Synopsis : Thermodynamic consideration is an effective procedure for calculation of inclusion composition prediction. In general, Henrian standard state is used, and the activity coefficients of the constituents are represented by Wagner's formalism in thermodynamic calculations. This formalism is commonly used in low alloy steel, and this is not recommended for high alloy steel. High alloy steel is detailed thermodynamically using the Raoultian standard state, and the activity coefficients of the constituents are converted by Miki and Hino's formalism in this study. The equilibrium relation between Al 2 O 3 , MgO, spinel (MgO · Al 2 O 3 ) and dissolved Al, Mg and O in Fe-40mass%Ni-5mass%Cr alloy (Spacer Frame for fluorescent display) were discussed. Plant data of Fe-40mass%Ni-5mass%Cr alloy were compared thermodynamically with the calculated results. It was found that Wagner's formalism can't be useful for inclusion composition prediction of Fe-40mass%Ni-5mass%Cr alloy, Miki and Hino's formalism should be utilized for high alloy steel.
Iron nugget making process by rapid heating reduction of powdery iron ore and pulverized coal mixture is regarded as one of the novel ironmaking processes. Iron carburization during smelting reduction is especially important reaction step from the viewpoint of saving energy in this process. If the rate and efficiency of carburization reaction are increased, energy consumption of the process will be reduced to large extent. The purpose of this study is to clarify the carburization degree of iron nugget during smelting reduction of the mixture. The sample was prepared from graphite, electrolytic iron powder and synthetic slag containing iron oxide to simulate iron carburization phenomena during smelting reduction of the mixture in the present work. The sample was quenched immediately after the mixture changed into nugget shape in a rapid heating process. Laser microscope combined with infrared image furnace was used for sample heating and observation of carburization phenomena, and carbon content in the nugget was chemically analyzed after quenching. From above-mentioned investigations, it was revealed that the occurrence of carburization during smelting reduction in the sample mixture is advantageous to obtain higher carbon contain iron nugget.
Synopsis : Amount of steelmaking slag emission is increasing due to strong demand for high quality steel. Development of slag and process that can remove impurity at high efficiency is required to decrease slag discharge volume. Phosphorus is a typical impurity in steel and it can be removed by slag with high CaO and Fe t O activity. CaO-Fe t O-P 2 O 5 system has two liquid phase region that has CaO and Fe t O high activity. It was confirmed that CaO-MgO-Fe t O-P 2 O 5 two liquid phase slag can remove phosphorus at high efficient in the previous work. The phase relation and ability of phosphorus removal by CaO-Al 2 O 3 -Fe t O-P 2 O 5 system was investigated in the present work.
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