What is the material of castable steel?

Ductile Iron is a casting material, also known as ductile iron, which is an iron-carbon alloy, usually containing 2.2%-4.5% carbon and 1%-3% silicon, and adding some alloying elements ( Such as nickel, chromium, molybdenum, etc.) to improve its mechanical properties and corrosion resistance. Compared with ordinary gray cast iron, castable steel has higher strength and toughness, and also has good machinability, so it is widely used in automobiles, engineering machinery, aerospace and other fields.