China’s Strong Manufacturing Power, Providing Industrial-Grade Precision Die Castings
Shanghai Leierwo Castings has over 18 years of experience in precision castings manufacturing, providing customers with high-quality castings that meet the most demanding industry standards. We specialize in manufacturing custom precision casting components using a variety of metal materials, including carbon steel, stainless steel, and alloy steel. Whether it’s industrial precision castings, automotive precision castings, or other custom casting parts, we can cast them to precise specifications, ensuring optimal performance and durability.
Our advanced production facilities, skilled technicians, and strict quality control processes guarantee that every casting delivers reliability and efficiency. As one of the leading casting manufacturers in China, we are committed to offering tailored solutions to meet your unique requirements. Feel free to contact us to discuss your needs—we look forward to partnering with you and providing exceptional casting solutions.
Die Casting Samples
We provide a variety of castings, including automotive and pump valve castings, to ensure quality and precision. Each casting undergoes strict quality control and testing. We offer customized casting production based on client specifications for small-batch trials, ensuring a strong foundation for mass production.
Our Casting Capabilities
Our Investment Casting Capabilities
We strictly follow Standard Operating Procedures (SOP) in every stage of our production process. The main steps include: pouring simulation, mold development, raw material inspection, wax pattern making, shell making, metal pouring, cleaning and heat treatment, inspection, warehouse packaging, and shipping.
Mold Development
Our technical department develops the molds, while the quality department conducts dimensional inspections using a coordinate measuring machine (CMM).
Wax Pattern
The workshop utilizes fully automated wax injection machines, which automatically set wax injection pressure, holding time, and other parameters to produce high-quality wax patterns.
Shell Preparation
The workshop operates four automated production lines with an annual capacity of 1,800 shell molds. We monitor the humidity, temperature, and concentration of the aluminum chloride solution using hygrometers, barometers, and pH meters.
Metal Pouring
Currently, six 500KG furnaces are in production, with an additional four 500KG backup furnaces available for increased capacity. All operators undergo rigorous testing to ensure materials meet required specifications.
Cleaning & Heat Treatment
Our fully equipped workshop includes 10 heat treatment furnaces, 5 quenching furnaces, 2 central shot blasting machines, and 15 large shot blasting machines.
Inspection
All raw casting dimensions are inspected using a CMM (Coordinate Measuring Machine). We also utilize Rockwell hardness testers, dynamic balancing machines, and roundness testers. Our certified quality control team conducts UT (Ultrasonic Testing), PT (Penetrant Testing), and MT (Magnetic Particle Testing) to ensure product quality.
Water Glass Casting
Water glass investment casting, also known as water glass precision casting, is a widely used casting process that employs water glass (sodium silicate solution) as a binder combined with refractory materials to create molds for metal components. This cost-effective and high-precision method is extensively used in the automotive, machinery, and aerospace industries.
At Leierwo, our precision cast parts produced through the water glass casting process achieve general linear tolerances of ISO 8062 CT7-CT8 and a surface roughness of approximately Ra12.5. This casting method is commonly used for manufacturing excavator bucket teeth, adapters, truck components, and agricultural machinery parts.
At Leierwo, our precision cast parts produced through the water glass casting process achieve general linear tolerances of ISO 8062 CT7-CT8 and a surface roughness of approximately Ra12.5. This casting method is commonly used for manufacturing excavator bucket teeth, adapters, truck components, and agricultural machinery parts.
Silica Sol Casting
Silica sol casting is a high-precision investment casting process that uses silica sol as a binder, combined with precision mold technology, to produce metal parts with high accuracy and smooth surfaces. This casting method is widely used in aerospace, automotive, and medical device industries.
Leierwo utilizes the silica sol casting process to manufacture castings with an internal diameter tolerance of ISO 8062 CT4-CT6. The surface finish can reach Ra6.3. Compared to water glass casting, silica sol casting offers superior quality but comes at a higher cost. We primarily use this casting method for stainless steel castings and other precision steel components.
Leierwo utilizes the silica sol casting process to manufacture castings with an internal diameter tolerance of ISO 8062 CT4-CT6. The surface finish can reach Ra6.3. Compared to water glass casting, silica sol casting offers superior quality but comes at a higher cost. We primarily use this casting method for stainless steel castings and other precision steel components.
Investment Casting Materials
Leierwo meets the standards of ASTM, SAE, AISI, ACI, DIN, EN, ISO, and GB, offering casting capabilities for hundreds of ferrous and non-ferrous alloy materials. Our expertise includes stainless steel, alloy steel, copper alloys, aluminum alloys, nickel-based alloys, carbon steel, cast iron, and more.
Stainless Steel
Due to its excellent durability and corrosion resistance, stainless steel has become one of the most popular materials in investment casting production. At Leierwo, we can cast various types of stainless steel, including martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, precipitation-hardened stainless steel, and duplex stainless steel.
Alloy Steel
Alloy steel castings are steel castings alloyed with elements such as molybdenum, manganese, nickel, chromium, vanadium, silicon, and boron. Precision-cast alloy steel parts offer enhanced strength, hardness, wear resistance, and toughness. Typical alloy steel grades for precision casting include AISI 4130, AISI 4140, AISI 8620, and AISI 8630.
Carbon Steel
Nickel-Based Alloys
Copper Alloys
Customizable Surface Treatment Options
Shot Blasting
Shot blasting is a surface treatment process that involves propelling abrasive materials at high speeds to remove surface contaminants, scale, or rust. This process enhances surface adhesion for subsequent coatings and improves fatigue resistance.
Machining
Machining is a precision process used to achieve tight tolerances and smooth surface finishes. It includes milling, turning, drilling, and grinding to meet specific dimensional and functional requirements.
Paint Coating
Paint coating provides a protective and decorative finish to alloy steel surfaces. It enhances corrosion resistance and allows for various color and texture options, making it ideal for aesthetic and functional purposes.
Powder Coating
Powder coating is a dry finishing process that creates a durable, wear-resistant, and corrosion-resistant surface. It offers a uniform appearance and is available in a variety of colors and textures.
Galvanized Coating
Galvanization involves applying a layer of zinc to the steel surface, offering excellent corrosion protection. Hot-dip galvanizing and electro-galvanizing are common methods used to extend the lifespan of steel components.
Black Oxide Coating
Black oxide treatment creates a thin, black protective layer on the steel surface to improve corrosion resistance and reduce light reflection. It is commonly used in automotive, aerospace, and tooling applications.
Sand Casting Process
Leierwo’s sand casting services can utilize seven different types of metal materials—gray iron, ductile iron, stainless steel, alloy steel, carbon steel, aluminum, and copper.
Mold Development
Molds are designed and manufactured according to drawing requirements. For single-piece production, wooden molds can be used, while plastic or metal molds are preferred for mass production. For high-volume casting, templates are utilized. Our molds are primarily made from aluminum.
Modeling (Core Making)
This process includes:
Molding – Creating the mold cavity using molding sand.
Core Making – Forming the internal shape of the casting.
Assembly – Placing the core into the mold cavity and sealing the upper and lower sandboxes.
Molding is a crucial step in the casting process.
Molding – Creating the mold cavity using molding sand.
Core Making – Forming the internal shape of the casting.
Assembly – Placing the core into the mold cavity and sealing the upper and lower sandboxes.
Molding is a crucial step in the casting process.
Melting
Based on the required metal composition, a chemical composition analysis is conducted. The appropriate melting furnace is selected to melt alloy materials into a qualified liquid metal with the correct composition and temperature.
Metal Pouring
The qualified molten metal is poured into the sand mold within the sandbox. Since the pouring stage involves high safety risks, we enforce strict process controls to ensure the safety of our employees.
Cleaning & Heat Treatment
Once the molten metal has been poured and solidified, the sand mold is removed, and excess materials such as gates and risers are cleaned off to form the final casting.
Inspection
All raw casting dimensions are inspected using a CMM (Coordinate Measuring Machine). We also utilize Rockwell hardness testers, dynamic balancing machines, and roundness testers. Our certified quality control team conducts UT (Ultrasonic Testing), PT (Penetrant Testing), and MT (Magnetic Particle Testing) to ensure product quality.
Sand Casting Materials
Leierwo’s sand casting services can utilize seven different types of metal materials—gray iron, ductile iron, stainless steel, alloy steel, carbon steel, aluminum, and copper.
Gray Iron Sand Casting
Gray iron gets its name from the color of its fracture surface. Due to its excellent machinability and lower cost, gray iron is commonly used in sand casting.
Ductile Iron Sand Casting
Ductile iron sand castings are strong and durable, known for their impact and fatigue resistance. Its spheroidal graphite inclusions enhance ductility and help prevent cracks throughout the component’s service life.
Stainless Steel Sand Casting
Stainless steel is a popular choice for industries requiring durable and corrosion-resistant components. In most applications, this metal retains its quality without the need for additional plating or coatings.
Alloy Steel Sand Casting
Low-alloy steel contains varying amounts of different elements to enhance specific properties required for each component’s intended use. Known for its toughness, wear resistance, and high-temperature durability, alloy steel is an excellent choice for industrial applications.
Carbon Steel Sand Casting
Carbon steel derives its strength from the addition of carbon and is widely recognized for its durability. It offers excellent corrosion resistance, and with proper protection and maintenance, these components have a long service life.
Aluminum Sand Casting
Aluminum is one of the most popular metals for casting due to its ability to produce strong yet lightweight components. Depending on its alloy composition, aluminum is a cost-effective alternative to other metals with similar properties.
Brass Sand Casting
Brass sand castings are widely used in the construction industry for their aesthetic appeal, corrosion resistance, and rust prevention. Their excellent surface finish options make them a preferred choice for decorative and functional applications.
Customizable Surface Treatment Options
Shot Blasting
Shot blasting is a surface treatment process that involves propelling abrasive materials at high speeds to remove surface contaminants, scale, or rust. This process enhances surface adhesion for subsequent coatings and improves fatigue resistance.
Machining
Machining is a precision process used to achieve tight tolerances and smooth surface finishes. It includes milling, turning, drilling, and grinding to meet specific dimensional and functional requirements.
Paint Coating
Paint coating provides a protective and decorative finish to alloy steel surfaces. It enhances corrosion resistance and allows for various color and texture options, making it ideal for aesthetic and functional purposes.
Powder Coating
Powder coating is a dry finishing process that creates a durable, wear-resistant, and corrosion-resistant surface. It offers a uniform appearance and is available in a variety of colors and textures.
Galvanized Coating
Galvanization involves applying a layer of zinc to the steel surface, offering excellent corrosion protection. Hot-dip galvanizing and electro-galvanizing are common methods used to extend the lifespan of steel components.
Black Oxide Coating
Black oxide treatment creates a thin, black protective layer on the steel surface to improve corrosion resistance and reduce light reflection. It is commonly used in automotive, aerospace, and tooling applications.
Casting Manufacturer: Pressure Testing and Non-Destructive Testing
We ensure that our castings undergo pressure testing. We also perform non-destructive testing (NDT) to verify the integrity of the products. We guarantee that all products we manufacture are leak-free. Additionally, our silica sol casting process ensures excellent surface finish and dimensional accuracy. This allows us to meet the drawing requirements through casting alone, eliminating the need for additional machining. This provides our customers with unparalleled surface treatment and ensures top-notch quality.
OUR PARTNERS
Leierwo serves customers across North America, South America, Asia, and Europe. Our key clients are based in the United States, Canada, the United Kingdom, Italy, Germany, France, Japan, Saudi Arabia, and more. Over the past 18 years, we have built and maintained strong relationships with our clients by providing exceptional customer service and high-quality cast products.
FAQ
Q1. Are you a trading company or a manufacturer?
Q2. Can you quote based on 3D drawings?
Q3. How do you handle RFQs (Request for Quotation)?
Q4. What is your typical lead time?
Q5. Do you provide samples? Are they free?
Q6. What payment methods do you accept?
Q7. How do you ensure quality control?
Q8. Do your products come with a warranty?
Q9. How do you view your relationship with customers?
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