Melting methods for low-carbon ultra - low-sulfur steel

摘要

The present invention discloses a melting methods for low-carbon ultra - low-sulfur steel, whereby the following are used: back casting of the molten iron → pretreatment of the molten iron oxygen treatment media in the converter → vacuum decarburization in the rh furnace → alloy and vacuum degassing in the rh furnace → deoxidation of the aluminum wire and aluminium cable in the lf refining furnace, kalkschlackentstehung → ccm (continuous casting) - process, wherein a decarburization and a desulfurization in cooperation with slag removal during the desulfurization of the molten iron, optimization of the converter - steel output - acidic substance media system and of the slag generation system, vacuum decarburization in the rh furnace, alloy, degassing control, diffuse deoxidation and slags generation of the aluminum wire in the lf the furnace and the precipitate - deoxidation of the aluminum feed line can be realized. In this case, the center of gravity to provide a process optimization by the combination between the converter - steel output - acidic substance wish at operation, the deeper and deeper desulfurization decarburization in rh in the lf furnace to be realized in an appropriate ladles - argon gas - bottom blowing checking during the entire melting process and a complete unfolding of the metallurgical thermodynamic and kinetic conditions for the carbon content of control and desulphurization, so that the decarburization in the rh furnace is stable and the axle - desulfurization slag in the lf oven, and the control of the carbon increase in a marked effect, as a result, the melting of low-carbon ultra - low-sulfur steel is realized.