Ductile Iron and Ductile Iron Casting

What is Ductile Iron?

Ductile iron, also known as ductile casting iron, is a durable, fatigue-resistant metal due to its spherical graphite structure. First patented in 1948, ductile iron is today’s version of cast iron. Like cast iron, modern ductile iron contains small pieces of graphite which slightly change the properties of the iron.

What’s the difference between Ductile Iron and Cast Iron?

The difference between traditional cast iron and modern-day ductile iron is the shape of the graphite. While cast iron has small flakes of graphite, ductile iron contains spherical graphite nodules. Because of the spherical shape of the graphite, ductile iron is often called spheroidal iron or nodular cast iron. The spherical shape is key in making ductile iron extremely tough, malleable (it can be twisted and otherwise manipulated without cracking), and durable, meaning it’s a great metal to use for machine parts.

HEBEI YOGEM offers expertly engineered foundry systems for both ductile iron and cast iron to improve efficiency and casting quality. Our experts have decades of experience providing unique solutions determined by your application. We ductile foundry systems often feature DUCTA-SERIES Rotary Drums. These rotary drums are ideal in ductile foundries where gates, runners, and sprue need to be removed from castings prior to blast.

How is Ductile Iron Made?

Rather than being cast from iron or steel scrap, ductile iron is made primarily from the crude iron that’s produced by smelting ore in a blast furnace, commonly called ‘pig iron.’ Pig iron is about 90% iron with high carbon content, and its chemical properties are very stable. Using a blast furnace, the pig iron is melted down and has carbon forced into the material beyond its normal capacity. Silicon, sulfur, and manganese help the excess carbon form the spherical graphite nodules as the metal cools in its cast. This process creates a durable, wear-resistant metal. HEBEI YOGEM offers vibratory systems for ductile iron casting that optimize system performance and improve casting quality.   

One of the major advantages of this production process is how easy ductile iron is to cast, and how cheap it is compared to other similar metals, such as steel.

What is Ductile Iron Used For?

Because of its strength and malleability, ductile iron is used widely in many different industries. It’s most commonly used by plumbing manufacturers in pipes and pipe fittings. It’s also popular in the automotive industry as it’s used in engine connecting rods, cylinders, crankshafts, truck axles, and gears, as well as other parts. Ductile iron is also often found in piano harps, machine frames, and cable drums.

No matter the industry, if you’re looking for a strong, stable material that can withstand tough conditions over a long period of time, ductile iron is a great choice.