9th ECCC European Continuous Casting Conference – ECCC 2017

When continuous casting rolls are in operation, the load pressure and temperature changes from the top segment at the point of continuous contact to the horizontal zone. During this process, rolls must withstand the following phenomena:  Elevated temperature  Intensive water spray cooling  High slab contact pressure  Fatigue due to cyclic thermal and mechanical stresses  Adhesive and abrasive wear  Corrosive environments Roll surfaces deteriorate under these service conditions, so weld-overlaying is the best option to extend their service life. This weld procedure can be applied as a preventive or as a remedial measure. This article gives an explanation as to why martensitic stainless steels (SS) are commonly used to weld-overlay rolls. It will also be shown that different overlay chemical compositions can be used according to the roller location, i.e. depending on the segment of the continuous casting machine. The influence of each chemical element in overlay performance will also be reviewed. The article concludes with a detailed review of the welding processes and the final heat treatment.