Daido DRM3 is a high-speed tool steel with both high hardness (66 HRC maximum) and toughness for improved life in dies. The alloy has excellent hardenability. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fatigue. It also includes information on high temperature performance as well as heat treating. Filing Code: TS-619. Producer or source: International Mold Steel Inc., Daido Steel.