A New Method for the Simulation of Sticking Occurrence in Ferritic Stainless Steels during Hot Strip Rolling

摘要

Fenitic stainless steels (FSSs) often ran into the trouble caused by sticking defects during hot rolling, forming suiface defects on strip products and scoring on roll surfaces. However, the information about sticking behavior of FSSs is limited due to the lack of effective methods for simulation hot strip rolling process. A new methodology to simulate the sticking occurrence during hot rolling has been developed, which is performed with a thermal-mechanical simulator by using the specimens with grooves in wnicn me grooved sun aces were in coniaci wim me Hammers sun aces only during compression. This method wnicn involved compression deformation was very close to the actual hot strip rolling condition and the sticking progressed with compression proceeding could be observed easily. High-temperature oxidation test showed that the oxidation resistance of FSSs increased with increasing Cr content and decreasing C and N contents. Specimens with different thickness of scales were used in the new simulation test and it was suggested that FSSs with less oxide on surfaces were more sensitive to sticking. Therefore the high Cr and high purification FSSs which preserve excellent oxidation resistance would face more severe sticking phenomenon than other FSSs during hot strip rolling. And that the sticking particles nucleated at the scratches of the hammers' surfaces to serve as the sticking growth sites was observed.