C67300
C67300 manganese bronze is a robust alloy known for its exceptional strength and favorable bearing properties. This alloy retains a high level of impact resistance while also offering excellent machinability, making it particularly well-suited for a range of applications. These include but are not limited to clutch bearings, shaft bushings, sleeve bearings, thrust bearings, pump components, drive shafts, bearing pins, wear plates, gears, and cams.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 58.00 | 63.00 |
| Pb | 0.40 | 3.00 |
| Si | 0.50 | 1.50 |
| Mn | 2.00 | 3.50 |
| Sn | – | 0.30 |
| Fe | – | 0.50 |
| Ni | – | 0.25 |
| Al | – | 0.25 |
| Total Others | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO C67300 (AS PER TEMPER HO2)
| Range (Inch) | From | To | UTS Min (Ksi) | PS Min (Ksi) | ELo Min (Ksi) | Hardness Min (HRB) | Hardness Max |
| Round (Dia) | 0.059 | 1.000 | 65 | 40 | 12 | 70 | – |
| 1.000 | 2.953 | 58 | 35 | 15 | 70 | – | |
| Hex (A/F) | 0.118 | 1.000 | 65 | 40 | 12 | 70 | – |
| 1.000 | 2.756 | 58 | 35 | 15 | 70 | – | |
| Square (A/F) | 0.118 | 2.362 | 60 | 30 | 20 | 70 | – |
| Rectangle (Thickness) | 0.118 | 1.968 | 60 | 30 | 20 | 70 | – |
| Range (mm) | From | To | UTS Min (Mpa) | PS Min (Mpa) | ELo Min (%) | Hardness Min (HRB) | Hardness Max |
| Round (Dia) | 1.5 | 25 | 450 | 275 | 12 | 70 | – |
| 25 | 75 | 400 | 240 | 15 | 70 | – | |
| Hex (A/F) | 3 | 25 | 450 | 275 | 12 | 70 | – |
| 25 | 70 | 400 | 240 | 15 | 70 | – | |
| Square (A/F) | 3 | 60 | 415 | 205 | 20 | 70 | – |
| Rectangle (Thickness) | 3 | 50 | 415 | 205 | 20 | 70 | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1605 |
| Density lb/cu in. at 68°F | 0.3 |
| Specific Gravity | 8.3 |
| Electrical Conductivity % IACS at 68°F | 22 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 55 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11 |
| Modulus of Elasticity in Tension ksi | 17000 |
| FABRICATION PROPERTIES | |
| Technique | Suitability |
| Machinability Rating | 70 |
