CROMO-W55 is a medium-carbon air-hardening tool steel for cold-work applications. It is useful for special tools because it has a combination of good wear resistance, toughness and high hardenability. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-275. Producer or source: Bethlehem Steel Corporation.