Iron Casting Grades Explained: Gray Iron, Ductile Iron, and Applications by Matech Iron Castings Manufacturer
Cast iron remains one of the most widely used engineering materials thanks to its excellent castability, machinability, and cost efficiency. Yet not all cast iron is the same. Gray iron and ductile iron offer very different properties, and selecting the right grade can make a major difference in part performance and service life. Matech, a dependable iron castings manufacturer , produces gears, brackets, pump housings, and structural components in both materials, helping customers in cement, agriculture, and construction choose the iron grade that best suits their application. What Makes Cast Iron Unique Cast iron is an iron-carbon alloy with a higher carbon content than steel, typically between two and four percent. This high carbon level lowers the melting point and improves fluidity, allowing the metal to fill complex molds easily. The way carbon forms within the iron determines the material's properties. In gray iron, carbon appears as flakes of graphite, while in ductile iro...