Jiangsu Shengrong Casting Factory specializes in the production of ductile iron. We produce various grades ranging from QT400 to QT700, from1 kg to10 tons, with custom sizes available.tensile strengths of 400-900 MPa. Excellent ductility and toughness,elongation typically ranges from 5-25%, high fatigue strength, excellent wear resistance, and shock absorption. Small order acceptable. Fast delivery within 40 days for new project
Casting size can be up to CT8, surface no defects,roughness is better, mechanical properties are good, casting parts are wear-resistant and has a long service life
Conform to the drawing requirements, avoiding excessive machining allowances or dimensional deviations.
Exempt from deformation or warping, with clear contours and complete features (such as holes, slots, and threads).
Fit well with assembly components, eliminating interference.
Smoothness: Surface roughness meets standards (e.g., no sand buildup, scarring, burrs, etc.).
Defect Control: No surface defects such as cracks, cold shuts, shrinkage cavities, air holes, or slag inclusions.
Coating/Treatment Suitability: The surface is suitable for subsequent treatments such as spraying and electroplating.
Density: No shrinkage, shrinkage cavities, or air holes (can be detected by X-ray or ultrasonic testing).
Metallurgical structure: Fine and uniform grains, free of segregation and inclusions, meeting material requirements (e.g., spheroidization rate for ductile iron).
Mechanical properties: Strength, hardness, and toughness meet standards (e.g., tensile strength and elongation).
Chemical Composition: Accurate alloy composition (e.g., carbon, silicon, manganese, and other element content).
Mechanical Properties: Verified by tensile and impact tests (e.g., HT250 cast iron has a tensile strength of ≥250 MPa).
Corrosion/Wear Resistance: Meets specialized operating requirements (e.g., acid and alkali resistance, high-temperature oxidation resistance).
Gating system design: No under-gating, cold shuts, and clean riser removal.
Residual Stress: Annealing or aging treatments are performed to reduce deformation or cracking caused by internal stress.
Nondestructive Testing: Passes penetrant testing (PT), magnetic particle testing (MT), or radiographic testing (RT).
Sealing: No leakage in pressure-bearing castings (e.g., valve bodies, pump casings).
Fatigue Life: No premature failure under dynamic loads (e.g., automotive parts).
Machinability: No hard spots or abnormal tool wear during subsequent cutting operations.
Ductile iron (also known as ductile cast iron or spheroidal graphite cast iron) has excellent mechanical properties, good castability and cost advantages. It is used in engine parts, chassis parts, steering knuckles, brake calipers, suspension parts (good impact resistance), transmission systems, valves and pipe fittings, gears and pulleys, hydraulic components, pump housings, valve bodies
More than 10 years of customized casting experience, stable casting process quality, professional casting engineer team, good worker training system, complete quality inspection equipment and good after-sales service. Send us the detailed drawing for quotation
Contact us today for a quote or more information.
Precisely Matching Your Project Requirements
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Ductile /Nodular Cast Iron Material Grades |
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| 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 |
| China | GB 1348 | QT400-18 | QT450-10 | QT500-7 | QT600-3 | QT700-2 | QT800-2 |
| USA | ASTM A536 | 60-40-18 | 60-42-10 | 70-50-05 | 80-55-06 | 100-70-03 | 120-90-02 |
| Germany | DIN 1693 | GGG40 | — | GGG50 | GGG60 | GGG70 | GGG80 |
| 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 |
| 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 |
| 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 |
| 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 |
Ductile Iron Mechanical Properties
| Ductile Iron Grade in GB1348 Ductile Iron Castings | ||||
| Iron Grade | Wall Thickness | Tensile Strength(Min Mpa) | Yield Strength(Min Mpa) | elongation |
| /mm | % Min | |||
| QT400-18A | >30~60 | 390 | 250 | 18 |
| >60~200 | 370 | 240 | 12 | |
| QT400-15A | >30~60 | 390 | 250 | 15 |
| >60~200 | 370 | 240 | 12 | |
| QT500-7A | >30~60 | 450 | 300 | 7 |
| >60~200 | 420 | 290 | 5 | |
| QT600-3A | >30~60 | 600 | 360 | 3 |
| >60~200 | 550 | 430 | 1 | |
| QT700-2A | >30~60 | 700 | 400 | 2 |
| >60~200 | 650 | 380 | 1 | |
Advanced Equipment for High-Quality Ductile Cast Iron Manufacturing
Cast Star Horizontal Molding Line/Microcrystalline automatic pouring machine/New Donger Molding Machine/Sand mixing system and sand separator/Coremaking machine/40T automatic sand treatment line/1T intermediate frequency furnace 3 sets
We have 1set 1005 horizontal machining center, 6sets 630 horizontal machining centers, 1set 500 horizontal machining center, 7sets 850 vertical machining centers, 3sets 1160 vertical machining centers, and 1set CMM Main Machining: robot joints, reducer boxes, aluminum alloy high-voltage housings, textile machinery accessories, etc.
2 spectrometers, 2universal material testing machines, C-S analyzer, Si-Mn-P high-speed analyzer, 2 metallographic microscopes, 2 Brinell hardness meters, impact testing machines, molding sand permeability detectors, and an independent physical and chemical testing
Casting Inspection
1.Visual Inspections
2.Dimensional Inspections
3.Chemical Inspections
4.Mechanical Properties Inspections
We have materials R&D center,In line with the CAD and UG three-dimensional mold creation capabilities equipped with independent R&D
1. Design Stage Control
Rational structural design: Avoid sudden changes in wall thickness and sharp corners, and use rounded corner transitions to reduce stress concentration.
Processability Review: Ensure that the casting design meets casting process requirements (e.g., draft angle, shrinkage allowance).
2. Raw Material Control
Metal materials: Strictly control chemical composition (e.g., carbon equivalent, impurities) to ensure the purity of the smelted material.
Smelting Process: Control the melting temperature and deoxidize and degas (e.g., use argon refining) to avoid inclusions and residual gases.
3. Process Control
Mold/Mold Shell Quality: Ensure mold accuracy and surface finish, and uniform sand compaction.
Gating System Design: Properly arrange the gate, riser, and chiller to ensure sequential or simultaneous solidification.
Gating Temperature (too high can cause sand sticking, too low can cause cold shutoff).
Gating Speed (avoid turbulence that causes air entrainment).
Cooling Rate (control grain size and microstructure uniformity). Special Processes: Advanced processes such as low-pressure casting and lost foam casting are used for complex parts.
4. Production Process Monitoring Real-time Testing: Thermocouples are used to monitor the melting temperature, and spectrometers are used for rapid composition analysis.
Environmental Control: Humidity and temperature affect the properties of the molding sand and must be maintained stable.
Operational Specifications: Standardized operations are implemented (e.g., cleaning loose sand before assembly and ensuring proper heat preservation after pouring).
5. Inspection and Defect Analysis
X-ray/ultrasonic testing for internal defects (porosity, shrinkage).
Penetrant testing for surface cracks.
Destructive Testing: Mechanical testing (tensile strength, hardness) and metallographic analysis are performed on random samples.
Defect Traceability: A defect classification database (e.g., slag inclusions, pinholes) is established to analyze the root causes and provide feedback for improvements.
Our Commitment To Quality, Safety & Sustainability
We can customize various grades of ductile iron and gray iron castings and provide machining services. We offer stable casting quality, competitive prices, and short delivery times. We also offer half the mold fee and free samples for new projects.
High-quality ductile iron parts with precise dimensions and good surface finish
We no requirem MOQ and for new project, the lead time with mold no more than 40 days
The competitve casting parts in china, the more oreder, the better price.
If casting parts defects more than 5%, we will send you new one free of charge
Gray iron castings are manufactured very easily and have good machinability.They are typically used in the following applications where strength is important, but not the main required property:
We make the parts from 0.5kgs to 10000kgs, special size is available
For samples, it need about 30days(model develop time 15-20 days, samples production time 10 days)
Bulk order after mold finished, it need about 20 days
Our yearly production can reach to 4000 tons
Yes, please offer detailed 2D drawing
We promise the QC pass rate 95%, if lower than this, we will send you new part free of charge
Gray cast iron is a broad term used for a number of cast irons whose microstructures are characterized by the presence of flake graphite in the ferrous matrix. Such castings often contain 2.5% to 4% carbon, 1% to 3% silicon, and some additions of manganese ranging from 0.1% to 1.2%.
Normally, grey iron will be cheaper than ductile iron, and ductile iron will be cheaper than malleable iron. As for the same type of cast iron, the low and middle grades will have the same prices, but high grades will cause higher production costs.
| Physical Properties | Metric | English |
|---|---|---|
| Hardness, Rockwell C | 20 | 20 |
| Hardness, Vickers | 246 | 246 |
| Tensile Strength, Ultimate | >= 276 MPa | >= 40000 psi |
| Ultimate Compressive Strength | >= 1034 MPa | >= 150000 psi |
The biggest disadvantage of gray cast iron is its low tensile strength. This results from the graphite flakes within the material – which also give it many of its benefits.
Class 25,30,35,40 tensile and heat resistant irons. Gray Iron has a dense gray structure and offers excellent machinability. Grades 25, 30, 35 and 40 can fill specific requirements for hardness and wear, and heat treatments can yield even higher mechanical properties.
The defect appears preferably on horizontal or convex surfaces and at the surface of parts of reduced thickness having solidified at high cooling rates. In grey cast irons with high carbon contents, the defect can be formed in thick sections in which C-type graphite (hypoeutectic alloys) is commonly present.
Like gray cast iron, white cast iron features many small fractures. The difference is that white cast iron features cementite below its surface, whereas gray cast iron features graphite below its surface. The graphite creates the appearance of a gray color, while the cementite creates the appearance of a white color.
The more carbon present in a material, the more brittle it is. Grey cast iron is further impacted by its graphical microstructure. It has tiny cracks and graphite flakes inherent within the material and these also contribute to its brittleness.
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