Pitting Resistance

Stainless Steels are vulnerable to corrosion by pitting. Higher the concentration of Chromium (Cr), Molybdenum (Mo) and Nitrogen (N) better the resistance to pitting. The Pitting Resistance Equivalent (PRE) Number is a good quantitative guide of resistance to pitting.

PRE = (%Cr) + (3.3x%Mo) + (16 x %N)

Higher the PRE Number, better the resistance.