Abstract
The susceptibility to intergranular corrosion of several austeno-ferritic stainless strip claddings on a pressure vessel steel after stress relief heat treatment has been investigated. With the aid of the normal Strauss test and other test methods it has been shown that even non stabilized layers deposited by the submerged arc welding process can be optimized with respect to their chromium and carbon (and hence ferrite) content such as to ensure sufficient corrosion resistance after annealing at temperatures between 580°C and 620°C. From time-temperature-sensitization (TTS) diagrams it may be concluded that the limiting temperature above which sensitization is no more possible can be essentially lowered by increasing the chromium to carbon ratio without risking sigma phase precipitation. Mechanism leading to the different kinetics of chromium depletion at grain boundaries in wrought austenitic and weld deposited austeno-ferritic stainless steels are discussed.
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