Predict ferrite number (FN) in austenitic and duplex stainless steel weld metal from chemical composition using WRC-1992 correlations
Input Parameters
Results
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Cr Equivalent
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Ni Equivalent
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Ferrite Number (FN)
FN
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Weld Suitability
Note: Ferrite Number (FN) of 3-20 is generally desired in austenitic stainless steel welds to prevent hot cracking while maintaining corrosion resistance. AWS A4.2 defines FN measurement standards.
Reference
WRC-1992 Ferrite Number Prediction:
Creq = Cr + Mo + 0.7×Nb
Nieq = Ni + 35×C + 20×N + 0.25×Cu
FN estimated from Creq/Nieq position on WRC-1992 diagram
Optimal FN range: 3-20 FN for austenitic stainless welds