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Interstitial-free (IF) steels are known to exhibit intergranular (IG) fatigueunder certain conditions. This paper explores two issues; alloy conditions under whichIG fatigue occurs and whether the fatigue performance in the presence of an IG crackpath is lower than similar IF steels which exhibit a transgranular crack path. Toexplore this latter issue fatigue performance is presented as a function of yield strength.