REFINING METHOD OF BORON-ADDES MOLTEN STEEL FOR THIN SLAB

摘要

PURPOSE: A boron-added molten steel for manufacturing a thin slab and a refining method thereof are provided to reduce production cost as the strength of a coil is controlled using cheap manganese while reducing the amount of boron. CONSTITUTION: A boron-added molten steel for manufacturing a thin slab is composed of 0.006 wt.% or less of C, 0.4 wt.% or less of Mn, 0.001-0.008 wt.% of S, 0.03 wt.% or less of B, and the rest of Fe. The content of Mn and S is Mn/S>=50. [Reference numerals] (AA) Start; (BB) End; (S10) Melding scrap iron with an electric furnace to produce molten steel; (S20) Deoxidizing by adding a deoxidizer; (S30) Putting alloy iron into the molten steel to be adjusted to alloy components where manganese and sulfur satisfy Mn/S>=50 and manufacturing boron-added steel;