Abstract: During stainless steel strip cold rolling, the roll surface roughness has important effect on setting up of process parameters and control of strip surface quality. In the laboratory, the lubrication experimental research on the effects on roll surface roughness of SUS430 stainless steel strip in cold rolling is carried out. The effects of roll surface roughness are investigated by using Quanta 600 SEM (Scanning electron microscopy), Zeiss-LSM 700 optical microscope and surface rough meter, including the root mean square (RMS) roughness of strip, the micro-defect rate of strip, the roll force and the oil film thickness on strip surface. The results show that with roll roughness 0.7 μm, it is obvious to improve the strip surface quality, at the low concentration of emulsion, and while the concentration of emulsion arising, the RMS roughness of strip is increased with roll roughness increasing. The strip micro-defect rate can be reduced through decreasing roll roughness. With roll roughness increasing, the important trend is found in specimens that the oil film thickness on strip surface increases first, and then decreases, at the low concentration of emulsion, and while the concentration of emulsion arising, the oil film thickness will be maximum, with roll roughness 0.7 μm. The roll force increases gradually with roll roughness increasing, at the high concentration of emulsion, and while the concentration of emulsion dropping, the roll force will be low with roll roughness 0.8 μm.

Key words: Cold rolling, Oil film, Roll force, Roll surface roughness, Stainless steel