Relative Corrosion Resistance of Stainless Steels

The simplest way of comparing the corrosion resistance properties of stainless steel grades is by using Pitting Resistance Equivalent Number. The pitting resistance can be directly related to its alloy composition where Chromium, Molybdenum and Nitrogen are a weight.

PREN = % Cr + 3.3Mo + 30N

Corrosion Resistance Comparision