It is similar to the 309L grade, with the additional presence of approximately 2.50–3.00% molybdenum (Mo). This Mo addition is used to improve pitting corrosion resistance, particularly in chloride-containing environments. It is also preferred for creating a buffer layer beneath 316L during weld overlay applications, as well as for welding dissimilar materials such as carbon steels, manganese steels, and low-alloy steels.
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