Impurities Control in Producing Advanced High-Strength Steels (AHSS): Literature Review of Effects of MnO Concentration in Slag on the Dephosphorization Process
(Room 209C)
08 May 17
11:00 AM
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11:30 AM
Tracks:
Steelmaking Fundamentals
Advanced high-strength steels (AHSS) generally contain much more manganese (2–20%) compared with other steel grades. Higher MnO content during steelmaking is expected in slag as higher-manganese steels enter the scrap pool. Effects of MnO content in slag on dephosphorization were evaluated based on data collected from previous work. It was found that the phosphorus distribution ratio decreases slightly with an increase of MnO content for equilibrium conditions, everything else being equal. For practical steelmaking operations, the phosphorus reaction deviates from equilibrium, and no obvious effect of MnO content was observed. Additionally, a mass balance calculation showed that a significant amount of phosphorus could be introduced by ferroalloy additions, which could not be easily removed in the following steelmaking process.