BTR is an oil hardening, non-deforming, general purpose tool steel. It has a good combination of abrasion resistance and toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-127. Producer or source: Bethlehem Steel Corporation.