Demag Continous Caster (Billet)Central Lubrication

As a supplier of automated lubrication systems, we have been retrofitting a lot of steel mill automated lube systems from grease to an Air/Oil technology. This has provided significantly cooler running bearings. The grease choice can only go so far to the cooling effects based on the environment. In this application using air to transport the oil down the lines provides the bearing with a constant, very light spray of oil, depending on the speed, can reduce viscous drag and heat in itself. The added benefit of the air is that it will also provide a very large cooling effect in the bearing removing heat that is being applied by the hot steel. The other benefit is that is provides a slight pressurization of the bearing, preventing contamination from entering seals. If you want more info on this and application references please hit me off line.

Deanm@autolube.ca

There is a difference in the two thickeners, Calcium Sulfonate thickner will fuse and lock up if the thickner is severly overheated, in high temp areas Calcium Sulfonate thickners should be auto greased but Calcium Sulfonate thickner is better for "normal Temp" wet applications.
Polyurea thickner does not fuse and "lock" up when overheated and when regreasing with polyurea greases the grease will tend to pick up heat dried thickner and recombine so hot applications are far better off on polyurea thickners.
but,
if the temp is really 800-900°C then no hydrocarbon based lubricant will be satisfactory, air oil mist lubrication will handle far higher temps due to reasons set out by Dean, dry lubes like HBN, (Hexangonal Boron Nitrite) will often work well depending upon load.
Regards
Rob S

Not agree with polyurea for this situation
Try to use PTFE grease, or any other lubricant which having clean burn characteristic.

Hi Nurudin, I'm assuming the rolling element bearing is not running at 800°C as the rolling elements wuold be too soft to run and if the bearing is running above 800°C I agree the lubricant needs to be a lubricant that gasses off at high temperatures, Polyfluoroether best, (probably can't use PTFE as will fuse at about 450-500°C,)
Regards
Rob S