Profile: Dongguan Songshun steel is a steel supplier. Our products include cold work mold steel, plastic mold steel, hot work mold steel, and alloy steel. We also offer high speed steel, carbon steel, and free cutting steel. AISI 1045 steel is high-quality medium-carbon steel with high strength. It also can be called C45 steel. It is usually used in normalized condition because of its bad hardenability. It needs to be quenching and tempering treatment to get higher mechanical performance. It is used to manufacture machine parts with high strength requirements. Such as gears, shafts, piston pins, and etc. 1045 Steel properties and heat treat as below.