PREN & Service Envelope Calculator

Enter a composition, or pick a grade to prefill it. The published threshold for seawater pitting protection is a minimum PREN of 32.

Composition Parameters

Prefill from grade

Chromium %Cr

Molybdenum %Mo

Nitrogen %N

Tungsten %W (optional)

Evaluation Result

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Awaiting input parameters…

Input Chromium, Molybdenum, Nitrogen, and Tungsten values to calculate the service envelope.

Formula used

Standard Formula	Result
%Cr + 3.3 x %Mo + 16 x %N	—
%Cr + 3.3 x (%Mo + 0.5 x %W) + 16 x %N	—

Have measured chloride and temperature data? Request a quote and we will state which grade we would supply, and where a familiar grade is being asked to do a job it cannot hold.