Patent ID: 8048196
Filing Date: 2011-11-01
Classification: C21C

Abstract:
1. Method for stainless steel production without electrical energy supply based on liquid pig-iron and FeCr solids, wherein, after a pretreatment in a blast furnace ( 1 ) and a DDD treatment (dephosphorization, desiliconization, desulphurization) in a DDD installation ( 2 ), the liquid pig-iron is subsequently heated, refined or alloyed, reduced in an AOD (Argon Oxygen Decarburization) converter ( 3 , 4 ), and subsequently an adaptation/adjustment of the treated steel melt in a ladle furnace ( 5 ) is carried out, wherein, for stainless steel production of all stainless qualities in the austenitic range as well as in the ferritic range a slag-free liquid pig-iron quantity pretreated in a DDD installation ( 2 ) is separated and introduced into two classical Argon Oxygen Decarburization with Lance (AOD-L) converters ( 3 , 4 ) that carry out, in a parallel contrary sequence, the necessary chemical process steps of heating (V 8 ), and decarbonizing and alloying (V 9 ) using autogenic chemical energy, wherein initially charging and heating (V 8 ) are carried out in the first AOD-L converter ( 3 ) and decarbonization (V 9 ) is initially carried out in the second AOD-L converter ( 4 ).