Ti METHOD FOR CONTROLLING TI CONCENTRATION IN STEEL AND METHOD FOR PRODUCING SILICON-DEOXIDIZED STEEL

摘要

A method for controlling the Ti concentration in steel during the production of silicon deoxidized steel containing 0.1 to 3 mass% of Si and 0.0001 to 0.005 mass% of Al by performing the drawing and refining on the molten steel, in the said slag is how expression (1) to expression control of a Ti concentration in the steel satisfying the (7) below at the end of the chwigwa polishing, and a step of adding an oxide containing TiO ₂ for . 0.5? CaO / SiO _2? 1.8 (1) 4% ≤Al ₂ O ₃ ≤20% by mass (2) mass MgO? 15 mass% (3) 1.5 mass% ≤TiO ₂ ≤10% by mass (4) _{CaO + SiO 2 + Al 2 O} 3 + MgO + TiO 2 (5) ≥90 % by weight 0.4? TiO ₂ / MnO? 5 (6) 1? TiO ₂ /T.Fe? 10 (7) (Wherein the compound represented by the chemical formula in the formula is the content expressed in mass% of the compound and T.Fe is the sum of the concentrations represented by the mass ratio of Fe contained in the Fe oxide in the slag)