“…However, it is often readily possible to remove an external iron oxide scale layer in silicon-free steels, formed during casting, reheating, and hot rolling. [7] If the internal oxidation underneath the oxide layer is too heavy, [8,9] this can cause problems during downstream processing (e.g., crevice corrosion in pickling solutions [10] or uncoated spots during galvanizing). By designing the gas composition in a reheat furnace in such a way that an outer scale layer may form, the internal oxide formation could be reduced.…”