A. M. 3 Die Steel is a medium-carbon, 5% chromium tool and die steel having high resistance to heat checking and erosion of die-casting dies and other hot work tools. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-162. Producer or source: A. Milne & Company (Distributor).