FIELD: metallurgy.
SUBSTANCE: casting flux has the following chemical composition, wt %: Na2O 5-10, MgO 3-10, MnO 3-10, B2O3 3-10, Al2O3≤6, Li2O <3, C 1-3, the rest us CaO, SiO2 and unavoidable impurities. The ratio of CaO/SiO2 is 0.8-1.3. Intensity of flux crystallization comprising 10-50% is determined by the fraction of crystals in the body cross-section of the solidified flux after melting of 50±2 g of the flux and the temperature at 1350±10°C and natural cooling in the steel crucible.
EFFECT: introduction of boron-containing component into non-fluoride flux provides effective control of heat transfer from molten steel without negative effect of fluorides on human health.
9 cl, 1 dwg, 1 tbl
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