Predicting Heating Sliver in Duplex Stainless Steels Manufacturing through Rashomon Sets

A particular challenge while designing duplex steel is the minimization of surface defects such as heating slivers, since these defects may significantly increase production costs as they remain mostly undetected, being observed only during the final product inspection. Heating slivers may be originated in different stages of the steelmaking process, and to identify their formation in duplex stainless steel, we propose a feature decomposition approach that resulted in hundreds of thousands of predictive models learned from defective and non-defective duplex plates, thus offering diverse models regarding their incidence. We grouped these models based on their competing explanations, as a means to isolate the different possible root causes for heating sliver. Finally, we search for optimal models in the graphs derived from intra-cluster feature relationships.