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Abstract

This project is aimed at the improvement of quality and process conditions of hot-rolled strips through roll gap lubrication. Models for determining the laws of deformation of iron oxide scales for different rolling conditions (temperature, nature of scale, presence of lubricant) have been developed aiming at the improvement of mill preset. The effect of lubricant on the environment has also been investigated by studying polycyclic aromatic hydrocarbons (PAH) formation: results from pilot and industrial trials showed that no PAH is formed from lubricants as long as water and air are present. Laboratory lubricity tests have been carried out in different conditions to evaluate tribological properties of a range of hot-rolling lubricants, permitting a better pre-selection of the lubricant according to mill characteristics. Dedicated pilot mill tests carried out at different temperatures and different reduction resulted in the possibility of determining the friction coefficient decrease due to lubrication; these tests also demonstrated that the effect of lubricant on the hot-rolling forces is constant when the thickness reduction is more than 20 % and that there is a slight dependence on the rolling temperature. The effect of lubrication on strip profile and flatness on a wide range of steel grades has been assessed, leading to new operating practices. The work roll wear decrease due to lubrication has been determined as a function of the different rolled steel grades and roll material. Finally, inspections at processing lines revealed no significant effect of lubricant on the surface quality for the different steel grades.

Additional information

Authors: SANFILIPPO F, CSM, Rome (IT);LANTERI V, IRSID, Maizières-lès-Metz (FR);GEFFRAYE F, IRSID, Maizières-lès-Metz (FR);ZINT D, IRSID, Maizières-lès-Metz (FR);RAULF M, TKS, Dortmund (DE);LEVONMAA R, Avesta Polarit, Tornio (FI)
Bibliographic Reference: EUR 20208 EN (2002), pp.124. Euro: 19.00
Availability: EUR-OP reference: KI-NA-20208-EN-S Available from EUR-OP sales agents. URL: http://eur-op.eu
ISBN: ISBN: 92-828-6730-7
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