In the present work the corrosion behavior of 08Kh17T (analogue of AISI 439) ferritic steel, 12Kh13 (analogue of AISI 410) and 16Kh12MVSFBR ferritic-martensitic steels, and AISI 316L (analogue of 03Kh16N15M3), 12Kh18N10T (analogue of AISI 321) and 06KhN28MDT austenitic alloys was studied at 550°C in fused KCl-AlCl3 mixture with theinitial AlCl3EtoEKCl ratio of 1.1. The corrosion rates of the studied materials in the KCl-Коррозия различных типов нержавеющих сталей 87AlCl3 were determined. The corrosion processes in all the studied ironEbased steels were caused by the red-ox reactions resulting in dissolution of the most electronegative alloy comE ponents (Cr, Fe and Mn), that indicate the electrochemical nature of corrosion phenomena.