WATERDIE EXTRA is a high-quality water-hardening tool steel alloyed with chromium to give increased depth of hardened case with added resistance to abrasion. When quenched in water or brine, it develops a deep, uniform high-hardness case with a tough shock-dampening core. This steel gives outstanding performance in large-section tools and dies that demand the strength of an extra-deep hardened case backed by a tough core. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-477. Producer or source: Columbia Tool Steel Company.