Patent ID: 8430945

Claim:
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, the liquid pig-iron is subsequently heated, refined or alloyed, reduced in an AOD (Argon-Oxygen Decarbonization) converter, and subsequently an adaptation/adjustment of treated steel melt in a ladle furnace is carried out, wherein, for stainless steel production of all stainless qualities in an austenitic range as well as in a ferritic range a slag-free liquid pig-iron quantity is separated and introduced into two classical Twin AOD-L (Argon-Oxygen Decarbonization-Lance) converters in which with a parallel contrary sequence chemical process steps of a DDD-treatment (dephosphorization, desiliconization, desulphurization), of heating, of decarbonizing and alloying are carried out using autogenic chemical energy, wherein initially the DDD-treatment is carried out in a first of the Twin AOD-L converters and decarbonization is initially carried out in a second of the Twin AOD-L converters.