CDA673 Manganese Bronze
CDA673 Manganese Bronze is a copper-zinc alloy with manganese, silicon and lead additions. It is suited to hot forming, hot pressing and machining for high-strength industrial and marine components.
- Description
- Product Specifications
Description
CDA673 Manganese Bronze is designed for applications that need strength, wear resistance and dependable machining performance. It is commonly supplied as bar, rod, forgings and shapes, with H50 listed as a common temper for bar and rod.
This alloy is used across industrial, marine and fastener applications, including clutch bearings, shaft bushings, propeller shafts, sleeve bearings, pump parts, seal rings, valve seats, gears, cams and lead screw nuts.
Key Features:
- Manganese bronze alloy
- Copper-zinc base with manganese and silicon additions
- Machinability rating of 70
- Suitable for hot forming, hot pressing and machining
- Commonly supplied as bar, rod, forgings and shapes
- Used for bearings, bushings, gears, cams and pump parts
- Suitable for marine hardware and valve seats
- No casting characteristics listed for this alloy
| Element | Composition | Nominal |
|---|---|---|
| Copper (Cu) | 58.0-63.0% | 60.5% |
| Lead (Pb) | 0.40-3.0% | 1.7% |
| Manganese (Mn) | 2.0-3.5% | 2.7% |
| Silicon (Si) | 0.50-1.5% | 1.0% |
| Aluminium (Al) | 0.25% max | – |
| Iron (Fe) | 0.50% max | – |
| Nickel (Ni) | 0.25% max | – |
| Tin (Sn) | 0.30% max | – |
| Zinc (Zn) | Remainder | 34.1% |
| Cu + Named Elements | 99.5% min | – |
| Form | Temper | Section Size | Tensile Strength | Yield Strength | Elongation | Rockwell Hardness |
|---|---|---|---|---|---|---|
| Bar | H50 | <25.4 mm | 448 MPa | 276 MPa | 11% | 80 B |
| Melting Point – Liquidus | 874°C |
|---|---|
| Density | 8.3 g/cm³ at 20°C |
| Specific Gravity | 8.3 |
| Electrical Conductivity | 0.13 MegaSiemens/cm at 20°C |
| Thermal Conductivity | 95.0 W/m.K at 20°C |
| Coefficient of Thermal Expansion | 19.0 x 10⁻⁶ per °C, 20-300°C |
| Modulus of Elasticity | 117200 MPa |
| Machinability Rating | 70 |
| Common Fabrication Processes | Hot forming, hot pressing and machining |
| Common Temper Options | Bar H50, forgings T and rod H50 |
| Common Forms | Bar, forgings, rod and shapes |
| Applicable Specifications | SAE J461 and SAE J463 |
| Typical Uses | Fasteners, lead screw nuts, clutch bearings, shaft bushings, propeller shafts, sleeve bearings, thrust bearings, pump parts, seal rings, spindles, idler pins, drive shafts, piston heads, bearings, bushings, pins, wear plates, gears, cams, marine hardware, valve seats and connecting rods |
