MOLD FLUX FOR CONTINUOUSLY CASTING STEEL AND METHOD OF CONTINUOUSLY CASTING STEEL USING THE SAME
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United States of America Patent
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app pub date -
Nov 16, 2009
filing date -
Jul 7, 2009
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Abandoned
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Abstract
Mold flux for continuously casting steel which contains SiO.sub.2, T.CaO, Al.sub.2O.sub.3 and MgO as main components, one or two or more of alkali metal oxides, and further the constituent F, while the ratio of the T.CaO content to the SiO.sub.2 content being from 0.7 to 2.0, the Al.sub.2O.sub.3 content being 35% or less, the MgO content being 20% or less, the total content of alkali metal oxides being 8% or less, the F content being 7% or less, characterized in that each of the contents expressed by formulae (b) to (e) below satisfies the formula (a): 0.63+2.51.times.Y.sub.Al2O3.ltoreq.Y.sub.CaO/Y.sub.SiO2.ltoreq.1.23+2.51.- times.Y.sub.Al2O3 . . . (a), Y.sub.SiO2=X.sub.SiO2/(X.sub.SiO2+X.sub.CaO+X.sub.Al2O3+X.sub.MgO) . . . (b), Y.sub.CaO=X.sub.CaO/(X.sub.SiO2+X.sub.CaO+X.sub.Al2O3+X.sub.MgO) . . . (c), Y.sub.Al2O3=X.sub.Al2O3/(X.sub.SiO2+X.sub.CaO+X.sub.Al2O3+X.sub.Mg- O) . . . (d), and Y.sub.MgO=X.sub.MgO/(X.sub.SiO2+X.sub.CaO+X.sub.Al2O3+X.sub.MgO) . . . (e). Continuous casting of a round billet using this mold flux can effectively prevent the generation of pin-hole defects and longitudinal cracking.
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