Control of refining slag system for high silicon steel under different deoxidation processes
In response to the difficulty of precise control of refined slag in the production of high silicon steel using the"converter → RH refining → continuous casting"process flow,the reasonable control range of refined slag system under two different deoxidation processes is calculated using FactSage 7.2 commercial thermodynamic calculation software.When using the A deoxidation process i.e.,alumi-num deoxidation silicon alloying process,the reasonable refining slag control range is between 53%to 55%for the calcium oxide content,15%to 18%for the silicon dioxide content,25%to 30%for the aluminum oxide content,3%to 5%for the magnesium oxide content,and 3%to 5%alkalinity.When using the B deoxidation process i.e.,silicon deoxidation aluminum alloying process,the reason-able range of the main components of the refining slag system is between 53%and 56%for the cal-cium oxide content,12%and 17%for the silicon dioxide content,25%and 30%for the aluminum ox-ide content,3%and 5%for the magnesium oxide content,and 3%and 4.5%for the alkalinity.Two industrial methods are used to analyze the adsorption capacity of different deoxidation process refining slag systems,and the results show that the number and size distribution of inclusions under the B de-oxidation process are better than those under the A deoxidation process.
high silicon steelslag systeminclusion adsorptiondeoxygenation processoxygen and nitrogen content
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