Cast iron parts are divided into two categories: gray iron and ductile iron, with significant differences in strength and application scenarios. Choosing the wrong material can lead to early breakage of parts or cost waste.
Gray iron castings have graphite flakes, good vibration damping, low cost, and easy processing. Gray iron sand castings are suitable for parts such as machine tool beds, gearbox housings, flywheels, etc. that require high vibration reduction but do not experience significant stress. The gray iron oil pump body casting utilizes its good casting fluidity and is suitable for pump valve housings with complex shapes and moderate pressure resistance requirements.
Graphite in ductile iron castings is spherical in shape, with strength and toughness similar to that of steel. Ductile iron sand castings are used for automotive crankshafts, suspension brackets, gears, and other parts that withstand impact and alternating loads. Ductile iron automotive parts are lighter than gray iron and stronger than steel, making it the preferred material for automotive lightweighting.
Gray iron is suitable for vibration reduction, low cost, and moderate load; Ductile iron is suitable for applications that require high strength, impact resistance, and toughness. When selecting, first consider the load and working conditions before deciding on the material grade.
