Chemical Composition (%)
| Sb | 10.0~12.0 |
|---|---|
| Cu | 5.5~6.5 |
| Sn | Balance |
Mechanical & Physical Properties
| Hardness | ≈27 HBW |
|---|---|
| Density | ≈7.3 g/cm³ |
| Max service temperature | ≤110 ℃ |
| Solidus / liquidus | 240 ℃ / 370 ℃ |
Typical Applications
Grade Overview
The most classic tin-based Babbitt metal, used for steam-turbine bearings, compressor bearings, internal-combustion engine bearings and machine-tool spindle bearings. The structure is a soft matrix carrying hard SnSb and Cu6Sn5 particles, which gives good compressive strength, toughness and thermal conductivity together with excellent anti-friction behaviour, seizure resistance and corrosion resistance; hardness is about 27 HBW and the load capacity is the highest of the tin-based alloys, though service temperature is generally limited to 110 °C. Above that, hardness and strength fall away rapidly, and tin is expensive. Specify it for important high-speed, heavy-duty bearings; control cooling during pouring to obtain a uniform, fine structure, ensure sound bonding to the steel backing, and keep the running temperature firmly within limits. Casting practice is critical: the melt must be kept clean, the backing tinned and preheated, and the layer cooled at a controlled rate so the hard particles are evenly distributed. Thin, uniform linings with adequate oil supply give the best service life, and the alloy should not be run near its temperature limit.
Data compiled from current standards; for selection reference only. Ordering is subject to the standard and the mill certificate.