Abstract AISI 1045 is a medium-carbon steel used in four conditions: hot rolled, normalized, oil quenched and tempered or water quenched and tempered. It is a general-purpose engineering and construction steel and provides medium strength and toughness at low cost. It is commonly used for flame- or induction-hardened parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-44. Producer or source: Carbon and alloy steel mills.