Carpenter Silicon Core Iron A-FM, melted to exacting chemical specifications and carefully process controlled to produce a fine-grained uniform quality magnetic core iron. This alloy exhibits improved machining characteristics over Silicon Core Iron A (Alloy Digest Fe-94, January 1991). This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on heat treating and machining. Filing Code: FE-108. Producer or source: Carpenter.