Doerrenberg Edelstahl is a company that produces and supplies tool steel to the automotive, forging, and extrusion industries. It operates in four business divisions: Special Steels, Steel Foundry, Casting Products, as well as Coating and Hardening. The Special Steels business division stocks a variety of standardized mold steels and produces forging and rolling ingots. The Steel Foundry business division is divided into the areas of hollow and full mould casting. The Casting Products business division offers design solutions for filigree components. The Coating and Hardening business division provides hard-material coating, heat treatment, and various services including the production of rotationally symmetrical tools, polishing, coat removal, etc.