Abstract
Industrial-scale tests were carried out to produce low phosphorus stainless steels by AOD process using Li2CO3 CaO-CaF2 FeO flux.It has become possible to manufacture low phosphorus stainless steels below 100ppm steadily from molten pig iron containing about 18%, Cr and 0.025% P, by introducing a desiliconization and carburization step and twice dephosphorization steps into a well-established ADD process. It required about 10min to carburize from 3.5 to above 5.0% in AOD vessel and the oxidation of silicon occurred simultaneously during the carburization operation with blowing oxygen. By treating molten pig iron containing chromium for SUS304 using about 65kg/t of the flux, 42-67% of the degree of dephosphorization was obtained stably per treatment for 8min in most cases.The phenomenon was observed that the apparent oxidation rate of phosphorus rather increased slightly, contrary to the decrease in that of chromium with increasing the carbon content of the hot metal before the dephosphorization treatment. The concentration of carbon also had a remarkable effect on the content of Cr2O3 in the slag after the treatment.
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