6912 FMnB
6912 FMnB Spec SheetManganese bronze contains small additions of manganese, iron, and aluminum, plus lead for lubricity, anti-seizing, and bonding. Like the aluminum bronzes, they combine high strength with excellent corrosion resistance. Manganese bronze bearings can operate at high speeds under heavy loads, but require high shaft hardness and nonabrasive operating conditions.
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 FHTB2 (as per temper HB)
| Range (mm) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| 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 | |
|---|---|
| Density (English) | 0.303 lb/in3 |
| CTE, linear (English) | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity (English) | 0.0908 BTU/lb-˚F |
| Thermal Conductivity (English) | 784 BTU-in/hr-ft²-˚F |
| Melting Point (English) | 1620 – 1650 ˚F |
| Solidus (English) | 1620 ˚F |
| Liquidus (English) | 1650 ˚F |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 80% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Equivalent Alloy |
Typical Uses
