MARINE CASTINGS
High-Quality Custom & OEM Marine Castings
SIMIS is a specialized metal casting manufacturer based in China, providing custom and OEM marine components. Our facility includes dedicated workshops for investment casting, sand casting, shell mold casting, and die casting, all supported by integrated machining, surface treatment, and inspection departments. We supply cast and machined parts for a wide range of marine applications, including components for yachts, commercial cargo ships, offshore infrastructure, fishing equipment, and high-performance racing boats.
We produce marine castings across various material grades in accordance with international standards. Our engineering team provides technical support to assist you in selecting the most suitable materials and casting processes for your specific requirements.
What are Marine Castings?
Marine castings are specialized components manufactured for saltwater and subsea environments. The process involves pouring molten metal into a mold to solidify into forms like propellers, anchors, deck hardware, and mooring bollards. SIMIS uses investment, sand, die, and shell mold casting to provide advantages for various marine applications.
Cast marine parts can feature complex internal geometries and hollow sections necessary for flow dynamics. These designs are often too costly or impossible to produce via machining. We manufacture these parts using stainless steel, aluminum, cast iron, and titanium alloys according to international standards for the marine sector.
Marine castings require attention to detail throughout production, including specialized surface treatments such as mirror polishing, powder coating, and anodizing. At SIMIS, all marine castings meet high quality standards for use in premium or safety-dependent applications.
Our Marine Parts Casting Processes
To produce marine castings for demanding environments, SIMIS uses investment casting, sand casting, shell mold casting, and die casting. Each technique offers benefits for part size, surface finish, and precision required for saltwater environments. These manufacturing options allow us to produce marine parts ranging from propulsion systems to structural hull components. We provide technical support to help you select the casting method that fits your alloy specifications and delivery schedules.
Investment Casting
Investment casting is the most common method for marine parts, as it uses wax patterns to create intricate, high-precision components with smooth surface finishes. This method works well for producing complex and accurate marine castings that require tight dimensional tolerances.
Die Casting
Gravity die casting and pressure die casting are methods we frequently use to manufacture precise aluminum and copper marine parts. These techniques provide high repeatability, efficiency, and thin-walled precision for components such as valve housings, junction boxes, and decorative parts.
Shell Mold Casting
For steel or cast iron marine casting components like heavy-duty hinges and specialized pulleys, we use shell mold casting. The process uses resin-bonded sand to create a thin-walled shell, providing an efficient way to produce medium-sized parts with complex exterior details and stable dimensions.
Sand Casting
Sand casting is a versatile solution for manufacturing large and heavy marine parts. This method works for a wide range of metal alloys and suits parts that require robust structural strength and significant wall thickness, including large anchors, heavy-duty mooring bollards and keel blocks.
Advantages of Casting for Marine Parts
At SIMIS, our metal casting processes provide the marine industry with high-quality components and complex designs along with many other benefits. Our core metal casting methods can produce many types of marine parts in a wide range of shapes and dimensions. We deliver parts with high structural strength, diverse material options, varied sizes and weights, and precise finishes. These major benefits give a competitive edge to our marine castings, which perform reliably under pressure while lowering costs through minimized machining.
High Structural Integrity and Strength
Cast marine components provide uniform mechanical properties throughout the part. Because the metal solidifies into the final shape, it creates a robust structure capable of withstanding the high pressures and heavy loads found in subsea and deep-sea operations.
Extensive Material Versatility
Metal casting processes work for a wide range of alloys specifically chosen for the marine environment. At SIMIS, we use these processes to cast materials like bronze, stainless steel, titanium, and aluminum alloys that provide high resistance to saltwater corrosion and biofouling for various marine applications.
Creation of Complex Geometries
Metal casting allows for the production of intricate shapes and internal cavities that are difficult to achieve through machining or other metal forming processes like forging and fabrication. In marine applications, casting techniques are particularly useful for creating a wide variety of parts, such as deck hardware, boat engine components, and offshore infrastructure components.
Scalability in Size and Weight
One of the primary benefits of metal casting processes is their capability to produce parts across a vast size spectrum. We use different casting methods to manufacture everything from small, detailed deck fittings to massive, multi-ton anchors and keel blocks, with weights ranging from a few grams to over 5 tons.
Superior Surface Finish and Precision
Advanced casting methods, especially the investment casting technique, produce smooth finishes and ultra-tight tolerances for marine parts. These high-quality surfaces improve fluid dynamics and allow the proper alignment of precision-fit marine hardware in maritime applications.
Common Casting Materials for Marine Parts
We use a variety of metal alloys to produce marine castings that meet strict industry standards for longevity. The performance of a component under high-pressure or corrosive conditions depends on the selected material grade. Our production includes everything from stainless steel and aluminum alloys to nickel-based metals and ductile iron. Our material versatility allows us to manufacture custom marine parts that satisfy both general industry standards and specific customer demands.
Stainless Steel
Stainless steel is widely used for marine parts and provides superior corrosion resistance for hundreds of applications. Grades like 316L and Duplex 2205 are commonly used for propellers, deck fittings, anchors, and decorative parts needing long-term resistance to pitting corrosion.
Aluminum Alloy
Aluminum alloy is an excellent choice for marine parts that need to be both light and durable. Its resistance to corrosion and ability to conduct heat make it highly effective. We use aluminum for items such as radar housings and junction boxes where a high strength-to-weight ratio is required.
Cast Iron
Gray and ductile cast irons are the standard for heavy-duty marine infrastructure components. We use these materials to cast large-scale components like offshore mooring bollards and rudder components because they handle vibration and mechanical wear exceptionally well.
Copper Alloy
Copper alloy offers high strength and natural antifouling properties for marine parts. It is also resistant to biofouling and has superior thermal conductivity. We use copper alloys primarily for casting components like propellers, fittings, and pump bodies.
Titanium Alloy
Titanium alloy provides extreme durability and weight savings. It is virtually immune to saltwater corrosion and offers high temperature resistance. We use titanium to cast marine parts such as submarine components and racing boat parts where a high strength-to-weight ratio is a primary requirement.
Nickel Alloy
Nickel-based alloy is extremely effective against extreme heat and aggressive chemical environments. Because this material maintains its strength at high temperatures, we use it to cast specialized marine parts like racing boat turbocharger housings and propellers.
Typical Marine Components We Cast
At SIMIS, we cast a diverse range of high-quality components for the global marine industry. Our flexible casting processes allow us to meet various market demands with precision. We specialize in parts for commercial vessels, such as cargo ships, tankers, and ferries, as well as industrial boats like tugs, trawlers, and high-performance racing craft. Our expertise also extends to offshore and subsea infrastructure.
Our standard marine castings production includes deck hardware and fittings, mooring and docking equipment, rudder components, anchoring system parts, as well as steering and propulsion components. Beyond our core OEM product line, we use our technical expertise to manufacture bespoke parts tailored to your specific material and engineering requirements. The following non-exhaustive list shows our frequently cast marine components.
Propeller
Recommended Materials
We typically cast this part in stainless steel or titanium to manage high-velocity fluid flow and prevent corrosion. These materials provide the strength-to-weight ratio required to maintain blade integrity under intense hydraulic pressure.
Recommended Processes
We use investment casting for complex, curved blades and smooth finishes to minimize drag. Sand casting handles larger cast steel propellers with significant metal volumes while maintaining the structural density required for heavy-duty propulsion.
Cleat
Recommended Materials
This component is typically cast in 316L stainless steel or 2205 duplex stainless steel to provide total resistance to the marine environment. Cleats cast from these material grades provide surface hardness and maintain a high-quality aesthetic over time.
Recommended Processes
Investment casting is used for cleats to reach high dimensional accuracy and a smooth surface that requires minimal secondary polishing. This process is perfect for the production of complex shapes for secure rope tie-off points.
Anchor
Recommended Materials
Anchors are typically cast in galvanized steel or stainless steel to manage the harsh conditions of the seabed. These materials are chosen for their density and their ability to resist corrosion while submerged for long periods.
Recommended Processes
Sand casting and shell mold casting are used to produce heavy and medium to large cast steel and cast iron anchors, while investment casting is primarily used for small to medium sized stainless steel anchors for commercial boats and yachts.
Rudder
Recommended Materials
We typically use high-tensile alloy steel or carbon steel for rudders to make sure the part can withstand heavy mechanical stress. These materials are chosen for their high yield strength and their ability to resist deformation during sharp maneuvering.
Recommended Processes
Sand casting is used for these large, structural components because it handles the significant mass and thick-walled sections. This method provides the most efficient and cost-effective way to cast these large components.
Fishing Rod Holder
Recommended Materials
We typically use 316L stainless steel or 2205 duplex stainless steel for rod holders to make sure they do not pit or rust over time. These materials are chosen for their strength and their ability to take a mirror-like polish that appeals to recreational boaters.
Recommended Processes
Investment casting is used to achieve the thin walls and hollow centers required for the holder. This process provides the ability to cast the part in a single piece to prevent weak joints that could fail under the weight of heavy fishing gear.
Steering Wheel
Recommended Materials
This part is typically cast in 316L stainless steel or marine-grade aluminum to prevent oxidation and pitting. These materials are chosen for their ability to maintain a mirror-polished or powder-coated finish even in a salt-heavy atmosphere.
Recommended Processes
Investment casting achieves the intricate detail and ergonomic contours required for comfortable operation. This process produces the wheel as a single, seamless piece with high dimensional accuracy, reducing the need for secondary grinding.
Deck Hatch
Recommended Materials
We typically use marine-grade aluminum for hatches to provide a lightweight yet durable solution. This material is chosen for its high strength-to-weight ratio and its natural resistance to corrosion in damp environments.
Recommended Processes
Both gravity die casting and pressure die casting can be used to produce the frames and lids. We use precision machining on the mating surfaces to meet the critical dimensional tolerances required for a completely watertight seal.
Scupper
Recommended Materials
We typically use 316L stainless steel or copper alloy for scuppers to manage constant exposure to standing water and debris. These materials are chosen for their immunity to rust and their ability to handle the erosive effects of moving water.
Recommended Processes
Investment casting is commonly used to create the complex internal channels needed for efficient fluid flow. These processes allow us to produce smooth internal passages that prevent debris from clogging the drainage system.
Stanchion Base
Recommended Materials
Stanchion bases are typically cast in 316L or 2205 duplex stainless steel to handle the stress of safety loads. These materials are chosen for their structural integrity and ability to match the finish of other polished deck hardware.
Recommended Processes
Investment casting produces these bases with integrated mounting holes and a clean, seamless design. This process provides the high structural integrity required for safety-critical components while maintaining tight tolerances for railing posts.
Chock
Recommended Materials
We typically use cast steel or copper alloy for chocks to manage the constant friction of moving lines. These materials are chosen for their surface hardness and their ability to remain smooth even after years of contact with heavy ropes.
Recommended Processes
Shell mold casting or sand casting is used to produce these durable parts. We use precision finishing on the internal radius of the chock to create a friction-resistant surface for the longevity of the vessel’s mooring lines.
Mooring Bollard
Recommended Materials
We typically use ductile iron for casting mooring bollards to manage high-tension loads and sudden impacts. This material is chosen for its superior toughness and its ability to absorb energy without fracturing under extreme pressure.
Recommended Processes
Sand casting produces these high-mass components as it is the most effective method for creating the thick cross-sections needed for safety. We use specialized molds to produce the base and post with maximum density to handle mooring line leverage.
Keel Block
Recommended Materials
Keel blocks are typically cast in carbon steel or ductile iron to manage the high compressive forces of a ship’s weight. These materials are chosen for their excellent load distribution properties and high resistance to crushing.
Recommended Processes
Sand casting is used to create these heavy, solid blocks, as it makes the pouring of large metal volumes for such dense parts possible. This process provides the block with the necessary mass to remain stable on the dry dock floor.
Surface Treatment Options for Marine Castings
Surface treatments protect marine castings from oxidation and harsh maritime environments. These finishes are necessary to maintain structural integrity and prolong part life. By performing these processes in-house, SIMIS maintains strict quality control and efficient production schedules, reducing overall costs. Our current options include mirror polishing, as-machined surfaces, powder coating, painting, anodizing, and electroplating.
Mirror Polishing
The mirror polishing finish provides a high-quality, mirror-like finish that reaches even the most visible external surfaces of deck hardware. It is the preferred choice for cast components requiring aesthetic brilliance and superior salt-spray resistance over long-term operation.
As-Machined
This functional finishing method leaves the marine castings' surface exactly as it appears after precise mechanical cutting. We use this option for mating components requiring strict dimensional tolerances, where a raw appearance is acceptable because structural precision outweighs aesthetics.
Powder Coating
This process applies a thick, protective polymer shell over the metal substrate. This finish remains a popular choice for hardware demanding impact resilience and aesthetics, providing a robust barrier that shields the underlying cast iron or steel marine casting parts from environmental degradation.
Painting
This versatile method applies a protective liquid coating over the surface of large marine casting parts, typically cast steel or cast iron. We use this finish for components requiring specific UV resistance, providing a durable layer that maintains color depth while protecting the underlying metal substrate.
Anodizing
This electrochemical process creates a hard, integrated oxide layer across all exposed aluminum surfaces. This finish is used for structural parts needing exceptional wear resistance and permanent color stability, as the marine castings maintain their integrity despite harsh UV rays and abrasion.
Electroplating
This specialized method deposits a thin metallic layer over marine castings through an electric current. We use this finish for hardware requiring specific conductivity or a decorative chrome look, providing a protective barrier that resists tarnishing during heavy maritime use.
Our Advanced Marine Casting Specialties
At SIMIS, our advanced manufacturing specialties support the production of marine casting parts and components. We use CAD software for professional tooling design, 3D printing for rapid prototyping, and high-resolution 3D scanning with advanced CMM and casting simulation for precise reverse engineering.
Tooling Design
Our team of skilled engineers designs high-quality tooling for custom marine parts. We use advanced CNC precision machining to produce highly accurate tools for various casting projects.
Prototyping
We use 3D-printed marine casting samples to verify designs for custom projects. This gives customers the ability to quickly validate geometry before proceeding to subsequent sample production.
Reverse Engineering
We use 3D scanning and CMM technology to capture the dimensions of existing marine components. This data helps us extract exact geometries to manufacture accurate replacements using your specified materials.
Casting Simulation
Our team uses advanced software to model metal velocity and thermal gradients. This analysis helps us mitigate porosity and refine gating systems for better structural integrity before we begin casting marine parts.
Why Choose SIMIS for Marine Castings?
SIMIS is an ISO9001 certified manufacturer in China. Our team combines engineering expertise with industrial production capacity, providing customers with the freedom to customize and select from various material grades for their marine casting projects. We manage the whole manufacturing process, which allows for quick turnaround times and competitive prices. Our proactive approach meets the diverse material and geometric specifications required for marine castings.
Quality Assured
Our inspection protocols maintain traceability for all marine castings. We provide chemical analysis and mechanical test results with each shipment to verify material and integrity.
Rich Experience
Our team uses twenty years of experience to manage the full production cycle. We handle everything from initial tooling to finished component delivery for marine castings.
Customization Capabilities
We scale production for custom marine castings using flexible solutions. Our team handles complex geometries, specific alloys, and diverse finishes for project requirements.
Material Expertise
Our team assists with material selection for marine castings. We offer technical guidance regarding metal and alloy grades based on performance and weight.
Competitive Pricing
We use modern equipment and an integrated approach to deliver competitive marine castings. This strategy helps manage and reduce production costs effectively today.
Fast Turnaround
We use casting simulation and high-capacity lines to optimize production workflows. This approach helps us meet project timelines and reduce delivery schedules effectively.
Value-Added Services
Beyond standard casting services, SIMIS offers comprehensive value-added solutions, including in-house heat treatment, machining, surface finishing, and assembly. We use an integrated workflow to maintain quality standards, schedules, and logistics, helping our team lower production costs and improve lead times for marine casting components.
Marine Casting Frequently Asked Questions
(FAQs)
Can you manage high-volume production for custom marine parts?
Our facility scales production for custom marine castings using flexible solutions. We produce over 2000 tons of stainless steel castings annually and many other materials using various automated and robotic-assisted metal casting production lines.
We manage complex geometries and specific alloys to meet diverse project requirements while maintaining consistent production schedules. We use advanced facility management to process these high volumes and help clients meet their critical delivery timelines for every order.
Can you assist with material selection for weight-sensitive projects?
Our team supports material selection for marine castings to help you reach weight reduction goals. We provide technical guidance on metal and alloy grades based on part structure, specific performance, and weight requirements to help you reach optimal results.
We use technical data to compare density and tensile strength across various materials. This engineering support helps you manage the balance between structural integrity and mass, helping your project meet strict maritime weight limits without compromising on part durability.
Which alloys do you recommend for marine castings used in high-salinity environments?
Our team often recommends duplex stainless steel or aluminum bronze (a type of copper alloy) for these conditions. We use these alloys because they offer superior resistance to pitting and crevice corrosion in seawater.
We use these high-performance materials to manage aggressive electrochemical reactions in salt-rich environments. These alloys help maintain structural integrity and prevent surface degradation over long service lives. We suggest specific metal grades based on the actual environment where you use your parts. This technical selection helps you meet demanding safety standards for every custom marine casting.
Can you replicate obsolete marine parts from a physical sample?
We use 3D laser scanning to create digital models from existing parts. Using a reverse engineering process helps us produce accurate new castings for legacy equipment and maritime repairs.
We use high-precision scanners to capture complex geometries and convert physical dimensions into digital files. Such data helps our team recreate discontinued components with extreme accuracy. Using these digital models helps reduce lead times for critical repairs on older maritime vessels.
Our team can then design and produce the tools and cast from the reverse-engineered digital model using whichever material you require.
What are the benefits of using duplex stainless steel for marine castings?
We use duplex stainless steel (such as grade 2205) for marine castings because it provides high yield strength and superior resistance to stress corrosion cracking. This material helps extend the service life of components exposed to high-pressure saltwater compared to standard austenitic grades.
The unique dual-phase microstructure combines the benefits of both ferritic and austenitic steels. We use this alloy to manage demanding structural requirements, as parts made from this material withstand the most aggressive maritime environments for a long time.
What are the differences between 316L and 2205 stainless steel for marine parts?
We use both 316L and 2205 stainless steel for marine castings, but they serve different performance requirements. 316L is an austenitic grade known for excellent formability and resistance to general corrosion. In contrast, 2205 is a duplex stainless steel that provides nearly double the mechanical strength of 316L.
Regarding corrosion, 2205 offers superior resistance to pitting and crevice corrosion in high-chloride environments. We often recommend 2205 for high-stress components because its chemistry helps manage stress corrosion cracking more effectively than 316L. While 316L remains a less expensive choice for standard hardware, we use 2205 for critical structural parts where weight reduction and high durability are necessary.
Can you help me select optimal casting material for marine components?
Our team selects the optimal materials for your marine casting projects. We use technical data regarding corrosion resistance, mechanical strength, and weight to identify the best alloy for your specific maritime application.
We analyze environmental factors like salt concentration and temperature to recommend suitable materials and grades such as 316L stainless steel or specialized copper alloys. We provide project-specific technical guidance to help you manage performance requirements and lifecycle costs for every custom project.
How does titanium alloy compare to stainless steel for marine parts?
We use titanium alloys when marine casting projects require a superior strength-to-weight ratio (roughly 45% lighter than stainless steel) and total immunity to seawater corrosion. While stainless steel is a reliable and cost-effective choice for many applications, titanium provides significantly lower density and higher fatigue resistance.
We often recommend titanium for weight-sensitive parts or high-performance marine racing applications. Using this material helps reduce long-term maintenance needs and extends the service life of parts in highly aggressive environments where stainless steel might eventually suffer from pitting.
What is your MOQ for marine castings?
We do not usually set a minimum order quantity for marine castings. For custom parts, we charge a tooling cost. Please note that higher quantities result in greater discounts; we provide quotations with tiered pricing for your reference.
Do you provide design support for marine castings?
Although we do not directly help design parts for aesthetics, we provide suggestions regarding the casting process. For example, we help customers reduce weight by removing unnecessary sections or suggest increasing the wall thickness of certain thin-walled areas.
These adjustments help the casting maintain rigidity and combat deformation after the cooling process. Our team bases these opinions on technical experience and data from casting simulation software. The customer ultimately makes the final decision regarding these professional recommendations.
