Patent ID: 6547849
Filing Date: 2003-04-15
Classification: B22D,C21C

Abstract:
A method of refining steel in a ladle, including heating a steel charge and slag forming material in a ladle to form molten steel covered by a slag containing silicon, manganese and calcium oxides, wherein the molten steel has a carbon content in the range 0.001% to 0.1% by weight, a manganese content in the range of 0.1% to 2.0% by weight and a silicon content in the range 0.1% to 10% by weight, and stirring the molten steel by injecting an inert gas into it to cause silicon/manganese deoxidation and desulphuization of the steel to produce a silicon/manganese killed molten steel having a sulphur content of less than 0.01% by weight.