MAGNESIUM AZ91B is a standard magnesium die casting alloy patterned for the needs of the commercial casting industry. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, machining, and surface treatment. Filing Code: Mg-36. Producer or source: Apex Smelting Company.