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4.6.4SulfurThe use of molds bonded with furane resin catalyzed with sulfuric and/or sulfonic acid causesproblems for ferrous castings because of the pick-up of sulfur in the surface of the casting (Naro andWallace 1992). This is especially serious for ductile iron castings, because the graphite reverts fromspheroidal back to flake form in this high-sulfur region. This has a serious impact on the fatigueresistance of the casting
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