THYROPLAST 2083 SUPRA ESR is an electroslag remelted (ESR) stainless tool steel (modified AISI 420) with cleanliness for polishing and good toughness and erosion resistance. This datasheet provides information on composition and physical properties. It also includes information on heat treating, machining, and joining. Filing Code: SS-572. Producer or source: Thyssen Specialty Steels Inc.