Study of a fuse-polymerised inorganic glassy compound as a hot rolling lubricant

Abstract

This study had investigated the main degradation mechanism of a roll in hot rolling process, to reduce the wear and oxidation, a type of low-melting glass fabricated by the fuse-polymerisation method was tested as a hot metal forming lubricant by a ball-on-disc tribometer at high temperature. The results revealed that the roll degrades mainly due to the cracks initiated at the interface of carbides/matrix on the roll surface, then propagate along the interface, and being sheared off when the cracks confluence in the subsurface. The high-speed steel (HSS) starts to be oxidised at 500°C, and grows heavily with increasing temperature. The recommended lubricant presented a desired lubrication behaviour for hot rolling process that generating a higher friction coefficient at low temperature and a lower one at high temperature. The friction coefficient, wear rate, and oxidation of HSS roll was reduced materially, which meets the requirements of hot rolling lubricant well.