Named after W. T. DeLong. The DeLong Diagram is a method of calculating the Ferrite Number (FN) of a stainless steel weld deposit from its chemical composition. The DeLong Diagram is a modified Schaeffler Diagram predicting the Ferrite Number up to a

maximum of 18. Ferrite is important in a weld because it is known to be beneficial in reducing cracking or fissuring in weld metal. See SCHAEFFLER DIAGRAM, WRC 1992 (FN) Diagram, and ANSUAWS A5.22, Specification for S tianless Steel Electrodes for Flux Cored Arc Welding and Stainless Steel R.ods for Gas Tungsten Arc Welding

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