CDA675 (Manganese Bronze A)
CDA675 Manganese Bronze A is a copper-zinc alloy with iron, tin and manganese additions. It is suited to hot forging, hot heading and upsetting, with typical use in automotive, fastener, industrial and marine components.
- Description
- Product Specifications
Description
CDA675 Manganese Bronze A is designed for applications that require strength, hot forming capability and reliable component performance. It is commonly supplied as bar, rod, shapes, forgings, bolts, nuts, screws and studs.
This alloy offers excellent soldering and brazing suitability, good oxyacetylene welding and butt welding performance, and excellent hot forming capacity. Typical applications include clutch disks, shafting, pump rods, bolts, valve bodies, balls, valve stems, bushings, aircraft parts and marine hardware.
Key Features:
- Manganese Bronze A alloy
- Excellent hot forming capacity
- Forgibility rating of 80
- Machinability rating of 30
- Excellent soldering and brazing suitability
- Good oxyacetylene welding, spot welding and butt welding suitability
- Suitable for hot forging, pressing, hot heading and upsetting
- Commonly used for valve components, bushings, shafting, pump rods and marine hardware
| Element | Composition | Nominal |
|---|---|---|
| Copper (Cu) | 57.0-60.0% | 58.5% |
| Iron (Fe) | 0.8-2.0% | 1.4% |
| Tin (Sn) | 0.50-1.5% | 1.0% |
| Manganese (Mn) | 0.05-0.50% | 0.10% |
| Aluminium (Al) | 0.25% max | – |
| Lead (Pb) | 0.20% max | – |
| Zinc (Zn) | Remainder | 39.0% |
| Cu + Named Elements | 99.5% min | – |
| Form | Temper | Section Size | Tensile Strength | Yield Strength | Elongation | Shear Strength |
|---|---|---|---|---|---|---|
| Rod | H01 | 51 mm | 496 MPa | 290 MPa | 27% | 303 MPa |
| Rod | O60 | 25.4 mm | 448 MPa | 207 MPa | 33% | 290 MPa |
| Rod | H02 | 25.4 mm | 579 MPa | 414 MPa | 19% | 331 MPa |
| Rod | H01 | 25.4 mm | 531 MPa | 310 MPa | 23% | 324 MPa |
| Melting Point – Liquidus | 888°C |
|---|---|
| Melting Point – Solidus | 866°C |
| Density | 8.36 g/cm³ at 20°C |
| Specific Gravity | 8.36 |
| Electrical Resistivity | 7.18 microhm-cm at 20°C |
| Electrical Conductivity | 0.14 MegaSiemens/cm at 20°C |
| Thermal Conductivity | 105.6 W/m.K at 20°C |
| Coefficient of Thermal Expansion | 21.2 x 10⁻⁶ per °C, 20-300°C |
| Specific Heat Capacity | 377.1 J/kg.K at 293 K |
| Modulus of Elasticity | 103400 MPa |
| Modulus of Rigidity | 38610 MPa |
| Soldering | Excellent |
|---|---|
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Spot Weld | Good |
| Seam Weld | Fair |
| Butt Weld | Good |
| Cold Working | Poor |
| Hot Forming | Excellent |
| Forgeability Rating | 80 |
| Machinability Rating | 30 |
| Common Fabrication Processes | Hot forging and pressing, hot heading and upsetting |
| Common Forms | Bar, rod, shapes, forgings, bolts, nuts, screws and studs |
