HY-TEN B TEMPER No. 3-X is a strong, tough alloy steel of high hardenability recommended for heavy duty applications. 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: SA-103. Producer or source: Wheelock, Lovejoy & Company Inc..