Stress corrosion cracking mechanisms in austenitic stainless steels

Austenitic stainless steels in the composition range of 18-25%Cr, 8-20%Ni are widely employed in chemical, petroleum, petrochemical, process, paper and pulp industries due to their excellent corrosion resistance combined with desirable mechanical properties. Though, the austenitic stainless steels provide excellent resistance against general corrosion, they are highly susceptible to various forms of localized corrosion and in particular stress corrosion cracking (SCC) in chloride containing environments. The three major governing factors namely, electrochemical metallurgical and mechanical involved in SCC make the understanding much more complex. Since, the consequences of SCC of components could be very severe, there has been a growing interest on this aspect. The present study is therefore aimed at providing a comprehensive understanding of the interplay of alloying elements on one hand and the environment on the other towards SCC. To achieve this objective, six different commercial grades of austenitic stainless steels were chosen to understand the effect of Mo, Mn and Ni. More Info

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