IRON CASTING SERVICES
High-Quality Custom & OEM Iron Castings
Located in China, SIMIS is a leading manufacturer providing high-quality custom and OEM iron casting services. We maintain two specialized iron casting facilities—a shell mold casting foundry and a sand casting foundry—each equipped with advanced capabilities for tooling, casting, machining, heat treatment, surface treatment, and comprehensive quality testing. This dual-foundry approach maximizes our versatility, allowing us to balance the critical factors of cost, scale, and dimensional accuracy to meet diverse client needs.
Our iron casting services encompass the entire production value chain, from tool making and casting through heat treatment, high-precision machining, surface finishing, assembly, and strict quality control. Our engineering teams specialize in customization, ensuring precise compliance with challenging requirements, including complex geometries and tight tolerances. Our material expertise covers hundreds of iron grades, including ductile, gray, white, and malleable cast iron, with capacity for both common industry grades and customer-specified materials.
What is Iron Casting?
The iron casting process involves pouring molten iron into a mold where it solidifies into a final shape. This technique produces complex, robust parts used in commercial and industrial applications. Common methods include sand casting, shell mold casting, and lost foam casting, selected based on component volume, surface finish, and complexity.
Cast iron is a versatile ferrous alloy distinguished by its high carbon content (over 2.11%). The final properties of the material are determined by how this carbon is configured structurally, leading to distinct material types: ductile iron, gray iron, white iron, and malleable iron.
Iron casting material versatility provides reliable mechanical properties, including high compressive strength, excellent wear characteristics, and cost-effectiveness. The iron grade is chosen to meet required rigidity, toughness, and performance, ensuring the component aligns with its operating environment.
Our Iron Casting Processes
SIMIS produces iron castings via two main processes: shell mold casting and sand casting. The unique characteristics and advantages of each technique enable us to meet all client specifications related to geometry, size, complexity, finish, and tolerance. We work with our customers to assess their needs for cost-efficiency, lead time, and production volume to recommend the most optimal casting method and guarantee the best possible outcome.
Shell Mold Casting
Shell mold casting is our choice for cast iron parts when precision needs to be balanced with economy. By forming a rigid, thin shell mold (using resin-bonded sand), this process consistently achieves a superior surface finish and closer tolerances, providing a quality upgrade from standard sand casting.
Sand Casting
We rely on sand casting as the most efficient and flexible technique for manufacturing large, heavy iron components with straightforward geometries. This process uses custom sand molds and is the best choice for achieving cost-efficiency, high volume, and versatility across different cast iron grades.
Advantages of Iron Casting
Iron casting is an effective manufacturing choice for industrial components, offering advantages over standard metal fabrication. The process delivers structural integrity, design flexibility, and cost savings. Cast iron provides high compressive strength and rigidity for demanding applications, along with superior dampening and wear resistance. Because of its castability, we produce intricate designs efficiently, providing a product with high cost-to-value.
Exceptional Castability and Design Freedom
Cast iron, especially gray iron, exhibits superb fluidity when molten, allowing it to fill complex mold cavities easily. The great castability leads to exceptional design freedom, resulting in intricate shapes, complex internal structures, and components with varying wall thicknesses that would be difficult or impossible to produce with other methods such as welding or metal fabrication.
High Compressive Strength and Rigidity
Cast iron offers significantly higher compressive strength than most cast steels, a unique benefit that makes cast iron ideal for components subjected to heavy loads or compression (like machine bases and engine blocks). Its high rigidity also guarantees minimal deformation under stress, providing excellent stability for critical components.
Superior Dampening Capacity
Gray iron, the most common cast iron type, has an internal microstructure (graphite flakes) that gives it a superior ability to dampen vibration and absorb noise. This property is vital for machine tool bases, brake drums, and other equipment where minimizing vibration is crucial for accuracy and service life.
Excellent Wear Resistance
Certain types of cast iron, such as white iron and ductile iron, offer excellent resistance to wear, abrasion, and galling. This is due to the presence of hard microconstituents (like cementite) or the combination of strong matrix structures with carbon inclusions, making them durable for components like pump housings, gears, and rollers.
Cost-Effectiveness and Material Availability
Iron casting is generally one of the most cost-effective methods for producing high-volume, near-net-shape metal parts. The raw materials are abundant, the melting temperatures are relatively low compared to steel, and the casting process minimizes the need for extensive secondary machining, leading to significant material and manufacturing cost savings.
Common Iron Casting Grades
The performance of your final component hinges entirely on selecting the right iron grade. The unique microstructures of Gray, Ductile, and specialty irons determine everything from vibration dampening and tensile strength to surface hardness and fatigue life. Our material specialists are experts in the intricacies of every major global specification (GB, EN, ASTM). Review the detailed grades in the table below to compare the capabilities of each material, and consult with our engineering team to precisely match a grade to your application’s rigorous demands.
HT150 / EN-GJL-150 / Class 25
Key Properties
This gray cast iron offers excellent thermal conductivity and superior vibration damping. It has good machinability and is commonly used for light-duty, non-critical parts.
Typical Applications
It is commonly used for manhole covers, counterweights, lower-stress machinery bases, and general machine tool components.
HT250 / EN-GJL-250 / Class 40
Key Properties
HT250 gray cast iron provides a good balance of strength and wear resistance while maintaining excellent damping capacity. This is one of the most widely used general-purpose grades.
Typical Applications
This grade is commonly used for producing cylinder blocks, brake drums, high-stress gearbox housings, and machine frames.
HT300 / EN-GJL-300 / Class 45
Key Properties
This gray cast iron features higher tensile strength and better wear resistance than HT250, making it suitable for components under moderate thermal or mechanical stress.
Typical Applications
It is used to produce parts such as heavy-duty engine components, hydraulic valves, pump bodies, and pistons.
HT350 / EN-GJL-350 / Class 50
Key Properties
This gray cast iron is the highest strength grade, used where maximum rigidity and wear resistance are needed, often in heavy-duty machinery, supporting heavy loads and resisting mechanical stress.
Typical Applications
The common applications of this grade include heavy machine tool bases, large industrial gears, and heavy compression parts.
QT400-18 / EN-GJS-400-18 / 60-40-18
Key Properties
This ductile cast iron is known for its high ductility and superior toughness due to its ferrite microstructure, providing excellent impact resistance, moderate strength, machinability, and weldability.
Typical Applications
Applications include automobile suspension parts, fittings, valves, and components requiring bending or impact resistance.
QT500-7 / EN-GJS-500-7 / 80-55-06
Key Properties
This ductile cast iron is a balanced grade with high tensile strength and good ductility, making it ideal for general engineering applications that require a combination of strength and toughness.
Typical Applications
It is typically used for crankshafts, rollers, gearboxes, wind turbine hubs, and heavy machinery parts.
QT700-2 / EN-GJS-700-2 / 100-70-03
Key Properties
This ductile cast iron is a high-strength, low-ductility grade often achieved through heat treatment (normalizing), used when maximum strength and wear resistance are required.
Typical Applications
Key applications are high-stress gears, agricultural machinery parts, and heavy-duty axle components.
EN-GJS-1300-3 / 200-155-02
Key Properties
This Austempered Ductile Iron (ADI) is an extremely high-strength grade, offering maximum hardness and wear resistance, making it suitable for components subjected to high-contact stress and sliding abrasion.
Typical Applications
Typical applications of this grade are high-load gears and pinions, heavy-duty track rollers, excavator teeth, and parts used in severe abrasive environments.
EN-GJS-1400-1 / 160-120-01
Key Properties
This Austempered Ductile Iron (ADI) is an ultra-high-strength grade, providing maximum tensile strength and fatigue properties, comparable to forged steel, ideal for extreme loads and wear
Typical Applications
It is suitable for mining and earth-moving equipment, high-performance gears, heavy-duty suspension, and parts requiring high contact stress resistance.
KmTBCr15 / EN-GJN-HV600 / A532 Class III-A
Key Properties
This high-chrome white iron contains about 15% chromium, providing exceptional resistance to both abrasion and low-stress impact wear, corrosion, heat, friction, and erosion.
Typical Applications
It is used mainly for Slurry pump impellers, chute liners, medium-duty grinding balls, and dredge pump parts.
Ni-Resist Type 1 / EN-GJLA-XNiCuCr15-6-2 / A436 Type 1
Key Properties
This Ni-Resist iron features a high nickel content (up to 20%), yielding a stable austenitic structure that provides excellent corrosion resistance and good thermal stability across a wide temperature range.
Typical Applications
It is frequently used for chemical pump casings, valve bodies for salt water or alkaline environments, and exhaust manifolds.
Ni-Resist Type 3 / EN-GJLA-XNiCr30-3 / A436 Type 3
Key Properties
This Ni-Resist iron, with higher nickel (up to 30%) and chromium content, offers superior corrosion resistance in more aggressive chemical environments, alongside excellent heat resistance.
Typical Applications
This grade is typically used for furnace parts, high-temperature pump impellers, specialized chemical processing equipment, and parts requiring low thermal expansion.
Surface Treatment Options for Iron Castings
Achieving the performance potential of iron castings requires selecting the correct surface treatment. A component’s longevity and aesthetics are governed by the finishing process applied after casting and cleaning. Our foundry supports your project with finishing expertise, providing solutions ranging from organic coatings and chemical treatments to metallic plating to protect parts against corrosion and wear. To select the most cost-effective finish for your application, examine our options below and reach out to our team for guidance.
Powder Coating
Powder coating is a high-performance finishing method that creates a thermally cured, cohesive shield over the iron casting. This finish is far more chip-resistant than traditional liquid paint, providing a heavy-duty layer that guards the underlying cast iron component against rust and surface abrasion.
Electrocoating
The E-coating process applies paint electrophoretically while the iron casting is fully immersed in a bath. This method guarantees uniform coverage across intricate and recessed internal geometries, providing comprehensive corrosion resistance for even the most complex component designs.
Painting
Painting is a versatile, economical finishing method for iron castings, especially suitable for large-scale components. It provides an effective corrosion barrier while enhancing the part’s final appearance, serving as a practical alternative to more intensive processes.
Black Oxidizing
The black oxidizing treatment transforms the iron's surface into a protective magnetite film. It produces a sleek, non-glare black appearance and light corrosion shielding. Crucially, the process preserves critical tolerances because it involves no material buildup or dimensional distortion.
Electroplating
Through an electrolytic bath, the electroplating process bonds a metallic layer—such as zinc or chrome—to the iron casting. It significantly boosts surface hardness and wear resistance while providing a brilliant finish, all without compromising the part’s tight dimensional tolerances.
Hot-Dip Galvanizing
By submerging the iron casting in molten zinc, hot-dip galvanizing creates a rugged metallurgical bond. The resulting zinc-iron alloy layers provide unmatched, long-term defense against rust, making it the premier choice for components facing extreme outdoor or industrial environments.
Applications and Industries Benefit From Iron Casting
When project specifications demand exceptional vibration damping and high-cycle fatigue resistance, iron casting becomes a very useful manufacturing choice. By using the unique graphite structures of gray iron and ductile iron, these components excel at absorbing mechanical noise and resisting surface galling in high-friction environments. This inherent reliability is indispensable for the automotive, municipal waterworks, and power generation sectors, ensuring long-term performance for critical components in heavy machinery, railway infrastructure, and agricultural systems.
Agricultural Machinery Castings
In agricultural machinery, iron castings are used for components that must withstand heavy soil abrasion and high structural loads. The natural wear resistance and ability to be cast into complex, weight-optimized shapes make iron a cost-effective alternative to multi-part steel fabrications.
Commonly produced items include generator end covers, transmission housings, axle supports, furrow openers, and wheel weights. For these applications, HT250 gray iron is frequently used for engine blocks and pulleys due to its excellent machinability and damping properties, which are required for high-performance agricultural systems.
QT450-10 ductile iron is specified for steering knuckles and brackets that require impact toughness, while EN-GJS-1050-6 (ADI) is the preferred grade for high-wear ground-engaging tools like plow points and harvester teeth.
Railway Parts
The railway industry requires components that handle constant vibration and mechanical wear. Iron castings are the preferred choice for this sector because they offer excellent damping capacity and high compressive strength. Using gray and ductile iron allows for the production of single, complex parts that absorb operational noise and resist surface friction more effectively than welded steel assemblies.
Typical cast parts include brake discs, axle housings, and shock absorber brackets for rolling stock, as well as infrastructure components like rail point machines and signaling equipment that support the global railway industry with high reliability.
Common specifications include HT250 gray iron for thermal conductivity in brake systems, QT500-7 ductile iron for structural brackets, and EN-GJS-1200-2 (ADI) for heavy-wear gears and rollers requiring maximum fatigue resistance.
Pump and Valve Components
In the pump and valve industry, iron castings provide superior castability and pressure-tight integrity. The ability to form smooth internal flow paths and resist cavitation wear makes iron ideal for municipal water, chemical, and oil and gas applications. Compared to steel, cast iron offers better corrosion resistance and high damping capacity, reducing noise and vibration in high-pressure systems.
Typical components include pump casings, impellers, valve bodies, and mounting brackets. For these parts, HT250 is commonly used for standard pump housings due to its excellent machinability and pressure-containing capabilities.
For high-pressure or safety-critical valves, QT450-10 is specified for its superior ductility and impact strength, while QT800-2 or ADI grades are utilized for impellers and components requiring high hardness and resistance to abrasive fluid wear.
Mining & Construction Castings
The mining and construction industries demand materials capable of withstanding extreme abrasive wear and high-impact structural loading. Iron castings are favored in these sectors for their exceptional hardness and ability to be cast into massive, thick-walled components that resist deformation.
Typical components include crusher liners, excavator buckets, track shoes, and heavy-duty gearboxes used in mining and construction, along with rock drill housings, hydraulic cylinder mounts and grader blades. For these applications, HT300 is often used for large stationary frames where mass and vibration damping are required.
For components subjected to dynamic stress and impact, QT600-3 provides essential toughness, while QTD1400 (ADI) is the premier choice for ground-engaging tools and wear plates that require maximum surface hardness and resistance to abrasive gouging.
Automotive Casting Parts
The automotive industry uses iron castings for powertrain and chassis components that endure high thermal stress and mechanical friction. Cast iron is suited for these applications because it conducts heat well and dampens engine harmonics, resulting in quieter vehicle operation. Superior machinability also allows for high-volume production of complex parts with tight tolerances, making it more efficient than forged steel for engine and drivetrain assemblies.
Commonly manufactured items include crankcases, cylinder heads, crankshafts, camshafts, and differential cases. For these applications, HT300 is the standard for cylinder heads and engine blocks due to its high thermal fatigue resistance and dimensional stability.
QT700-2 is frequently specified for crankshafts to provide high tensile strength and fatigue life, while QTD1200 (ADI) is used for high-performance differential gears and suspension components that require extreme hardness and wear resistance.
Infrastructure and Manicipal Castings
In the infrastructure and municipal sector, iron castings are the primary choice for components that must support heavy traffic loads and resist environmental corrosion. The material’s high compressive strength and long-term durability allow it to remain functional for decades, even when buried or exposed to the elements.
Typical infrastructure items include manhole covers, drainage grates, water meter boxes, fire hydrants, and street lighting bases. For these applications, HT200 is often used for non-load-bearing decorative elements and municipal furniture due to its excellent surface detail and ability to resist corrosion.
For heavy-duty load-bearing components like roadway covers and grates, QT500-7 is the industry standard, providing the necessary high-impact toughness and elongation to prevent brittle failure under heavy vehicle passage.
Hyraulic and Fluid Power Castings
In the fluid power industry, iron castings are used for valve bodies and manifolds that operate under extreme internal pressures. Iron is selected for these components because of its pressure tightness and ability to form intricate internal galleries difficult to machine. Additionally, iron’s natural wear resistance allows moving parts like spools and plungers to maintain a precise fit over millions of cycles.
Typical components include directional control valve bodies, hydraulic manifolds, piston pump cylinders, and actuator end caps. For standard low-pressure hydraulic housings, HT250 or HT300 gray iron is used for its superior machinability and dimensional stability.
For high-pressure applications (often exceeding 250 bar), QT450-10 or QT500-7 ductile iron is the industry standard due to its high tensile strength and ability to resist fatigue from pressure pulsing, while ADI grades are used for high-wear pump internal components.
Engineering Machinery Components
General industrial machinery relies on iron castings for structural frames and rotating components that must maintain precision under heavy loads. Iron’s primary advantage in this sector is its exceptional “stiffness-to-cost” ratio and its natural ability to dampen the vibrations generated by high-speed motors and gears.
Commonly produced components include machinery frames, machine tool beds, flywheels, gear housings, and heavy-duty pulleys. For large structural bases where vibration absorption and flatness are critical, HT200 or HT250 is the preferred material.
For rotating parts like flywheels or housings subjected to internal pressure, QT500-7 provides the necessary balance of strength and toughness, while QTD1050 (ADI) is selected for high-torque gears and rollers that require maximum surface hardness and resistance to fatigue under extreme heavy-duty loading conditions.
Why Choose SIMIS For Iron Casting Services?
Taiyuan SIMIS is a premier integrated foundry in China specializing in custom iron castings engineered through advanced casting technologies. By managing the entire production cycle in-house—from precision pattern making to final surface treatment—we streamline your supply chain and ensure every component meets rigorous quality standards. Our comprehensive approach allows us to deliver high-performance, ready-to-install iron parts with exceptional dimensional accuracy and a significant cost advantage for our global partners.
Quality Assured
Our iron castings are 100% inspected and fully traceable. We provide all necessary reports detailing chemical analysis and metallurgical results.
High Production Capacity
Our foundry manages an iron casting output of 5,000+ tons yearly. This massive scale ensures highly competitive pricing and significantly faster turnaround times for clients.
Advanced Equipment
Our plants merge robotic automation with technical molding using modern hardware. Production is carried on via high-end foundry simulation software.
Material Expertise
We produce iron castings in various common and custom grades. Our expertise spans numerous global specifications, such as ASTM, GB, DIN, EN, ISO, SAE and others.
Competitive Pricing
Through integrating modern machinery with veteran skill and lean workflows, we reliably produce premium iron components that provide superior value and affordability.
Fast Turnaround
Using advanced solidification modeling and optimized manufacturing, our contemporary methodology allows rapid delivery cycles for every iron casting order.
Value-Added Services
To meet global demands, SIMIS provides end-to-end manufacturing beyond basic casting. Our in-house capabilities—precision machining, heat treatment, surface finishing, assembly, and lab testing—deliver results that surpass expectations. These value-added services provide risk-free, cost-effective solutions that simplify supply chains while enhancing component performance and reliability.
Iron Casting Frequently Asked Questions
(FAQs)
What are the primary differences between Gray Iron and Ductile Iron?
Gray iron features flake graphite, providing excellent machinability and vibration damping. Ductile iron contains nodular graphite, offering much higher strength, ductility, and impact resistance.
What is Austempered Ductile Iron (ADI)?
Austempered Ductile Iron (ADI) is a premium grade of ductile iron that undergoes a specialized austempering heat treatment. This process creates a material with twice the tensile strength of standard ductile iron while retaining excellent toughness and fatigue resistance. Because it offers a superior strength-to-weight ratio and high wear resistance, ADI is an ideal, cost-effective alternative to steel forgings and alloy steels in demanding applications.
Does iron casting offer better vibration damping than steel?
Yes, cast iron, specifically gray iron, which offers significantly better vibration damping than steel. This is due to its unique microstructure, where graphite flakes act as internal buffers that absorb and dissipate mechanical energy. This natural ability to reduce noise and vibration makes gray iron the preferred material for high-stability applications like engine blocks, machine tool bases, and heavy brake components. if you choose iron over steel for these parts, you can expect significant improvements in the overall precision and service life of your machinery.
What is your maximum and minimum casting weight?
We can produce iron components ranging from 0.3kg up to several tons, depending on the molding process selected (sand casting vs. shell molding).
How do you prevent internal defects like porosity in iron castings?
We use advanced solidification simulation software to model the cooling process. This allows us to optimize riser placement and gating systems before the first pour occurs.
What heat treatment options are available for cast iron?
We provide stress relieving, annealing (to improve machinability), normalizing, and quenching/tempering to achieve specific hardness levels.
Can iron castings be welded?
While more difficult than steel due to its high carbon content (makes it brittle and prone to cracking); cast iron can be welded using specialized nickel-based electrodes and proper pre-heating/post-heating procedures.
Is iron casting cheaper than steel casting?
In general, iron casting is significantly cheaper than steel casting. On average, you can expect iron castings to cost between 20% to 30% less than steel ones for parts of similar complexity. There are several factors that make cast iron cheaper than cast steel: raw material costs, melting temperature & energy, castability and complexity and machining costs.
Which surface finish can prevent cast iron from rusting?
Cast iron can be protected from rust using various treatments tailored to the environment. For temporary protection during shipping, anti-rust oils and VCI packaging create an effective moisture barrier, while permanent solutions like powder coating or epoxy painting offer a durable shield against industrial wear.
For maximum corrosion resistance in harsh conditions, hot-dip galvanizing or E-coating provides comprehensive coverage, whereas zinc plating is preferred for components requiring strict dimensional accuracy. If you are not sure which surface finish options to go for, you can simply contact our experts for detailed consultation.
Can you help me choose a cast iron grade for my project?
Yes, we can assist in selecting the ideal cast iron grade by analyzing your project’s mechanical needs and operating environment. Our team evaluates factors like tensile strength, wear resistance, and vibration damping to determine if Gray Iron or high-strength Ductile Iron best fits your application.
By reviewing your technical drawings, we make sure the material provides optimal performance and cost-effectiveness. If you are unsure which grade to choose, contact our experts for a detailed consultation.
