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Duplex stainless steel consists of roughly equal proportion of austenite and ferrite phases in their microstructures, exhibiting roughly twice the strength compared to austenitic stainless steel,1) and excellent corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion.2) However, due to the presence of two phases which have very different deformation behaviors,3) duplex stainless steel has inherently poor thermo-plasticity, often leading to the formation of edge cracks in steel plates or surface cracks in steel round bars under hot working conditions.4) Non-metallic inclusions and impurity elements such as sulfur have very negative impact on steel properties, such as ductility, toughness, fatigue strength and corrosion resistance.5,6) Therefore, Al deoxidation instead of Si deoxidation is currently used to achieve very high cleanliness in the production of duplex stainless steel. The chemical composition of refining slag has significant effect on steel cleanliness. Extensive studies have shown Effect of CaF2 on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel

Effect of CaF<sub>2</sub> on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel