Experimental Study on Sliding bearing of Sink Roll in Galvanizing Line

Abstract

Hot dip galvanizing can effectively prevent the corrosion of steel. With the increasing demand of industry for steel strip, higher requirements are put forward for stable and continuous operation of submerged roller bearings in hot dip galvanizing line. The existing sliding bearings for sink roll of galvanizing line mainly depend on imports, and their service life is about two weeks. Two weeks later, the sliding bearing failed, so it is necessary to stop the line and replace the new bearing, wasting a lot of material cost and time cost. In this paper, zinc liquid corrosion test, high temperature pin-and-disc dry friction test and corrosion wear test were carried out on the materials of sliding bearing pair of submerged roller, mainly alumina ceramic bushing and three kinds of metal sleeves (alloy A, alloy B and 316L stainless steel) under simulated actual working conditions. The status of corrosion and wear in bearing failure was compared and analyzed, and the hydrodynamic lubrication effect formed by zinc liquid under test conditions was considered, and the main failure mechanism was comprehensively analyzed.