Aluminum-containing austenitic stainless steel resistant to liquid lead and bismuth corrosion and preparation method of aluminum-containing austenitic stainless steel

• Main Authors: LUO YANNI, HE WEI, SHEN LIN, HUANG YINQIANG, WEN YUHUA
• Format: Patent
• Language: Chinese; English
• Published: 13.01.2023
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Aiming at the problem of contradiction between rapid formation of an Al2O3 film on the surface of the aluminum-containing austenitic stainless steel in an oxygen-containing liquid lead bismuth environment and long-term stability of an austenitic matrix, the invention provides the component design of the liquid lead bismuth corrosion-resistant aluminum-containing austenitic stainless steel and the preparation method of the liquid lead bismuth corrosion-resistant aluminum-containing austenitic stainless steel. The invention provides aluminum-containing austenitic stainless steel resistant to liquid lead and bismuth corrosion. The aluminum-containing austenitic stainless steel resistant to liquid lead and bismuth corrosion is characterized in that chemical components of the steel are converted into chromium equivalent Creq and nickel equivalent Nieq according to the formula that Creq = Cr + 1.5 Si + 0.5 Nb + Mo + 2.5 Al and Nieq = Ni + 0.5 Mn + 30C, and then Creqgt is met; 17.8, 1.08 < Creq > to 7.67 < lt >; nie