SIMULTANEOUS DEOXIDIZING AND DESULFURIZING AGENT FOR MOLTEN STEEL AND METHOD FOR SIMULTANEOUSLY DEOXIDIZING AND DESULFURIZING MOLTEN STEEL USING IT

摘要

PROBLEM TO BE SOLVED: To provide a simple Mg addition technique at a low cost by utilizing the single metallic Mg as a blending component without using an alloying- treated Mg. ;SOLUTION: A simultaneously deoxidizing and desulfurizing agent for molten steel satisfies the formulas I, II, III for the composition of the blending components of the agent which has compn. consisting of 5-25wt.% metallic Mg and the balance MgO and CaF₂ and further, containing CaO at need. The formula I (by wt.%): metallic Mg(%)+MgO(%)+CaO(%)+CaF₂(%)≥90. The formula II (by wt.%): 1≤MgO(%)/CaF₂(%)≤1.5. The formula III (by wt.%): MgO(%)≥1.5 × metallic Mg(%). Further, this simultaneously deoxidizing and desulfurizing agent is coated with an iron to be formed in a wire shape and added into molten steel at supplying velocity of 0.2-0.8kg/t-molten steel/min expressed in terms of the pure Mg supplying velocity.;COPYRIGHT: (C)1997,JPO