Study of the boundary friction of high-strength steel during the cold rolling

Abstract

Skidding, which causes strip-surface defects between rolls and strips, is more likely to occur during the cold rolling of high-strength steel (HSS) than during that of ordinary steel. This occurs when the friction coefficient between them is low. However, the cause of the low friction coefficient during the cold rolling of HSS necessitates further investigation. This study conducted rolling tests using a synthetic hydrocarbon with oleic acid and methyl oleate as friction modifiers to compare the boundary friction coefficients of HSS and ordinary steel. Consequently, the friction coefficient of the HSS was lower than that of ordinary steel, regardless of the type of friction modifier applied. Furthermore, neutron reflectometry revealed that thicker adsorption films were formed on the HSS than on ordinary steel. Moreover, the thicker friction modifier film formation on HSS than on ordinary steel probably resulted in a lower friction coefficient during the cold rolling of HSS.