Patent ID: 8105415

Claim:
A method of making a steel with low carbon less than 0.035% by weight comprising the steps of: (a) preparing a heat of molten steel composition in a steelmaking furnace to a tapping temperature as desired for decarburizing at a vacuum tank degasser, (b) tapping open into a ladle the molten steel composition with an oxygen level between about 600 and 1120 ppm, (c) providing slag forming compound to the ladle to form a slag cover over the molten steel composition in the ladle, (d) transporting the molten steel composition in the ladle to a vacuum tank degasser, (e) decarburizing the molten steel composition at the vacuum tank degasser by drawing a vacuum of less than 650 millibars, (f) after decarburizing, transporting the molten steel composition in the ladle to a ladle metallurgical furnace, (g) prior to or after the step of transporting the molten steel composition in the ladle to a ladle metallurgical furnace, adding one or more deoxidizers to the molten steel composition, (h) prior to or after the step of transporting the molten steel composition in the ladle to a ladle metallurgical furnace, adding one or more flux compounds to desulfurize the molten steel composition, (i) deoxidizing the molten steel composition in the ladle metallurgical furnace, (j) after deoxidizing, transporting the molten steel composition in the ladle to the vacuum tank degasser, (k) desulfurizing the molten steel composition in the vacuum tank degasser, and (l) casting the molten steel composition to form a steel with low carbon less than 0.035% by weight.