Hot rolling lubrication at SSAB Tunnplat 6-Stand hot strip mill in Borlange, Sweden

摘要

In hot rolling, friction is necessary to achieve safe bit conditions, since the frictional forces pull the strip into the roll gap. It is clear that by lubricating the rolls, the roll force and thus the power requirements and energy consumption can be reduced. In this paper, recent encouraging experiments at SSAB Tnnplat on lubricating a hot strip mill is described. Trials were made by a direct spray of an oil and water dispersion at the work roll surface on the entry side. Together with emulsifiers and polar additives mixed into the lubricant, different oil concentrations were tested. Lubricants reduced significantly the roll force, and values for different lubricant compositions are given. In the evaluation of the results, attention must be paid to the rolling geometry and the oxidation of the rolls.