Ductile iron casting, also known as spheroidal graphite iron (SGI), is a casting method where molten iron is alloyed with magnesium to produce a material that has spherical graphite inclusions. This structure gives the iron improved strength, ductility, and toughness compared to regular gray iron.

Applications: Automotive parts (e.g., crankshafts, suspension components), heavy machinery, and pipes.

Advantages:

• High strength and ductility.
• Better fatigue resistance.
• Suitable for high-load applications.

Disadvantages:

• More complex process compared to gray iron casting.
• Higher material costs due to the use of magnesium.