The carbon steel melting point is a fundamental property that dictates how this material behaves under high temperatures during industrial production. As an alloy comprised primarily of iron and carbon,...
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CARBON STEEL CASTING SERVICES
High-Quality Custom & OEM Carbon Steel Castings
SIMIS is an integrated Chinese manufacturer specializing in custom and OEM carbon steel casting. Our foundational strength lies in the flexibility of our three dedicated foundry workshops, which are proficient in investment casting, sand casting, and shell mold casting. Our robust casting versatility allows us to balance the critical factors of cost-efficiency, scale, and dimensional accuracy to suit any client specification.
We offer a full-service model that covers the entire production process—from initial tool making and casting through all necessary post-casting services: multi-purpose heat treatment, high-precision machining, custom surface finishing, and strict quality inspection. Our capacity for customization and our engineering expertise ensure precise compliance with the most challenging requirements, from complex geometries to tight tolerances. We maintain broad material capabilities, casting low carbon steel, medium carbon steel, and high carbon steel grades to serve the global industry market.
What is Carbon Steel Casting?
Carbon steel casting is the manufacturing process where molten carbon steel is poured into a mold, solidifying to produce the final component geometry. This fundamental technique produces robust parts for industrial sectors through metal casting methods such as investment casting, sand casting, and shell mold casting.
Carbon steel consists of iron and carbon, with its properties determined by the carbon percentage rather than additional metallic elements. Low carbon steel provides high ductility, medium carbon steel balances strength and wear resistance, and high carbon steel provides maximum hardness.
The use of carbon steel provides reliable mechanical properties, including good structural strength, durability, and cost-efficiency. The specific carbon steel grade is carefully selected to match the required strength profile and weldability, aligning with the intended service conditions of the finished component.
Carbon Steel Casting Processes
We produce carbon steel components using a versatile array of three main metal casting techniques at SIMIS: investment casting, sand casting, and shell mold casting. The unique characteristics of each process allow us to meet varied client requirements regarding geometry, size, complexity, surface finish, and tolerance. By assessing a customer’s needs for cost-effectiveness, lead time, and production volume, we determine and recommend the most suitable casting method for optimal results.
Investment Casting
For carbon steel components, we employ the rapid drying investment casting process to achieve the highest quality and intricacy. This method consistently delivers exceptional dimensional accuracy, tight tolerances, and a superior surface finish compared to other processes.
Sand Casting
Sand casting is the most cost-effective and flexible method for manufacturing large, heavy carbon steel parts that have less complex geometries. Using custom sand molds, the process is ideal for high production volumes and accommodating various carbon steel grades.
Shell Mold Casting
We use shell mold casting for carbon steel components requiring a balance of quality and cost. By employing a rigid, thin shell mold—created from sand and thermosetting resin—this process yields a significantly improved surface finish and tighter tolerances compared to standard sand casting.
Advantages of Carbon Steel Casting
Carbon steel casting is a common manufacturing method known for its robust material properties and versatility. This technique produces reliable parts for demanding industrial applications. The primary advantages include cost-effectiveness, high weldability, structural reliability, and flexibility for complex shapes. Carbon steel also adapts easily to heat treatment, allowing components to meet performance requirements in diverse operational environments.
Adaptability to Heat Treatment
Carbon steel responds very well to various heat treatment processes (such as normalizing, quenching, and tempering). This allows us to precisely manipulate the mechanical properties—such as increasing hardness or improving toughness—post-casting, ensuring the finished component precisely matches the requirements of its intended service environment.
Structural Strength and Reliability
Carbon steel castings provide reliable structural strength, durability, and resistance to impact. By controlling the carbon content, we can alter the tensile strength and hardness to meet specific load-bearing requirements, thus making it ideal for components subjected to regular stress and moderate wear.
Intricate Geometry Capabilities
Carbon steel casting overcomes the limitations of traditional subtractive manufacturing. Metal casting processes are able to produce components featuring intricate geometries, complex internal cavities, thin walls, and irregular shapes that would be costly or impossible to create through machining, welding, laser cutting, and some other manufacturing processes.
High Versatility and Weldability
Carbon steel offers excellent mechanical properties suitable for a vast range of general applications. Most carbon steel grades (especially low and medium carbon steel) have superior weldability compared to many high-alloy steels. It allows for easier and more reliable component assembly, structural fabrication, and field repair.
Cost-Effectiveness and Material Availability
Carbon steel is one of the most widely produced and least expensive ferrous alloys. The high availability and relatively simple chemical requirements translate directly into lower material costs compared to alloy or stainless steels. Furthermore, casting is often the most cost-effective way to produce complex shapes, minimizing material waste and extensive post-casting machining.
Common Carbon Steel Casting Grades
Achieving high-performance carbon steel castings requires making the correct material grade selection. A component’s strength, toughness, and durability are entirely governed by its specific chemistry. SIMIS supports your project with deep material expertise, casting a wide range of standard carbon steels that fully comply with global specifications (AISI, ASTM, GB, EN). To ensure you select the optimal and most cost-effective grade, please examine our list below and reach out to our team for specialized guidance.
1018 / GB 15 / 1.0449
Key Properties
This low carbon steel has excellent weldability and machinability; high ductility and good toughness, making it easy to form and finish.
Typical Applications
It is commonly used for small, non-critical structural brackets, simple industrial fittings, connectors, hinges, levers, clamps, spacers, and plugs.
1025 / GB 25 / 1.0406
Key Properties
This low carbon steel offers a balanced combination of strength and toughness, often performing slightly better than 1018 in non-critical load-bearing roles.
Typical Applications
Applications include general machinery housings, low-stress industrial equipment frames, light-duty railway components, support pedestals and gearbox covers.
1040 / GB 40 / 1.0540
Key Properties
This medium carbon steel provides significantly higher strength and modest wear resistance compared to low-carbon grades.
Typical Applications
It is utilized in parts like connecting rods, heavy machine linkages, and gear blanks that require increased durability.
1045 / GB 45 / 1.0503
Key Properties
This medium carbon steel is a popular all-around steel for casting; provides good mechanical properties after normalizing or quenching and tempering.
Typical Applications
The common applications of this grade include connecting rods, crank arms, heavy-duty gear blanks, clutch parts and other heavy machinery components.
1060 / GB 60 / 1.0601
Key Properties
This high carbon steel grade provides better intrinsic wear resistance and strength than AISI 1045, even before specialized heat treatment.
Typical Applications
Applications include industrial rollers, railway friction pads, and components needing reliable surface hardness without extreme alloying.
1080 / GB 80 / 1.1260
Key Properties
This high carbon steel is used when the primary requirement is maximum potential surface hardness and excellent abrasion resistance after quenching.
Typical Applications
Parts cast from this grade are typically heavy-duty tracks, crushing equipment components, and specialized high-wear fittings in mining.
ASTM A27 Grade 60-30
Key Properties
This low carbon steel has excellent weldability and machinability; high ductility and good toughness, making it easy to form and finish.
Typical Applications
It is commonly used for small, non-critical structural brackets, simple industrial fittings, and connectors.
ASTM A216 WCA
Key Properties
This low carbon steel is the basic pressure-containing grade, maintaining excellent weldability and reliability at moderate temperatures.
Typical Applications
It is used almost extensively for simple valve bodies, pumps, flanges, and piping fittings where pressure retention is required.
ASTM A216 WCB
Key Properties
This medium carbon steel is the most common pressure-retaining grade, valued for its robust strength, temperature stability, and superior weld repair capability.
Typical Applications
Key applications are high-integrity valve casings, pump bodies, and complex pressure components in power generation and chemical processing.
ASTM A148 Grade 90-60
Key Properties
This medium carbon steel is a high-strength structural grade, defined by its minimum 90 ksi tensile strength and high load-bearing capacity.
Typical Applications
It is frequently used for heavy-duty components in construction equipment, large sprockets, and complex load-bearing frames.
ASTM A148 Grade 105-85
Key Properties
This high carbon steel is a very high-strength grade that mandates a quenching and tempering heat treatment to reach minimum tensile strength of 105 ksi.
Typical Applications
It is suitable for heavily stressed, high-impact structural parts in defense and heavy construction machinery.
ASTM A148 Grade 120-95
Key Properties
This high carbon steel represents one of the strongest simple carbon steel compositions available under ASTM, providing high mechanical strength and reliable hardness.
Typical Applications
This grade is commonly used for extremely demanding, high-stress components like heavy machinery linkages and large industrial tools.
Surface Treatment Options for Carbon Steel Castings
The final performance and appearance of the cast component rely heavily on the surface finishing process applied after casting and cleaning. This finishing step directly enhances resistance against corrosion and wear. We offer a complete range of finishing solutions organized into three main categories: organic coatings (e.g., powder coating, e-coating, painting), chemical treatments (e.g., black oxidizing), and metallic coatings (e.g., electroplating, hot-dip galvanizing). Proper selection from this suite ensures the casting is fully protected and optimized for its demanding service environment.
Powder Coating
Powder coating is one of the most durable methods used for carbon steel castings. It applies a dry powder using an electrostatic charge, which is then thermally cured to form a cohesive film. This coating is known for creating a thick, chip-resistant layer that offers superior wear and corrosion protection.
Electrocoating
E-coating applies paint electrophoretically while the carbon steel casting component is immersed in a bath. This process guarantees uniform coverage across intricate and recessed internal geometries, delivering comprehensive and reliable corrosion resistance.
Painting
Painting is a fundamental and common finishing method for carbon steel castings, offering an economical alternative to more intensive coating processes. This method is effective for large components, providing a good level of corrosion resistance and improving the overall aesthetic finish.
Black Oxidizing
Black Oxidizing is a chemical conversion process that reacts with the carbon steel casting surface to form a thin, protective layer of magnetite. This treatment provides a non-reflective black aesthetic and mild corrosion protection without causing any measurable dimensional change to the component.
Electroplating
Electroplating deposits metals (e.g., zinc, chromium, nickel) onto the carbon steel casting components using an electric current in an electrolyte bath. Its main purpose is to enhance hardness and wear resistance or to provide a bright aesthetic finish, all while preserving dimensional precision.
Hot-Dip Galvanizing
Hot-dip galvanizing process immerses the carbon steel casting parts in molten zinc, creating a thick, durable zinc-iron alloy coating. This metallurgical bond provides castings with superior, long-term corrosion protection and is especially effective in harsh outdoor environments.
Applications and Industries Benefit From Carbon Steel Casting
Carbon steel casting is widely used across diverse industrial sectors, providing a reliable manufacturing solution for parts requiring structural strength, impact resistance, and durability. Low, medium, and high carbon steel castings maintain operation under high stress, impact, and extreme temperatures. This capability is useful for heavy industrial sectors such as oil and gas, power transmission, railway, mining, and agricultural equipment.
Railway Carbon Steel Castings
The severe operating environment of the railway industry mandates components with exceptional fatigue strength and unparalleled durability. Carbon steel castings deliver this performance, enabling the production of single, monolithic parts that eliminate weak points associated with fabrication and welding. Medium and high carbon steels are widely used to ensure these components withstand continuous, dynamic impact and heavy static loads.
Typical cast parts include critical safety items like couplings, center plates, and heavy bogie frames for rolling stock, as well as railway point machine components (e.g., clamp locks, slides and couplings).
These parts commonly specify high-performance carbon grades like AISI 1045 for heat-treated wear plates and ASTM A148 Grade 105-85 for components requiring maximized tensile strength and impact resistance.
Pump and Valve Components
For the pump and valve industry, carbon steel castings are vital for their ability to deliver precise dimensional control and reliable pressure containment across varying temperatures. The use of metal casting processes is fundamental to economically producing the intricate, monolithic geometries required for these flow control components.
We specialize in casting components such as high-pressure valve bodies, bonnets, and various pump casings. These parts primarily utilize the core ASTM A216 carbon steel series: Grade WCA provides entry-level pressure containment, Grade WCB is the industry standard for general pressure service, and Grade WCC is specified when the application demands the highest tensile and yield strength available in a simple carbon steel casting.
Carbon steel is a relatively less expensive option compared to alloy steel for casting pump and valve components, yet providing necessary mechancial requirements.
Mining & Construction Carbon Steel Castings
The mining and construction industries demand components capable of withstanding severe impact, high abrasive wear, and extreme material stress.
Carbon steel castings are very commonly used in this sector to ensure continuous, heavy-duty operation and prevent costly downtime by providing necessary yield strength and durability. Medium and high carbon steels are widely used for casting parts with complex, wear-resistant, near-net-shape geometries like teeth, linkages, and liner plates that are difficult to forge or machine.
Key cast components include excavator bucket adapters, heavy-duty linkages, dragline chain links, and machine undercarriage components. These critical applications rely on high-strength carbon grades such as ASTM A27 Gr. 70-40 for robust structural parts and ASTM A148 Gr. 120-95 for the most demanding components requiring maximum yield strength and toughness.
Automotive Carbon Steel Casting Parts
Carbon steel castings are vital to the automotive industry, providing the high durability, fatigue resistance, and strength required for critical components subjected to constant load cycling.
Cast components across the low, medium, and high carbon steel spectrum are used extensively. Low carbon steels (such as ASTM A27 Gr. 65-35) are commonly used for structural support brackets, smaller mounting flanges, and components where weldability and superior ductility are prioritized over ultimate strength. Medium carbon steels are commonly used for casting the high-stress parts.
Common cast components include drivetrain and transmission housings, gear blanks, steering knuckles, and heavy structural brackets. These demanding applications frequently specify heat-treatable grades like AISI 1050 and high-strength ASTM grades such as A148 Grade 105-85 for functional and structural integrity.
Oil & Gas Carbon Steel Castings
Carbon steel castings are critical to the Oil & Gas industry, which requires components to maintain extreme integrity against high pressure, temperature, and chemical exposure. carbon steel is a more cost-effective option for this industry compared to most alloy steels.
Carbon steel casting is frequently used for producing parts with complex, heavy-walled, monolithic geometries—like high-pressure valve bodies and pump casings—necessary for guaranteed pressure containment.
Parts and components we cast typically include wellhead equipment, large valve bodies, fittings, and manifolds in both subsea and processing facilities. These parts rely on various carbon steel grades, namely ASTM A216 Grade WCB for general high-pressure service and A216 Grade WCC for applications demanding the highest strength and yield within the simple carbon steel family. Medium and high carbon steel grades like 1045 and 1060 are also frequently used.
Power Transmission Carbon Steel Castings
For the power transmission and generation sector, where components are subjected to extreme heat, high rotational stress, and thermal fatigue, carbon steel castings offer a cost-effective solution for structural and non-critical pressure parts. Several metal casting methods are used for manufacturing monolithic parts with optimized strength profiles.
We routinely cast medium to large carbon steel components for this industry sector, including gear wheel blanks for heavy industrial drives, various motor and generator casings, linkage arms, gearbox housings, and specialized support rings.
Less critical sections of gas and steam turbines, such as intermediate casings and structural supports, also utilize cast carbon steel. These parts typically specify high-strength grades like AISI 1050 for hardened gears and ASTM A148 Grade 105-85 for components requiring maximized yield strength and fatigue life.
Agricultural Machinery Carbon Steel Castings
In the agricultural machinery sector, parts and components are subjected to constant abrasive soil contact and high-impact forces. The final component performance relies heavily on robust yet less expensive carbon steel castings (compared to alloy steel castings).
The metal casting process of carbon steel agricultural machinery parts allows for the manufacturing of intricate, near-net-shape geometries (like tillage points) that are difficult, costly, or impossible to forge, machine, weld, or other processes efficiently.
Medium carbon steels are widely specified to ensure the longevity of heavy-duty parts. We routinely cast agricultural carbon steel components including disc blades, ripper points, differential cases, and heavy-duty structural linkages. These parts utilize strong, medium carbon grades like ASTM A27 Gr. 70-40 for structural members and high-strength AISI 1045 chemistry (often heat-treated) for specific drive components requiring wear and fatigue resistance.
Engineering Machinery Carbon Steel Castings
For heavy machinery and specialized industrial equipment, cast components must deliver exceptional impact resistance and long fatigue life under constant load. Carbon steel castings are a cost-effective choice, allowing for the creation of intricate, monolithic structures that simplify assembly and enhance structural integrity.
Various grades of carbon steels are commonly used in this sector. Low carbon steels are often chosen for large frames and linkages where field weldability and high toughness are essential. High carbon steels are used where extreme wear is expected.
We routinely cast major components like large frames, complex gear housings, and heavy-duty brackets. These applications utilize reliable grades such as ASTM A27 Grade 65-35 for less critical structural supports, AISI 1060 for specialized wear parts (e.g., track shoes), and ASTM A148 Grade 90-60 for highly stressed pivot and drive components.
Why Choose SIMIS For Carbon Steel Casting Services?
SIMIS is an integrated metal casting manufacturer in China providing custom carbon steel castings using advanced technology. Choosing SIMIS provides several advantages and benefits that help your projects succeed. As an ISO 9001-certified manufacturer with high production capacity, we use advanced equipment and facilities to cast hundreds of grades of metals. We also save you money and effort by offering one-stop services.
Quality Assured
Our carbon steel castings are 100% inspected and fully traceable. We provide all necessary reports detailing chemical analysis and mechanical results.
High Production Capacity
Our annual carbon steel casting capacity exceeds 1,500 tons. This high volume directly allows for lower production costs and expedited delivery.
Advanced Equipment
Our facilities run on a combination of automated and manual processes, utilizing cutting-edge equipment. Operations are precisely optimized using advanced casting simulation software.
Material Expertise
We cast carbon steels in both standard and specialized grades. Our capabilities cover a wide range of international standards, including AISI, ASTM, SAE, EN, DIN, and GB.
Competitive Pricing
By combining advanced equipment with seasoned expertise and efficient processes, we consistently deliver high-quality carbon steel castings that maintain excellent cost-effectiveness.
Fast Turnaround
Featuring precise casting simulation and high-efficiency production lines, our modern approach guarantees fast turnaround times for all carbon steel castings.
Value-Added Services
SIMIS is a professional foundry delivering complete manufacturing solutions. Our in-house services include tooling design, heat treatment, surface finishing, and assembly. All processes are checked by dedicated testing labs. This method simplifies logistics and results in lower costs and faster delivery for finished carbon steel castings.
Carbon Steel Casting Frequently Asked Questions(FAQs)
What is the main advantage of using medium carbon steel in casting over low carbon steel?
The main advantage is the potential for high strength and hardness; medium carbon steel (e.g. AISI 1045) can be effectively heat-treated (quenched and tempered) after casting to significantly increase its wear resistance and tensile strength, thus making it ideal for gears and highly stressed structural parts.
What purpose does heat treatment serve for carbon steel castings?
Heat treatment, such as normalizing, quenching, and tempering, is essential for carbon steel castings as it refines the grain structure, relieves internal stresses from the solidification process, and ensures the casting achieves the specific mechanical properties (like toughness and yield strength) mandated by the ASTM specification.
Can you recommend a surface treatment for protecting my carbon steel castings against corrosion?
Yes, we operate several in-house surface treatment facilities, and we can definitely recommend the optimal surface finishing technique to protect your parts. This recommendation will depend on your budget, the level of protection you want to achieve, and the desired aesthetic of your components.
What is the difference between a carbon steel casting and a standard wrought carbon steel?
A carbon steel casting is metal that is poured into a mold to achieve its final shape, and its strength is defined by minimum mechanical property requirements (e.g., ASTM A27 Grade 65-35). Wrought steel (like AISI 1045) is hot-rolled or forged, and its definition is primarily based on a specific, fixed chemical composition.
What is the typical surface finish achieved directly after the carbon steel casting is cleaned?
Directly after cleaning (which involves sandblasting or shot blasting), the castings are ready for further processing. This cleaning step is mandatory before the castings can be moved to additional surface finishing processes. The resulting surface finish is typically rough with a granular, matte texture known as the as-cast finish, and it requires further processing (like machining or coating) for precise dimensional tolerances or environmental protection.
What is the difference between carbon steel castings and alloy steel castings?
The main difference is in the chemistry: carbon steel castings derive their strength and properties primarily from their carbon content, while alloy steel castings include intentionally added elements like Chromium, Nickel, or Molybdenum. These alloying elements grant alloy steel components superior performance characteristics such as exceptional resistance to high temperatures, corrosion, or extreme wear that simple carbon steel cannot achieve.
Nevertheless, carbon steel castings are typically less expensive than alloy steel castings, and they can meet the same purpose as alloy steel castings in many applications.
Why is weldability a major concern when specifying carbon steel casting grades?
Weldability is a major concern because higher carbon content (typical of high-strength grades) increases the risk of cracking during and after the welding process, which is often required for repair or assembly. Therefore, low-carbon grades like ASTM A27 Gr. 60-30 are often selected when guaranteed repair or field welding is anticipated.
What is your MOQ for casting carbon steel parts?
We don’t normally set a minimum order quantity for regular cast grades. However, for special carbon steel grades, our MOQ is 300 kg. Please also note that the higher the quantity, the bigger the discount.
I have a part made in stainless steel, can you cast it with carbon steel?
Yes, we can absolutely cast a part designed for stainless steel using carbon steel, but this change is a fundamental material substitution that requires re-engineering and specification review. The good news is, since we operate both stainless steel and carbon steel casting foundries, we can certainly produce the part in carbon steel for you. Please note that changing materials often necessitates new tooling to account for the difference in metal shrinkage.
What is the fundamental factor that determines which carbon steel grade I need?
The fundamental factor is the required minimum mechanical strength, specifically the yield strength and tensile strength necessary for the component to function safely under its maximum anticipated load. This requirement directly dictates the necessary carbon content, leading you toward low, medium, or high carbon grades.
To get the most definitive recommendation, you must provide three key pieces of information: the required minimum yield strength (or the equivalent ASTM grade), the intended service temperature (especially if high pressure is involved), and whether field welding or field machining is a requirement.
Carbon Steel Casting Knowledge Base
This section provides various resources to help you learn about carbon steel casting. You can find technical details regarding different grades, such as low, medium, and high carbon steels, and how their specific carbon content influences hardness, ductility, and strength. These articles explain the processes used to manufacture durable parts for industries such as construction, automotive, and heavy machinery. Use this knowledge base to understand how carbon steel casting services provide reliable and cost-effective solutions for components that require high structural integrity.
ASTM A216 WCB Casting: Everything You Need to Know
ASTM A216 WCB is a specific material grade within the carbon steel family. It falls under the ASTM A216 standard, which covers carbon steel castings for high-temperature service and pressure-containing...
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A216 WCA Carbon Steel Casting: Properties, Benefits and Applications
ASTM A216 WCA is a standard material specification for carbon steel castings used in high-temperature service. This grade is specifically designed for pressure-containing parts, such as those found in piping...
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AISI 1020 Carbon Steel: Equivalents, Compositions, Properties and Applications
AISI 1020 carbon steel is a widely used low carbon steel. Its low carbon content means it is soft and easy to shape. It also welds well. While it is...
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Comprehensive Guide of Medium Carbon Steel: Grades, Properties, Advantages and Uses
Medium carbon steel represents a distinct category within the broad family of carbon steels, sitting between its low and high carbon counterparts. This material is defined by its carbon content,...
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Properties and Applications of AISI 1050 Carbon Steel Castings
AISI 1050 carbon steel castings are a vital material in many industries, widely appreciated for their excellent balance of strength and toughness. As a medium-carbon steel, AISI 1050 strikes a...
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AISI 1030 Carbon Steel: A Definitive Guide
AISI 1030 carbon steel is a widely used material, classified as a medium carbon steel. It’s an iron-carbon alloy containing approximately 0.30% carbon, which gives it a good balance of...
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High Carbon Steel: Grades, Processes, Properties, and Applications
High carbon steel is a material frequently used in heavy-duty industries for manufacturing components such as industrial machinery parts and heavy-duty equipment components. This material is known for its exceptional...
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