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It accounts for Nitrogen and Copper, which are vital for modern duplex and high-alloy stainless steels. Ferrite Number (FN) Accuracy: Instead of just "volume percentage," it uses the Ferrite Number (FN) wrc-1992 diagram calculator
This is the "dirty secret" of the WRC-1992 diagram. Do you own an original WRC-1992 diagram card or a replica