Description
Manganese bronze alloys incorporate minor additions of manganese, iron, and aluminum, and they also include lead to enhance lubrication, prevent seizing, and promote bonding. Similar to aluminum bronzes, manganese bronze alloys effectively blend high tensile strength with outstanding corrosion resistance. Manganese bronze bearings are well-suited for high-speed operations under heavy loads, but it is important to note that they necessitate high shaft hardness and must operate in nonabrasive conditions to maintain their performance.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 56.50 | 60.00 |
| Pb | 1.00 | 1.50 |
| Fe | – | 0.30 |
| Mn | 0.50 | 1.20 |
| Total Others | – | 0.75 |
| Zn | Remainder |
Mechanical Properties According To 6912 FMN1 (As Per Temper HB)
| Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 | 75 | 395 | – | 20 | – | – |
| Hex (A/F) | 3 | 70 | 395 | – | 20 | – | – |
| Square (A/F) | 3 | 60 | 395 | – | 20 | – | – |
| Rectangle (Thickness) | 3 | 50 | 395 | – | 20 | – | – |
| Physical Properties |
Metric |
English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
Fabrication Properties
| Machinability (CuZn39Pb3 = 100 %) | 80.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Equivalent Alloy |
