THERMODYNAMIC ANALYSIS FOR DEVELOPING STRATEGIES FOR THE PRODUCTION OF LOW PHOSPHOROUS STEEL GRADES

摘要

With continuous deterioration in the quality of raw materials, there is an increasing focus on improving the steelmaking processes to enhance final product quality. The present study was performed to analyse the major thermodynamic aspects associated with BOF steelmaking with particular emphasis on De-Phospohorization, thus enabling to produce low phosphorous steel grades. In the present study data from two steel plants (Plant A and Plant B) were collected and Multiple Linear Regression (MLR) was employed to develop an equation for calculating phosphorous partition in Steel plants A and B. This thermodynamic evaluation allows development of useful strategies for producing low phosphorous steels, covering a wide range of operating conditions - low and high phosphorous input loads, low and high MgO level in slag, low and high MnO levels in slag, low and high tapping temperatures etc. Finally, some technology enablers required for producing low phosphorous steels have been discussed.