Ductile Iron Castings
High-strength ductile iron castings from 0.5 kg to 650 kg
What is Ductile Iron?
Ductile Iron (Spheroidal Graphite Iron, formerly known as SG Iron), also called nodular cast iron, is a type of cast iron where the graphite is present in the form of spherical nodules rather than flakes. This microstructure gives ductile iron significantly higher tensile strength, ductility, and impact resistance compared to grey iron.
At Sri Gnanamurugan Foundry, we manufacture ductile iron castings across a comprehensive range of grades from Ductile 400/15 to Ductile 800/2, engineered to meet the demanding requirements of modern industrial applications.
Ductile Iron Grades We Manufacture
We produce castings across the full spectrum of ductile iron grades to match your application requirements.
Key Properties of Ductile Iron
High Tensile Strength
Superior load-bearing capacity compared to grey iron, ideal for structural and heavy-duty components.
Ductility & Impact Resistance
Graphite nodules provide flexibility and shock absorption for dynamic applications.
Wear Resistance
Excellent resistance to wear and fatigue, extending component lifespan in demanding environments.
Good Machinability
Easier to machine than steel while maintaining superior mechanical properties.
Manufacturing Process
Induction Melting
Dura-Line® Inductotherm furnace for precise temperature and composition control.
Nodularization
Magnesium treatment process to transform graphite into spheroidal nodules.
Moulding
ARPA green sand moulding and CO₂ process for complex geometries.
Pouring & Solidification
Controlled pouring temperatures for optimal microstructure formation.
Fettling & Finishing
Shot blasting, grinding, and surface finishing to specification.
Quality Testing
Spectrometer analysis, mechanical testing, and microstructure verification.
Industrial Applications
Automotive
Crankshafts, connecting rods, steering knuckles, and suspension components.
Pumps & Valves
Pump housings, impellers, valve bodies for high-pressure systems.
Construction
Heavy machinery parts, crane components, and structural fittings.
Agriculture
Tractor parts, harvester components, and tillage equipment castings.
Mining & Crushing
Crusher jaws, liners, and wear-resistant mining equipment parts.
General Engineering
Custom ductile iron components for diverse industrial requirements.
Need Ductile Iron Castings?
Get a custom quotation for your ductile iron casting requirements. Our team is ready to discuss your specifications.
Request a QuoteFrequently Asked Questions
What is the difference between ductile iron and grey iron?
In ductile iron the graphite forms spheroidal nodules rather than the flakes found in grey iron. This gives substantially higher tensile strength, ductility and impact resistance, so ductile iron is chosen where a part must withstand shock loading or higher stress. Grey iron remains preferable where damping and machinability matter more.
Is ductile iron the same as SG iron?
Yes. Ductile iron, SG iron (spheroidal graphite iron) and nodular iron all refer to the same material. The names describe the nodular graphite structure that gives the metal its strength and ductility.
What weight range of ductile iron castings can you supply?
Ductile iron castings are produced from 0.5 kg to 650 kg per piece, using the same melting, moulding and finishing facilities as our grey iron production.
Which applications is ductile iron suited to?
Ductile iron is used where higher strength and toughness are required — automotive and heavy vehicle components, pump and valve bodies, construction and agricultural machinery parts, and general engineering components subject to stress or impact.
How is the quality of ductile iron castings verified?
Each batch is checked by spectrometer analysis, Rockwell hardness testing and tensile testing on a universal testing machine, with graphite nodularity assessed on an optical microscope with image analyser. The foundry operates an ISO 9001:2015 certified quality system.