Ductile Iron Casting

Ductile iron casting, also known as nodular or spheroidal graphite iron casting, is a manufacturing process that produces components using ductile iron, a type of cast iron with enhanced mechanical properties. Unlike grey iron, ductile iron features graphite in a spherical (nodular) form, achieved by adding magnesium or cerium to the molten iron before casting. This unique microstructure gives ductile iron its high strength, ductility, and impact resistance, making it a preferred material in demanding applications.

We provide high-quality ductile iron castings (also known as nodular cast iron or spheroidal graphite iron) for global industries. Our expertise covers precision casting, machining, testing, and assembly, ensuring durable and high-performance parts for construction, automotive, mining, and energy sectors. With advanced facilities and strict quality control, we are a trusted partner for both standard and customized ductile iron components.

Key Characteristics:
Product Range

High Strength Comparable to Steel – Tensile strength up to 800 MPa.
Excellent Ductility and Toughness – Withstand impact and vibration without brittle failure.
Superior Fatigue Resistance – Reliable for rotating and load-bearing applications.
Good Corrosion Resistance – Suitable for outdoor and underground applications.
Cost-Effective – Lower cost than steel forging with similar mechanical performance.
Versatility – Easily cast into complex shapes with accurate dimensions.

Content:

Pipe Fittings & Flanges – High strength and corrosion resistance for water and gas systems.
Automotive Components – Engine blocks, crankshafts, differential cases with excellent fatigue resistance.
Construction Machinery Parts – Axle housings, brackets, frames, designed for heavy-duty loads.
Hydraulic & Pump Components – Pump bodies, impellers, valve housings, reliable under high pressure.
Industrial Equipment Castings – Gear wheels, bearing seats, machine tool parts.
Customized Components – According to drawings and material specifications.

Case Studies

Content:

Grades: EN-GJS-400-15, EN-GJS-500-7, EN-GJS-600-3, EN-GJS-700-2
Tensile Strength: 400–700 MPa
Elongation: 2–15% depending on grade
Hardness (HB): 130–250
Impact Strength: Excellent even at low temperatures
Fatigue Resistance: Higher than gray iron and many steels

Ductile /Nodular Cast Iron Material Grades
Country	Standard	Equivalent Grades of Ductile iron (SG Iron, Nodular Graphite Iron)
ISO	ISO 1083	400-15	450-10	500-7	600-3	700-2	800-2	900-2
		400-18
China	GB 1348	QT400-18	QT450-10	QT500-7	QT600-3	QT700-2	QT800-2	QT900-2
USA	ASTM A536	60-40-18	60-42-10	70-50-05	80-55-06	100-70-03	120-90-02	–
			65-45-12		80-60-03
Germany	DIN 1693	GGG40	–	GGG50	GGG60	GGG70	GGG80	–
Austria
European	EN 1563	EN-GJS-400-15	EN-GJS-450-10	EN-GJS-500-7	EN-GJS-600-3	EN-GJS-700-2	EN-GJS-800-2	EN-GJS-900-2
		EN-GJS-400-18
Japan	JIS G5502	FCD400	FCD450	FCD500	FCD600	FCD700	FCD800	–
Italy	UNI 4544	GS370-17	GS400-12	GS500-7	GS600-2	GS700-2	GS800-2	–
France	NF A32-201	FGS370-17	FGS400-12	FGS500-7	FGS600-2	FGS700-2	FGS800-2	–
UK	BS 2789	400/17	420/12	500/7	600/7	700/2	800/2	900/2
India	IS 1865	SG370/17	SG400/12	SG500/7	SG600/3	SG700/2	SG800/2	–
Spain	UNF	FGE38-17	FGE42-12	FGE50-7	FGE60-2	FGE70-2	FGE80-2	–
Belgium	NBN 830-02	FNG38-17	FNG42-12	FNG50-7	FNG60-2	FNG70-2	FNG80-2	–
Australia	AS 1831	300-17	–	500-7	600-3	700-2	800-2	–
		400-12
Sweden	SS 14 07	0717-02	–	0727-02	0732-03	0737-01	0864-03	–
Norway	NS11 301	SJK-400.3	–	SJK-500	SJK-600	SJK-700	SJK-800	–
		SJK-400						–

Capabilities & Facilities

Melting & Alloying

Medium-frequency induction furnaces with precise chemical control.

Molding

Green sand, resin sand, and shell molding suitable for small and large castings.

Machining

CNC machining centers for precision finishing and complex geometries.

Heat Treatment

Controlled annealing and normalizing for tailored mechanical properties.

Inspection & Testing

Spectrometer, CMM, tensile testing, hardness testing, and ultrasonic flaw detection.

Annual Output

Thousands of tons of ductile iron castings for domestic and international markets.

Quality Assurance

Content:

ISO 9001 certified production management system.
100% chemical composition and mechanical property testing per batch.
Dimensional accuracy checked with CMM.
Support for third-party inspection (SGS, BV, TÜV).
Full traceability from raw materials to finished castings.

Applications

Content:

Automotive Industry – Crankshafts, gears, and brake components.
Pipeline Systems – Pressure pipes, fittings, and water treatment systems.
Construction Machinery – Axle housings, couplings, and structural parts.
Mining & Heavy Industry – Crusher plates, bearing seats, wear-resistant parts.
Agricultural Equipment – Transmission housings and brackets.

Let’s Build Your Next Great Component

Contact Us

Whether you have a complete CAD model or are in the early stages of design, we can provide expert guidance on material selection, process optimization, and design for manufacturability to ensure your project’s success.

Ductile Iron Casting