Chemical Composition (%)
| Sb | 15.0~17.0 |
|---|---|
| Sn | 15.0~17.0 |
| Cu | 1.5~2.0 |
| Pb | Balance |
Mechanical & Physical Properties
| Hardness | ≈30 HBW |
|---|---|
| Density | ≈9.4 g/cm³ |
| Max service temperature | <120 ℃ |
Typical Applications
Grade Overview
The most widely applied lead-based Babbitt, used for automotive and tractor crankshaft bearings, rolling-mill reducer bearings, centrifugal-pump bearings and steam-turbine bearings. Antimony and tin form hard phases and copper raises strength further, giving hardness of about 30 HBW, high compressive strength and wear life and service life close to those of the tin-based alloys at a distinctly lower cost, with a maximum service temperature below 120 °C. Its coefficient of friction is higher than that of tin-based ZSnSb11Cu6 and impact toughness is lower. Use it for heavily loaded, high-speed bearings that see no significant shock; confirm whether the duty includes impact loading, control cooling and bond quality during pouring, and observe lead-related environmental and occupational-health requirements. It is usually poured as a thin lining on a steel or bronze shell, and the bond and structure should be checked before the bearing goes into service. Although cheaper than the tin-based alloys, it gives away some toughness, so bearings that see reversing loads or rough handling are better served by a tin-based grade.
Data compiled from current standards; for selection reference only. Ordering is subject to the standard and the mill certificate.