How do super duplex stainless steels compare with Alloy 316? Stainless Steels
There is a considerable improvement in the mechanical and physical properties of super duplex stainless steel vs 316. Alloy 316 is perhaps the most widely used austenitic stainless steel, and for many applications is the baseline product. However, for more demanding applications, there is a choice of alternative stainless steels. For most applications with an operating temperature range of -50degC to 250degC, super duplex stainless steels provide a cost-effective option. Their yield strength is typically 3-4x greater than Alloy 316. In addition, their pitting resistance equivalent number (PREN) is >40 compared with 25, providing far better corrosion performance. Alloy 316 can be used for lesser marine environments, whilst super duplex stainless steels are recommended for long-term immersion in seawater.
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