COLUMBIA SPECIAL is the manufacturer's highest quality best grade of water-hardening tool steel. It contains small amounts of chromium and vanadium. Its manufacture is controlled closely to insure uniform predictable hardenability. When brine quenched it develops a uniform high-hardness case of medium depth with a tough shock-dampening core. It is noted for its combination of high resistance to abrasion and high toughness. COLUMBIA SPECIAL'S many applications include dies for many uses, reamers, taps, drills, punches, gages and wood knives. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-466. Producer or source: Columbia Tool Steel Company.