The pitting resistance of an austenitic stainless steel can be related directly to alloy composition, where chromium, molybdenum and nitrogen are a weight %. The Pitting Resistance Equivalent Number (PREN) uses the following formula to measure an alloy’s relative pitting resistance - the higher the number, the better the pitting resistance.
PREN = %Cr + 3.3Mo + 30N
The following chart compares the PREN for LDX 2101 with other common stainless steel grade.
