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Overlay Pass & Fe-Dilution Estimator
How many passes an Inconel-class overlay needs to clear the iron-dilution spec.
minimum overlay passes
Target surface iron (Fe)
Total overlay thickness
Undiluted alloy retained
Sour hardness limit
Verification
A single pass on carbon steel reads ~23% Fe and fails any acceptance spec — pass count, not nominal thickness, governs dilution. Values reflect industry practice (Fe≤5% at 2.5 mm depth, EDX-verified); your project spec and qualified procedure govern.
