Article

Metallurgical and Materials Transactions B

, Volume 43, Issue 3, pp 554-561

Open Access This content is freely available online to anyone, anywhere at any time.

Investigations of the Dephosphorization of Liquid Iron Solution Containing Chromium and Nickel

  • Miroslaw KarbowniczekAffiliated withDepartment of Metal Engineering and Industrial Computer Science, AGH University of Science and Technology Email author 
  • , Elzbieta Kawecka-CebulaAffiliated withDepartment of Metal Engineering and Industrial Computer Science, AGH University of Science and Technology
  • , Jan ReichelAffiliated withSMS Siemag AG

Abstract

The most up-to-date trends in stainless steel production—aiming at the reduction of production costs—consist of the substitution of steel scrap by hot metal, coming from the reduction of iron-chromium ores. This process requires a more extensive dephosphorization. The dephosphorization process, when applied to chromium steels, requires slag with high dephosphorization properties, as either chromium or chromium oxide entering the slag decreases distinctly the efficiency of the process. The results of laboratory investigations on the dephosphorization of liquid iron solutions containing chromium and nickel are presented. In particular, the study was focused on the selection of the optimal slag composition and the way the slag should be added. The slags based on calcium and fluorite with cryolite additions were considered. It was shown that the variables with the greatest impact on the dephosphorization process include chromium and nickel levels, temperature, and slag basicity. A statistical analysis was performed and regression equations were set. The results may be of use for the design of new methods of production of high-chromium steels.