Roughness and Glossiness of SUS430 Stainless Steel in Cold Rolling

In order to improve surface glossiness of stainless steel strips in cold rolling, an experiment on roughness and glossiness of SUS 430 ferrite stainless steel was carried out in laboratory. The relation between roughness and glossiness with reduction in height, roll surface roughness, emulsion parameters was investigated. Roughness and micro defects were analyzed. The effects of micro defects on lubrication oil in deformation zone and reduction were discussed. With the increasing of reduction ratio strip surface roughness Ra(s), Rp(s) and Rv(s) were decreasing along rolling and width direction, the drop value in rolling direction was faster than that in width direction. The roughness and glossiness were obtained under emulsion concentration Ce = 3% and 6%, temperature Te = 55 and 63 °C, roll surface roughness Ra(r) = 0.5, 0.7 and 1.0 μm. The glossiness was declined rapidly when the micro defects ratio was above 23%. When lubrication oil in micro pit of deformation zone was decreased, micro defects were decreased, and glossiness value on the surface of strip was increased.