Abstract
Synopsis Pressure vessels such as hydrocracking reactors are fabricated from 2.25 Cr‐1 Mo steel weld‐clad with austenitic stainless steel. In these reactors, hydrogen diffuses into the steels and can cause disbonding of the weld cladding after shut‐down and cooling to ambient temperature. This type of cracking can develop when the following three conditions are fulfilled: a) high localised concentrations of hydrogen; b) high tensile residual stresses; and c) the presence of a sensitive structure. The aim of this study is to clarify the influence of hydrogen diffusion on disbonding phenomena. A model was developed for calculating hydrogen distribution in steel claddings. The results were compared with hydrogen measurements and corroborated the theoretical model. The model can be used to predict or clarify the behaviour of the weld cladding with a view to preventing disbonding phenomena.
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