LOW COST MAKING OF A LOW CARBONamp;NBSP; LOW SULFURamp;NBSP; AND LOW NITROGEN STEEL USING CONVENTIONAL STEELMAKING EQUIPMENT

摘要

A method of making a steel with low carbon less than 0.035% by weight including steps of preparing a heat of molten steel composition in a steelmaking furnace to a tapping temperature as desired for desulfurization at a VTD tapping open into a ladle the molten steel composition with an oxygen level between about 600 and 1120 ppm providing slag forming compound to the ladle to form a slag cover over the molten steel composition in the ladle transporting the molten steel to a VTD decarburizing the molten steel composition at the VTD by drawing a vacuum of less than 650 millibars after decarburizing transporting the molten steel to an LMF and deoxidizing the molten steel composition after deoxidizing returning to the VTD to desulfurize and degas the molten steel composition and casting the molten steel composition to form a steel with low carbon less than 0.035% by weight.