (Sn) | 0.30 |
| Zinc (Zn) | Rem. (balance) |
| Iron (Fe) | 0.50 |
| Nickel (Ni) | 0.25 |
| Aluminum (Al) | 0.25 |
| Manganese (Mn) | 2.00 – 3.50 |
| Silicon (Si) | 0.50 – 1.50 |
(Note: The values for each element may vary slightly depending on the production process and specific alloy variant.)
Physical Properties
C67300 manganese bronze exhibits impressive physical properties that make it ideal for demanding applications. These properties include high strength, resistance to corrosion, and good thermal and electrical conductivity.
| Property | Value (US Customary) | Value (Metric) |
|---|---|---|
| Density | 0.300 lb/in³ at 68 °F | 8.3 g/cm³ at 20 °C |
| Melting Point | 1605 °F | 874 °C |
| Electrical Conductivity | 22% IACS at 68 °F | 0.13 MegaSiemens/cm at 20 °C |
| Thermal Conductivity | 55 Btu/sq ft/ft hr/°F | 95 W/m·K at 20 °C |
| Coefficient of Thermal Expansion | 11 × 10⁻⁶ per °F (68-572 °F) | 19 × 10⁻⁶ per °C (20-300 °C) |
| Modulus of Elasticity | 17,000 ksi | 117,212 MPa |
Mechanical Properties
C67300 manganese bronze offers excellent mechanical properties, including high tensile strength, good yield strength, and substantial elongation. These properties make it ideal for use in load-bearing applications where high strength and durability are required.
| Size Range (Inches) | Tensile Strength (ksi) | Yield Strength (ksi) | Elongation (%) | Rockwell B Hardness |
|---|---|---|---|---|
| Up to 1″ | 65 (448 MPa) | 40 (276 MPa) | 12% | 70 HRB |
| Over 1″ to 3″ | 58 (400 MPa) | 35 (241 MPa) | 15% | 70 HRB |
| Over 3″ | 55 (380 MPa) | 30 (205 MPa) | 18% | 65 HRB |
Key Features and Applications
C67300 manganese bronze has a combination of physical and mechanical properties that make it suitable for a wide range of applications:
- Corrosion Resistance: This alloy offers excellent resistance to corrosion in seawater, steam, and chloride environments, making it ideal for marine applications, such as propeller shafts, pump parts, and valve seats.
- Wear Resistance: C67300 is highly resistant to wear, which makes it an excellent choice for components subjected to friction, such as bushings, bearings, clutch bearings, and sleeve bearings.
- Strength and Durability: The alloy’s high tensile strength and resistance to stress and fatigue make it suitable for heavy-duty applications in the automotive, industrial, and hydraulic sectors.
- Machinability: C67300 has a machinability rating of 70, indicating good machinability compared to other copper alloys. It is best processed using high-speed steel and carbide tools at appropriate cutting speeds.
Typical Applications
- Marine: Propeller shafts, valve seats, and other marine hardware.
- Industrial: Bearings, bushings, clutch bearings, gears, cams, drive shafts, piston heads, and wear plates.
- Hydraulic Systems: Bushings and bearings in hydraulic equipment, where high pressure and wear resistance are essential.
- Fasteners: Lead screw nuts, connecting rods, and other fasteners.
Fabrication and Welding
C67300 manganese bronze can be fabricated using standard machining techniques. However, due to its high hardness, it requires proper tooling and cutting parameters to ensure smooth processing. It can be welded using common welding techniques, including TIG (GTAW), MIG (GMAW), and Stick (SMAW). Care must be taken to control heating and cooling rates to prevent cracking during the welding process.
Conclusion
C67300 manganese bronze bushings offer a unique combination of high strength, wear resistance, and corrosion resistance, making them an ideal choice for applications in demanding industries, including marine, automotive, and industrial sectors. Its excellent machinability and weldability further enhance its versatility, ensuring that it remains a reliable material for various engineering solutions.
