Investigations on Internal Crack Propagation in High-Niobium Steel Slabs During Cooling and Reheating at ArcelorMittal Dofasco

摘要

ArcelorMittal Dofasco has two steel producing streams as shown in Figure 1. The KOBM stream uses one basic oxygen furnace where the tapped heats are refined at the ladle metallurgy facility (LMF 1) and cast at the No. 1 continuous caster (1CC); some grades are processed at the tank degasser prior to casting. The EAF stream uses a twin shell electric arc furnace where the tapped heats are refined at LMF 2 and cast at 2CC. Several different types of grades are produced between the two streams which include ultra low carbon, low carbon, medium carbon, high carbon, HSLA and AHSS grades for automotive, construction, manufacturing, packaging, distribution, and tubular segments.