Ductile iron casting
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:
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.
Product Range
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
Mechanical character
Technical Specifications
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 | GGG70 | GGG80 | – | |
Austria | ||||||||
European | EN 1563 | EN-GJS-400-15 | EN-GJS-450-10 | EN-GJS-600-3 | EN-GJS-900-2 | |||
EN-GJS-400-18 | ||||||||
Japan | JIS G5502 | 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.
