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The CAS-OB (Composition Adjustment by Sealed argon bubbling – Oxygen Blowing) is a unit process designed for controlling the steel composition and temperature in secondary metallurgy. The process can be divided into heat-up, alloying and reduction of slag. The objective of the heat-up stage is to increase the temperature of the steel bath by chemical heating with aluminium particles. Typically, heating rates up to 10 °C/min can be obtained in industrial practice. The reduction stage aims to improve the yield of the alloying elements.


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