The Pitting Resistance Equivalence Number, PREN, is a measure of relative pitting corrosion resistance of stainless steel in a chloride-containing environment.
Higher PREN values indicate greater corrosion resistance.
The Ferritic & Austenitic SS grade formula for PREN is: PREN = %Cr + 3.3 x %Mo + 16 x %N
The Duplex SS grade formula for PREN is: PREN = %Cr + 3.3 x %Mo + 30 x %N
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