EFFECTS OF EXTREME-PRESSURE ADDITIVES ON LUBRICITY AND ANTI-SEIZURE PROPERTY OF LUBRICANTS

The effects on lubricity and anti-seizure property of lubricants accor ding to base oils and EP additives of sulfur and phosphorous types in cold rolling were evaluated by a laboratory scale rolling mill, where the contact conditions between work roll and strip are very close to a n actual cold rolling mill. The following experimental results were ob tained. Sulfur type EP additive improves lubricity better than phospho rous type. In contrast, phosphorous type EP additive improves anti-sei zure property better than sulfur type. And anti-seizure property is no t affected by the kinds of base oil, but improved by the kinds and the amount of EP additives. Therefore, the amount of EP additives of sulf ur and phosphorous types must be controlled in order to improve both l ubricity and anti-seizure property. In addition, the existence of EP f ilm was verified from the results of EDS analysis of the Falex test pi ns.