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To study the lubricatioll mechanism and to find a preferable composition oj lubricantJor hot rolling, low carbon steel slJecimens IlreparedJrorn a hot strip were rolled with various lubricants in a high speed test mill. The Jactors investigated were, firstly, the effects oj viscosity and chemical structure oj mineral oil on lubricity, secondi)' the roles oj chemical IJrolJerties oj tallow ill lubricity with reslJect to those oj mineral oils, alld thirdly the effect oj carbon chaill length alld structure oj Jatl.)' acid as additives on lubricity. The effect oj rollillg temperature was also examined. M ineral oils showed the hydrod)"wmic lubricating effects, whereas tallow alld Jatty acids acted as all oililless agent. OJ the mineral oils added with tallow to various concentratiolls, the lubricating effect oj 20% additioll oj tallow to paraffinic oil oj a viscosity about 30 cst at 37.8°G was equivalellt to those oj tallow. IVlulI added withJatty acid, the lubricatillg effect oj 10° ° additioll oj fatty acid was equivalent to that oj Jatl.)' acid. T he lubricatillg effects oj myristic acid alld stearic acid were better than the Illlsaturated acids, oleinic acid and lilloleic acid, or the sa tura ted acids but oj a shorter carboll chaill . The good lubricity oj the paraffinic oil contailling 20° ° stearic acid was kept unharmed at temperatllres ranging from 900 to 1 OOOT.

Effect of Lubricant Composition on Lubricating Behavior in Hot Rolling of Low Carbon Steel