Method of and smelter for producing steel with high manganese and low carbon content

Abstract

A method of and a smelter for producing steel ( 1 ) with a high manganese and low carbon content on the basis of liquid pig iron ( 2 ) or liquid steel ( 3 ) and slag-forming constituents ( 4 ) with the object of preventing existing drawbacks of process route in vessels other than, e.g., electrical arc furnaces ( 18 ). With steel produced with a high manganese and low carbon content, in a process, the carbon component is reduced to about 0.7-0.8% by a combined blowing of oxygen ( 7 ) through top lances ( 8 ) and underbath nozzles ( 9 ) after feeding of liquid ferro-manganese (50 and liquid steel ( 3 a ) in a FeMn-refining converter (6 a ), wherein a component of a cold end product from premelt is added as cooling means ( 10 ), and wherein the carbon component is reduced to about 0.05-0.1% C by a continuous blowing of oxygen ( 7 ) through the underbath nozzles.

1 . A method of producing steel ( 1 ) with a high manganese and low carbon content on the basis of liquid pig iron ( 2 ) or liquid steel ( 3 ) and slag-forming constituents ( 4 ), characterized in that
 the process is carried out by feeding liquid ferro-manganese ( 5 ) with about 6% of C and liquid steel ( 3 ;  3   a ) with about 0.1% C, or liquid pig iron together with a necessary amount of slag-forming constituents, in a FeMn-refining converter ( 6   a ), the carbon component is reduced to about 0.7-0.8% by a combined blowing of oxygen ( 7 ) through a top lance ( 8 ) and underbath nozzles, thereafter, a component of a cold end product from premelt is added as cooling means and thereafter, the carbon content is reduced to about 0.05-0.1% C by a continuous blowing of oxygen ( 7 ) through the underbath nozzles ( 9 ).   
   
   
       2 . A method according to  claim 1 ,
 characterized in that   a partial pressure is reduced by the combined blowing of oxygen ( 7 ) and   an oxygen-inert gas mixture ( 11 ) through the top lance ( 8 ) or through the underbath nozzles ( 9 ).   
   
   
       3 . A method according to  claim 1 ,
 characterized in that   all of the process steps are carried out in a temperature range between 1630-1650° C.   
   
   
       4 . A method according to  claim 1 ,
 characterized in that   SiMn and/or FeAl is added to melt ( 13 ) in a ladle furnace ( 12 ) for adjusting an analysis.   
   
   
       5 . (canceled) 
   
   
       6 . A smelter for producing steel ( 1 ) with a high manganese and low carbon content on the basis of liquid pig iron ( 2 ) or liquid steel ( 3 ) and slag-forming constituents ( 4 ), characterized in that
 in a material flow, on one hand, a reducing furnace ( 16 ) for ferro-manganese and on the other hand, of a blast furnace ( 17 ) for pig iron ( 2 ) or a steel-smelting converter ( 6 ) for carbon steel ( 3   a ) or an electrical arc furnace ( 18 ) are arranged upstream of a FeMn-refining converter ( 6   a ), and a ladle furnace ( 12 ) adjoins it in a process path.