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Browsing by Subject "oxidation of phosphorus"

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    Item type:Article, Access status: Open Access ,
    Oxygen-blowing remelts of low-alloyed Cr-Mn-Ni-Mo steels with the variable oxidation rate of carbon, chromium and phosphorus
    (2005) Sobula, Sebastian; Głownia, Jan
    Low-alloy Cr-Mn-Ni-Mo cast steels and high-alloy manganese cast steels are freąuently use as castings in such areas as minerał industry and power industry. Melting technology of these steels is often based on the use the return-scrap in charge, because the prices of nickel and molybdenum are very high. Basic electric arc furnaces were used in the oxidation re-melting of high manganese and Iow alloyed Cr-Mn-Ni-Mo steel scraps. The measuring of bath temperaturę and chemical composition were realized for control of C, P and Cr oxidation rates. This article shows effect of two methods of carbon boil, used in re-melting technology: first is carbon oxydation by iron ore and second is oxygen-blo-wing. The results of these measurements showed that at the oxygen blowing under the pressure of ca 0,6-K),8 MPa and oxygen capacity of 0,37-^0,60 N-m /(min-Mg), the average value of decarburisation ratę is 1,03-^2,08% C/h, according the temperaturę of the bath. In the same condition of oxidation, the dephosphorisation ratę in Cr-Mn-Ni-Mo is 0-K),12% P/h. It was shown that the temperatures above 1620°C protected steel bath against high chromium losses. At these temperatures the average value of phosphor oxidation ratę is 0,070% P/hour.