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Calculate the Corrosion Resistance of your Stainless Steel

Last Updated: 25/5/21 at 8:34am

Author: Jamie Hunt

PREN Corrosion Calculator for Stainless Steel

A grade's resistance to pitting corrosion can be estimated and calculated by a PRE value or PREN (Pitting Resistance Equivalent Number). This number is an approximate guide for the corrosion resistance of each Stainless grade.

Stainless Steel PREN Calculator

Calculate your own PRE value by selecting your stainless grade and entering the element percentages. Your PRE value will appear below:

  Chromium (Cr)
  Molybdenum (Mo)
  Nitrogen (N)


Our range of articles listed below gives you a good understanding of how to maintain your stainless steel and also calculate the resistance of your stainless steel.

How is PREN Calculated?
How is PREN Calculated?
A guide to PREN in Stainless Steel and how it is calculated.
Which is better, 304 or 316 SS?
Which is better, 304 or 316 SS?
Different grades of stainless steel and which grade to use for an application will largely come down to several factors.
Do's and Dont's of Stainless
Do's and Dont's of Stainless
To help you avoid the common mistakes when using stainless, we have put together a short do's and dont's guide along with a cleaning schedule.
Super Duplex 2507 Stainless Steel
Super Duplex 2507 Stainless Steel
Super Duplex (2507 SS) is 100% corrosion resistant in saltwater (has a minimum PREN value of 41) and can withstand the harshest environments!

About Jamie Hunt

Jamie Hunt is the CEO of Anzor Fasteners Ltd, with 24 years of procurement and supply of Stainless Steel Fasteners and Hardware under his belt. He also has Olympic yachting experience and is a Certified ISSF Stainless Specialist.

Jamie is a member of the New Zealand Stainless Steel Development Association and has written many articles including "The Stainless Steel Guide", "Can you paint stainless steel?" and "Are stainless fasteners OK with treated timber?". Check out Jamie on his LinkedIn profile for more information.

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