A Study of Hot Rolling Oil with Calcium Carbonate for Stainless Steel Process

Abstract

Dispersion-type lubricants formulated with calcium carbonate were experimentally studied to achieve improved hot-rolling characteristics of stainless steel. Two types of lubricants; over-based calcium sulfonate dispersed in oil (fluid type; FT) and calcium carbonate dispersed in grease (semi fluid type; ST) were prepared. ST containing larger particles of calcium carbonate exhibited a better lubricity in rolling of steel than FT. Although the particle size of calcium carbonate powder is about 1 μm, the dispersed state was stable in ST. Following the rolling tests, the surfaces of tribo-films were analyzed using XPS and TOF-SIMS. A lubrication model with calcium carbonate particles was proposed based on the surface analysis.