Effect of Carbon Content on Solidification and Microstructure of Martensitic Stainless Steel in Steel Mill Rolls Weld Cladding

Oxidation, Scaling, Thermal fatigue and Abrasive wear all contribute towards deterioration of the rolls surface. Submerged arc welding process with tubular flux-cored wires (FIFO process) is more applicable in roll cladding and hardfacing. In this study, 4 type of AISI420 martensitic stainless steel flux-cored wires with various carbon content produced by wire forming process. An one meter length carbon steel roll chosen as base metal for submerged arc cladding. Finally, the cladded roll cooled slowly below thermal insulation. Because of proper preheating temperature selection, Nondestructive test results showed that no cracking occurred on the roll surface. Microstructural investigation of samples cleared an Austenitic-martensitic microstructure in the clad region that has high hardness and good wear resistance.