Production Technology for Low-Carbon, Low-Sulfur Boron Steel

摘要

A technology for slag formation in the ladle-furnace unit is considered; the slag is based on the CaO-SiO_2-MgO-Al_2O_3-B_2O_3 system. This technology permits both microalloying of the steel with boron (reduced from the oxide phase) and desulfurization of the steel. The resulting boron content in the steel is 0.001-0.008; the sulfur content in low-alloy steel and pipe steel is low (0.004-0.010); and the consumption of manganese ferroalloys is reduced to 0.5 kg/t for 08 kп steel and 1.4kg/tfor 09Γ2C steel. In addition, the proposed technology increases the strength of the rolled steel, without loss in its plasticity; and reduces the environmental impact thanks to the replacement of fluorspar by colemanite.