DH31-EX® is an ultra high strength, tough, and high heat check resistant hot work die steel. It offers high toughness, high strength, high hardenability, and resistance to softening. It excels in aluminum die cast dies, forging dies, and aluminum extrusion dies. This material is NADCA approved. DH31-EX® is available in Plate, Block, and Rounds*. The optimal hardness range is 43-54 HRC.