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

valves
Planet carrier
Ductile Iron Impellers
Impellers
Flanges
gearbox-housing
Gearbox housing
Bearing Housing
Bearing housing
Brackets
Pivot Block
Pivot Block

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

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

metal pouring

Melting & Alloying

Medium-frequency induction furnaces with precise chemical control.

Molding-Sand

Molding

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

machining

Machining

CNC machining centers for precision finishing and complex geometries.

Heat-Treatment

Heat Treatment

Controlled annealing and normalizing for tailored mechanical properties.

inspection

Inspection & Testing

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

casting products

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.

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