Equilibrium between liquid iron and FetO‐containing solid solution

Oxidation and reduction are utilized in the refining process of iron and steel. Therefore, the most important thermodynamic property is the activity of Fe t O in slag and especially in refractories, which contact with liquid iron and steel. It is well known that refractories easily form solid solutions with Fe t O, so that molten iron and steel would react with Fe t O in the refractories, non‐metallic inclusions and slag coexisting in the iron and steel production process. In the present work, the reaction of molten steel with the solid oxide phase will be discussed based on the activity of the constituents in MnO‐Fe t O and Fe t O.Cr 2 O 3 ‐Fe t O solid solutions by way of examples of Fe t O‐containing solid solution.