PREN (pitting resistance equivalent number)

An index of a stainless steel's resistance to pitting corrosion: PREN = %Cr + 3.3 × %Mo + 16 × %N (30 × %N in some duplex formulas). Higher is better; seawater service typically asks for PREN above 40.

More terms

Annealing · Austenite · Bainite · Carbon equivalent (CEV) · Carburizing · Case hardening · Charpy impact test · Cold drawn · Decarburization · Elongation (A) · ESR (electroslag remelting) · Ferrite