Carpenter Silicon Core Iron B-FM is melted in electrical arc furnaces to exacting chemical specifications and is carefully controlled in rolling and annealing practices to produce a fine-grained uniform quality magnetic core alloy. Silicon Core Iron B-FM has improved machining characteristics over Carpenter Silicon Core Iron B (see Alloy Digest Fe-90, April 1990). This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming, heat treating, and machining. Filing Code: FE-116. Producer or source: Carpenter.