• DUCTILE IRON PIPES C Class DN350 System 1
  • DUCTILE IRON PIPES C Class DN350 System 2
DUCTILE IRON PIPES C Class DN350

DUCTILE IRON PIPES C Class DN350

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Ductile Iron Cast Pipe is without any defects compare with tradition casting tech, which has many advantages particularly as follow:

(1) High density. In the "vertical upward casting" process, the melt iron of centre liquid column in center crystallizer is continuously feeding for volume shrinkage caused by condensation tube at outer circumference , which lead to be free of shrinkage porosity.

(2) High purity. When melt iron pouring, the mixed impurities such as gas, dross, sand grain which are lighter than melt iron could be eliminated at furnace mouth, its impossible to enter into the crystallizer through the channel, so the melt iron into the crystallizer is very pure.

(3) Strength with toughness. The cooling speed provided by continuous crystallizer is 30 times than sand casting and 5 times than centrifugal casting, and doesn't produce white iron, the eutectic cell volume of continuous cast iron is one eighth to one tenth compare with traditional cast iron. The density of graphite nodule in ductile iron can reach 300-700 pcs/mm2. Therefore, all reason above improve the strength and toughness of continuous cast iron.

(4) Free machining. The high speed cooling make the hardening phase (such as boride, steadite) not appear like reticular, massive or thick, but diffuse like fish bone and pane in shape, moreover, there are tiny graphite flakes inlaid hardening phase. It's free machining in BrinellHardness the range of 250-300HB. However, the Brinell Hardness of 250 is top limit to common metal materials.

(5) Uniform composition of tube wall. The convection mixing of liquid column caused by marching type drawing in crystallizer make the composition of tube wall well-distributed, and concentration gradient very little.

(6) High productivity. To the wall thickness of tube under 10mm, the speed of continuous casting is 1 meter/min, to the wall thickness of tube under 20mm, the speed of continuous casting is 0.5 meter/min, which is high efficiency that centrifugal or other casting tech couldn't reach.


Q:Does the cast iron pipe need separate corrosion protection?
No, the inner and outer corrosion protection of the tube has been done.
Q:The difference between cast iron pipe and ductile iron pipe
I don't understand your question! Both have spigot and socket connection type pipe material, also have flange,
Q:Do ductile iron pipes require internal linings for potable water?
Internal linings are not required for potable water in ductile iron pipes. Ductile iron, a type of iron that has been strengthened and made more flexible, is commonly used in water distribution systems due to its durability and resistance to corrosion. Unlike cast iron or steel, ductile iron pipes have a protective cement-mortar lining. This lining acts as a strong barrier against corrosion and prevents the release of harmful substances into the water. It is applied during the manufacturing process and is designed to withstand the corrosive properties of potable water, eliminating the need for internal linings. Furthermore, the smooth surface of ductile iron pipes ensures the quality and flow of water without the necessity of additional linings.
Q:Is the ambient temperature at minus 20 degrees better with grey cast iron or ductile iron?
Ductile iron castings have been used in almost all major industries. These departments require high strength, plasticity, toughness, wear resistance, and resistance to ductile iron
Q:Can ductile iron pipe be used for water treatment plants?
Yes, ductile iron pipe can be used for water treatment plants. Ductile iron pipes are known for their strength, durability, and corrosion resistance, making them suitable for transporting water and other fluids in various industrial applications, including water treatment plants.
Q:What are the typical joint sealing requirements for ductile iron pipes under pressure?
The typical joint sealing requirements for ductile iron pipes under pressure involve the use of gaskets and mechanical joints to ensure a leak-free connection. Gaskets are typically made of rubber or synthetic materials and are placed between the pipe ends to create a tight seal. These gaskets are designed to withstand the pressure of the flowing fluid and prevent any leakage. They also provide flexibility to accommodate for any slight misalignment or movement of the pipes. Mechanical joints, such as push-on joints or restrained joints, are another common method of sealing ductile iron pipes. These joints consist of a mechanical connection that securely holds the pipe ends together. They can provide a reliable seal without the need for additional gaskets. In addition to gaskets and mechanical joints, proper installation techniques are crucial for ensuring effective joint sealing. This includes proper alignment of the pipes, correct tightening of bolts or screws, and the use of appropriate lubricants or sealants. It is important to note that the specific joint sealing requirements for ductile iron pipes under pressure may vary depending on the application, the type of fluid being transported, and the applicable industry standards or regulations. Therefore, it is essential to consult the manufacturer's guidelines and relevant codes to determine the appropriate joint sealing requirements for a specific project.
Q:How does ductile iron pipe perform in seismic areas?
Ductile iron pipe performs exceptionally well in seismic areas due to its inherent strength and flexibility. Seismic activity can subject pipelines to significant ground movements and vibrations, and ductile iron pipes have proven to be highly resilient in such conditions. The unique properties of ductile iron, including its high tensile strength and ductility, allow it to absorb the energy generated during seismic events. This ability to flex and bend without breaking or fracturing makes it an excellent choice for areas prone to earthquakes. Furthermore, ductile iron pipes are designed and manufactured to withstand external forces and ground movements. They are often installed with flexible joints that can accommodate ground shifts and maintain the integrity of the pipeline system. These joints can absorb lateral and angular movements, reducing the risk of pipe failure. Additionally, ductile iron pipes have a long history of successful performance in seismic areas. They have been extensively tested and proven to meet or exceed industry standards for seismic resistance. This reliability is crucial in ensuring the safety and functionality of water and wastewater systems, even in the event of a seismic event. Overall, ductile iron pipe is a reliable and durable choice for pipelines in seismic areas. Its ability to withstand ground movements, its flexibility, and its proven track record make it an excellent option for ensuring the integrity and functionality of water and wastewater systems in earthquake-prone regions.
Q:Are ductile iron pipes resistant to root intrusion?
Yes, ductile iron pipes are generally resistant to root intrusion due to their strong and durable composition.
Q:Are ductile iron pipes resistant to UV radiation?
Ductile iron pipes do not possess resistance against UV radiation. The exposure to UV radiation can lead to the deterioration and weakening of the material as time goes by. In order to safeguard ductile iron pipes from UV radiation, they must be covered or enveloped with a UV-resistant substance or coated with an appropriate protective layer. Furthermore, it is essential to conduct regular inspections and maintain the pipes adequately to identify and rectify any indications of UV damage.
Q:Are ductile iron pipes prone to leakage?
Ductile iron pipes are generally considered to be resistant to leakage. This type of pipe is known for its durability and strength, making it less prone to leaks compared to other materials like PVC or even cast iron pipes. Ductile iron pipes are designed to withstand high pressure and can withstand heavy loads, making them ideal for various applications such as water supply, sewage systems, and industrial pipelines. The unique properties of ductile iron, including its flexibility and ability to absorb vibrations and shocks, contribute to its resistance against leaks. Ductile iron pipes have a high tensile strength, which means they can handle the internal and external pressures exerted on them without cracking or breaking. Furthermore, ductile iron pipes have joints that are designed to be leak-proof. These joints are typically sealed with rubber gaskets and connected using various methods such as push-on joints or restrained joints with mechanical couplings. These joint designs ensure a secure and watertight connection, reducing the risk of leaks. However, like any other type of pipe, ductile iron pipes can still experience leaks under certain circumstances. Factors such as age, corrosion, poor installation, or ground movement can contribute to the development of leaks over time. Regular maintenance and inspections are important to identify and address any potential issues that may lead to leaks. Overall, while ductile iron pipes are generally resistant to leakage and known for their reliability, it is essential to ensure proper installation, regular maintenance, and timely repairs to maximize their longevity and prevent any potential leaks.

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