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During the past 20 years, the malleable iron-founding industry has experienced technical developments which have fundamentally altered both the character of the industry and its products. The unique combination of engineering properties for a cast metal is summarized for ferritic and pearlitic malleable iron, and the structural characteristics of the material are reviewed. New design techniques recognize the significance of molding aggregate and metallurgical factors, and the importance of the “feeding path” and “freezing order” concepts is emphasized. Recently developed machinability information is presented in tabular form, and reference is made to the general process capabilities of high-volume malleable iron casting producers for use by casting designers and engineers. New information on fatigue life of as-cast surfaces and postforming operations is discussed.
malleable iron castings, feeding path, freezing order, crystallization, machining, welding, mechanical properties, postforming, fatigue, machinability, tests, evaluation, gray iron castings, ductile iron castings, metals
Heine, H. J.
Technical director, Malleable Founders Society, Cleveland, Ohio