ESCO Alloy 12M is a low alloy, medium carbon content, hard, shock and impact-resisting steel recommended for heavy duty cast parts. Minor chemical composition variations and heat treatment are employed in order to develop specific properties. This alloy possesses exceptional toughness at low temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on casting, heat treating, machining, and joining. Filing Code: SA-126. Producer or source: ESCO Corporation.