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PREN Calculator

Calculate the commonly used PREN value from chromium, molybdenum and nitrogen content.

TECHNICAL CALCULATORFORMULA INCLUDED

Technical calculator

PREN Calculator

Calculate the commonly used PREN value from chromium, molybdenum and nitrogen content.

PREN Calculator

Enter chromium, molybdenum and nitrogen mass percentages.

FormulaPREN = %Cr + 3.3 × %Mo + 16 × %N.

Enter values and keep the result with the quotation assumptions.

Calculation result

Enter values and calculate.

Use PREN for early alloy comparison. Confirm grade, standard, chloride exposure, temperature and supplier test records.

  • Composition-based PREN screening
  • Chromium, molybdenum and nitrogen inputs
  • Engineering review reminder

Technical reference

PREN Calculator basis and limits

This calculator applies the common PREN screening equation to entered alloy composition values.

PREN indicates relative pitting resistance from composition only. It does not approve a grade for a service environment.

Important Use the result for quotation preparation and early planning; it does not replace a certified measurement, drawing review or supplier confirmation.

Calculation method

Formula and worked example

01

PREN Calculator formula

Use the inputs and units shown in the calculator, then review the assumptions before using the estimate.

PREN = %Cr + 3.3 × %Mo + 16 × %N.
02

Worked example

For 18% Cr, 2.1% Mo and 0.05% N, the calculated PREN is 25.730.

18 + (3.3 × 2.1) + (16 × 0.05) = 25.730

Purchasing guide

Buying notes

State grade, standard, product form, dimensions, quantity and destination. Ask the supplier to confirm the assumptions used for PREN calculator.

01

Input units

Use the units shown beside each field.

02

Formula check

Review the formula and worked example.

03

Grade context

Record grade, standard and material condition.

04

Tolerance

Keep tolerances with the quotation record.

05

Application

State the process or fabrication use.

06

Delivery

Include quantity, destination and target date.

Quotation planning

How to use this estimate

Use the calculated result to compare supplier offers and prepare a quote, then confirm the exact grade, standard, dimensions and test requirements.

Review limits

What can change the result

  • Input units, rounding and dimensional tolerances.
  • Material density, condition and processing allowance.
  • Keep source values with the quotation record.

Request for quotation

Send your PREN Calculator requirement

Include the calculated result together with grade, product form, dimensions, standard, application, quantity and destination.

  • Grade and standard
  • Product form and dimensions
  • Application, quantity and destination
SSM Quote Request

Frequently asked questions

PREN Calculator FAQ

It provides an indicative PREN calculator result from the values entered and the stated assumptions.