FLUX FOR CONTINUOUS CASTING OF MOLTEN STEEL CONTAINING ALUMINUM AND CONTINUOUS CASTING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent the melting point and viscosity of the flux from being largely fluctuated by preventing generation of depression (sink defect) on the slab surface, the slag inclusion, or break-out by the restriction of the slab in continuously casting the molten steel containing Al to provide the slab of excellent surface property. ;SOLUTION: The flux for continuous casting to continuously cast the molten steel containing at least 0.10wt.% Al, has the composition consisting of, by weight, 1.0-5.0% T.C., 10-30% SiO₂, 15-35% Al₂O₃, 25-40% CaO, 5-15% Na₂O, 5-15% F, 0-5% Li₂O, and ≤5% in total Fe₂O₃, MgO, etc., as inevitable impurities. The ratio of CaO/(SiO₂+Al₂O₃) is 0.7-0.9, and the viscosity at 1300°C of the flux is ≤2.0 poise. This flux is used in the continuous casting method of the molten steel containing Al.;COPYRIGHT: (C)1997,JPO