FAGERSTA-D66 is a 9% tungsten type hot-work tool and die steel having excellent combination of abrasion resistance, red-hardness and toughness at high operating temperatures. It is recommended for hot extrusion and forming dies, punches, rivet sets, shear blades, etc. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-202. Producer or source: Fagersta Steels Inc..