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Ferrite contents/Ferrite Number in Duplex and Super Duplex Stainless Steels

(Photo by  Fischer Feritscope®  FMP30C - Link:  https://www.verniersales.com/ferrite-content  ) To convert from ferrite % to FN, the following can be used: For 22 % Cr duplex stainless steel, ferrite % = 0.7 × FN; For 25 % Cr duplex and super duplex stainless steels, ferrite % = 0.65 × FN. Refer to  API RP 582 2016  Section 11.3.4.3 Weld metal: 30 to 65% HAZ: 40 to 65 %  Base metal: 40 to 60%