Corrosion resistance of 18Cr-12Ni-2,5Mo steel annealed at 500-1050\0\C

• Published in: Corrosion science Vol. 41; no. 7; pp. 1305 - 1322
• Main Authors: Zahumensky, P, Tuleja, S, Orszagova, J, Janovec, J, Siladiova, V
• Format: Journal Article
• Language: English
• Published: 01.07.1999
• ISSN: 0010-938X

Under certain conditions, austenitic stainless steels become sensitized, a phenomenon which refers to their susceptibility to intergranular corrosion resulting from microstructural changes. In this study, electrochemical potentiokinetic reactivation (EPR) and Strauus tests were used to determine the corrosion resistance of 18CR-12Ni-2,5Mo steel, the main aims of the study being to determine the degree of sensitization of 25 differently annealed states and to compare their ability to sensitization with states after solution treatment and long-term service, to construct time-temperature sensitization diagrams for the steel and to compare the results achieved by the EPR methods (single and double loop tests), and to assess the cause of sensitization. The main points from the results of all these investigations were as follows: annealing at 650\0\C for 100h led to the highest sensitization among experimental states; the sensitization degree at 800, 900 and 950\0\C can be practically neglected; and the results measured by the two different EPR methods and the Strauss test were conformable. (Abstract quotes from original text)