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Yancheng Longwan Machinery Co., Ltd. HOME / PRODUCTS & APPLICATION / Grey Cast Iron

Grey Cast Iron Manufacturers

Gray Cast Iron is known for its good casting properties and machinability. During the casting process, the liquid iron has good fluidity and the casting is not easy to crack; its good thermal conductivity and shock absorption effect enable it to effectively absorb machine vibration energy and play a good damping effect, which is one of its important characteristics. In addition, gray cast iron exhibits good lubricity and wear resistance. When loaded repeatedly under the same stress, gray cast iron shows that the bending degree of the strain curve is significantly reduced as the number of loading times increases, and the plastic deformation after unloading is also less. Although its plasticity and toughness are low, it still has a certain strength and good tensile strength.

Grey Cast Iron Automotive Parts
Grey Cast Iron Agricultural Machinery Parts
Grey Cast Iron Reducer Accessories
Grey Cast Iron Valve Accessories
Grey Cast Iron Water Pump Accessories
Grey Cast Iron Semiconductor Accessories
Grey Cast Iron Industrial Robot Accessories
Other Grey Cast Iron Accessories
ABOUT US
Yancheng Longwan Machinery Co., Ltd.
Yancheng Longwan Machinery Co., Ltd.
Founded in 2006, which located next to National Highway 204 in Yancheng City, Jiangsu Province, 40km from the center of Yancheng City, 5km from the center of Dongtai City, 30km from Dafeng District, and 10km from the exit of Baiju Expressway, with convenient transportation. We mainly produce various types of fire-fighting pipe fittings, reducer parts, auto parts, agricultural machinery, and industrial robot parts. Its main customers include SAIC Group, Deere, Bonfiglioli (China), Shanghai Beixu, Yaskawa Electric, etc. As a famous China Grey Cast Iron Manufacturers and Grey Iron Castings Factory, our company has a variety of molding equipment, including one vertical sand-shot horizontal parting boxless shot-press molding line with specifications of 610*510*240, 120 boxes/hour, suitable for mass production of small parts; one upper and lower sand-shot horizontal parting boxless shot-press molding line with specifications of 750*650*250, 100 boxes/hour, suitable for mass production of small and medium-sized parts; 3 sets of 1.25T medium-frequency electric furnaces; 3 cleaning shot blasting machines, and now planning a lost foam production line, suitable for 100Kg~1000Kg casting production, and planning an automatic spray painting line and an electrophoretic coating line at the same time, 3 CNC lathes and 3 lathes.
Yancheng Longwan Machinery Co., Ltd.

ODM Customization Expert

Advanced Production & Processing Equipment

Longwan Machinery has a variety of advanced domestic and foreign molding equipment, including 2 fully automatic production lines for clay sand, 1 semi-automatic production line for clay sand, and 1 coated sand production line, with an annual production capacity of 15,000 tons.

Yancheng Longwan Machinery Co., Ltd.

Complete Inspection Flow

Strict Quality Inspection

We have full-process testing equipment: spectrum analyzer, metallographic microscope, universal tensile testing machine, magnetic particle flaw detector, ultrasonic flaw detector, etc.
The above equipment can fully ensure that we can provide customers with high-precision final castings, and at the same time ensure that we meet customers' comprehensive testing requirements for physical and chemical properties of materials, non-destructive testing, high-precision geometric dimension testing, etc.

Professional Casting Expert

Comprehensive Casting Manufacturer

FAQ
  • Q
    Where are your products mainly exported to?
    A

    Our products are mainly exported to multiple countries such as Germany, Japan, Italy, South Korea, and Australia.
  • Q
    How to deliver the goods to us?
    A

    Usually, we ship by sea, which is very convenient for export.

    Of course, if the customer's goods are urgent, we can also air freight them. Ningbo Airport and Shanghai International Airport are both very close to us.
  • Q
    What's the payment term?
    A

    When quoting, we will confirm the transaction method with you.

    For mass production, we usually make a 50% advance payment in advance and then inspect and confirm the shipment before paying the remaining balance.
  • Q
    How to guarantee the quality of your goods?
    A

    Firstly, there will be corresponding inspections after each process, and for the final completed product, we will conduct a full inspection according to customer requirements and international standards;

    Then, we have advanced and complete top testing equipment in the industry: spectral analyzers, metallographic microscopes, universal tensile testing machines, magnetic particle testing machines, ultrasonic testing machines, etc.

    The above equipment can fully ensure the provision of high-precision final castings to customers, while also meeting the comprehensive testing requirements of customers for material physical and chemical properties, non-destructive testing, high-precision geometric dimension testing, and so on.
  • Q
    How many employees of your company? what about the technicists?
    A

    Our company has more than 120 employees, including 10 professional technicians and 5 engineers.
  • Q
    How about the capacity of your company?
    A

    We have 2 fully automatic clay sand production lines, 1 semi-automatic clay sand production line, and 1 coated sand production line, with an annual production capacity of 15000 tons.
  • Q
    Do you have some standard parts?
    A

    No, currently we produce and customize according to the requirements based on the drawings provided by the customer.
  • Q
    Can you do customized products?
    A

    Yes, we are mainly doing customized products according to the customers’ drawings or samples.
  • Q
    What applications do your products relate to?
    A

    Our products cover almost all the applicable equipment manufacturing and machinery manufacturing and processing fields, mainly including automotive trucks, engineering machinery, agricultural machinery, reducers, water pumps, water treatment systems, and other fields.
  • Q
    what products can you offer?
    A

    We mainly produce cast iron parts made of gray cast iron and ductile iron materials.
  • Q
    Are you a direct manufacturer or trading company?
    A

    We are a foundry and a manufacturer of cast iron parts.
  • Q
    How long can I get the feedbacks after we sent the inquiry?
    A

    We will reply to you within 24 hours of the working day.
NEWS
Grey Cast Iron Industry knowledge
Key Properties of Grey Cast Iron
One of the most defining features of grey cast iron is its graphite structure, which is present as graphite flakes dispersed throughout the metal matrix. This specific form of graphite influences several critical aspects of the material's performance. The graphite flakes within the iron matrix provide inherent damping properties, which help to reduce the transmission of vibrations and noise. This makes grey cast iron particularly well-suited for applications such as engine blocks, machinery foundations, and other components where controlling vibration is essential. The graphite’s ability to absorb mechanical energy is one of the reasons why grey cast iron is frequently used in sectors requiring equipment with lower operational noise levels. The graphite structure also plays a role in the material's fracture resistance. It allows grey cast iron to absorb stress more efficiently without the risk of sudden failure. This is particularly beneficial in applications where materials are exposed to fluctuating loads, such as engine components or structural parts in machinery. The presence of graphite contributes to the material’s thermal conductivity. Grey cast iron can efficiently dissipate heat, which is vital in applications like automotive engine blocks, where heat management is a primary consideration. At Yancheng Longwan Machinery Co., Ltd., the company leverages advanced casting technologies to optimize the graphite distribution, ensuring that its grey iron castings offer superior damping properties and consistent performance. Their molding facilities, such as the vertical and horizontal parting molding lines, are designed to produce highly effective grey iron parts that meet specific industrial demands.

Grey cast iron is renowned for its excellent castability, which allows it to be easily molded into complex and detailed shapes. The material's fluidity when molten allows it to fill intricate molds, ensuring precise reproduction of design features. This ease of casting also reduces the need for extensive machining, making grey cast iron a highly efficient material for high-volume production. Grey cast iron’s castability enables the production of complex components with sophisticated geometries, which is highly valuable in industries like automotive, where engine parts and chassis components often require intricate designs. Because grey cast iron can be poured into molds with high accuracy, the need for post-casting operations, such as machining, is minimized. This leads to cost savings and faster production times. At Yancheng Longwan Machinery Co., Ltd., the use of cutting-edge molding lines—such as their 750×650×250 upper and lower sand-shot horizontal parting molding line—ensures high precision in casting components. This is vital for producing parts with tight tolerances for sectors such as industrial robotics and agriculture, where precision is a critical factor.

Grey cast iron offers outstanding resistance to wear, a characteristic that is particularly beneficial in components exposed to repeated friction or abrasive conditions. The graphite flakes embedded within the metal matrix act as a natural lubricant, reducing friction between moving surfaces and improving the material’s ability to resist wear over time. Components made from grey cast iron, such as cylinder blocks, brake drums, and gear components, are designed to withstand substantial mechanical stress and wear. In automotive engines, for example, grey cast iron’s wear resistance helps prolong the lifespan of key components like pistons and cylinder walls, which are subject to constant friction. In machinery and heavy-duty equipment, grey cast iron is often used for parts that come into contact with abrasive materials. Its wear resistance helps to ensure that these parts can endure the rigorous demands of industrial processes over extended periods. Yancheng Longwan Machinery Co., Ltd. capitalizes on this characteristic by producing grey iron components designed for durability. The company’s precision casting techniques ensure that each part maintains optimal wear resistance, thus reducing the frequency of maintenance and replacement in high-performance applications.

Grey cast iron is highly machinable, which means it can be easily shaped, drilled, and finished into precise components. The graphite flakes in the material act as a natural lubricant, reducing tool wear during machining and enabling smoother cutting operations. The presence of graphite reduces the friction between the material and cutting tools, allowing for a more efficient machining process. This results in less wear on tools and can increase the lifespan of machinery used in production. Due to its machinability, grey cast iron can be manufactured with minimal effort in terms of post-casting processing. This reduces the overall cost of production, which is an advantage in mass manufacturing. At Yancheng Longwan Machinery Co., Ltd., the company employs advanced machining technology, including CNC lathes and other specialized equipment, to further refine grey iron components. This allows the company to produce highly accurate castings that meet the exacting standards of industries like automotive and industrial robotics, where precision and cost-effectiveness are paramount.

Grey cast iron strikes a balance between strength and toughness, which makes it a versatile material for a wide range of structural applications. The combination of ferrite or pearlite in the matrix, along with the graphite content, imparts the material with the ability to resist cracking under stress, while still maintaining the necessary strength to support heavy loads. Grey cast iron is used in heavy-duty applications such as structural supports, engine blocks, and machine tool components. The material’s ability to bear significant loads without cracking or failing makes it a reliable choice for such applications. The strength of grey cast iron can be adjusted by modifying the amount of pearlite or ferrite in the alloy. For example, increasing the pearlite content can improve strength, while a higher ferrite content can enhance ductility. This flexibility in composition allows manufacturers to tailor the material’s properties to the specific needs of the application. Yancheng Longwan Machinery Co., Ltd. takes advantage of this adjustability in grey cast iron to create parts that meet the unique demands of its clients. The company’s casting facilities, which include 1.25T medium-frequency electric furnaces, ensure that the alloy compositions are precisely controlled to deliver the desired strength and toughness for each application.