Stainless Steel for Improved Mold Base Tooling

For many years, EDRO Engineering, Inc. (Walnut, CA) (custom mold base mfg) and other regular users of prehardened stainless holder steels believed the standard 420F material needed improvement.

For many years, EDRO Engineering, Inc. (Walnut, CA) (custom mold base mfg) and other regular users of prehardened stainless holder steels believed the standard 420F material needed improvement. Its main shortcomings included a lack of toughness, unpredictable stability, inconsistent machinability and poor weldability. In response, EDRO Specialty Steels, Inc. began an intensive R&D program in 1992. After extensive metallurgical and machining tests, the final product RoyAlloy™ was introduced and patented in 1996. RoyAlloy™ is a pre-hardened free machining 400 series stainless steel, developed specifically for improved plastics mold base tooling. Today, RoyAlloy™ Stainless steel has become the preferred steel of choice, accounting for more than 70 percent of all pre-hardened stainless mold base plates sold in North America. RoyAlloy™ demonstrates significant improvements in all areas, with features including enhanced machinability, improved stability, greater toughness, better weldability, and more consistent uniformity and hardness when compared with 420F.