Method and device for producing stainless steel without using a supply of electrical energy, based on pig-iron that has been pre-treated in a DDD installation

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 (V8), and decarbonizing and alloying (V9) using autogenic chemical energy, wherein initially charging and heating (V8) are carried out in the first AOD-L converter (3) and decarbonization (V9) is initially carried out in the second AOD-L converter (4).