A study of the coefficient of friction during hot rolling of a ferritic stainless steel

The objective is to examine the conditions under which the layer of scale on the surface of 430 stainless steel strips during hot rolling is capable of reducing the coefficient of friction. The independent parameters are the thickness of the layer of scale, the temperature, the speed, the reduction and the origin of the sample, whether slab or strip. The roll forces and the coefficients of friction depend on the thickness of the scale layer in a significant manner. The rolling speed, the temperature and the reduction also affect both variables. The forces and the coefficients drop as the scale thickness increases at 900 ° and 1000 °C. The opposite is observed at 1100°C. Both parameters decrease as the temperature and the roll velocity increase. In the speed range of 1 m/s and at temperatures less than 1100°C increasing scale thickness appears to reduce the frictional resistance. At lower speeds and higher temperatures the opposite phenomenon has been observed.