Забезпечення наднизького вмісту сірки в процесі позапічної обробки сталі

Abstract

An effective method of steel desulfurization, which provides up to 0,002 ... 0,003% sulphur content reduction in the finished rolled steel products, has been developed. Partial removal of sulfur occurs in the furnace unit and ultra-low sulphur content is achieved by creating a high-basic refining slag during out-of-furnace steel treatment in the ladle-furnace unit. The proposed technological method improves quality indicators of the metal by regulated introduction of appropriate reagents (lime, fluorspar). It has been determined that additional introduction of silicocalcium wire into the steel at the end of the out-of-furnace treatment makes it possible to reduce sulfur content to 0.002%.