DUCTILE IRON PIPE K8 DN1100

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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:How are ductile iron pipes protected from external damage?: Ductile iron pipes are protected from external damage through the application of protective coatings. These coatings act as a barrier, shielding the pipes from corrosion and other forms of external damage. Additionally, the pipes may be encased in concrete or installed in a casing pipe to provide further protection against external forces and impacts.

Q:How are ductile iron pipes manufactured?: Ductile iron pipes are produced using a technique called centrifugal casting, which employs a spinning mold. The process commences with the selection and preparation of top-notch ductile iron, a form of cast iron containing small quantities of magnesium to enhance its strength and ductility. Initially, the ductile iron is melted in a furnace at exceedingly high temperatures. Once the molten iron attains the desired temperature, it is poured into a rotating mold. Shaped like a pipe, the mold spins at a high speed, ensuring even distribution of the molten iron along its inner surface. While the mold spins, the molten iron cools and solidifies against the mold walls. This swift cooling leads to the formation of a fine-grained structure, thereby augmenting the mechanical properties of the pipe, including its strength and durability. The spinning mold continues to rotate until the pipe solidifies completely, typically within a few minutes. Upon solidification, the pipe is extracted from the mold and any excess material, referred to as the "skin," is eliminated. Typically, machining or grinding is employed to remove the skin, achieving the desired dimensions and surface finish. Subsequently, the pipe undergoes heat treatment to further enhance its mechanical properties and alleviate internal stresses. After the completion of heat treatment, the pipe undergoes a thorough inspection to identify any defects or imperfections. This inspection encompasses visual examinations, non-destructive testing methods, and pressure testing to ensure compliance with the required specifications and standards. If any defects are detected, the severity of the issue determines whether the pipe undergoes repair or is rejected. Lastly, the pipes are coated with a protective layer to prevent corrosion and extend their lifespan. This protective coating can be applied through various methods, such as cement mortar lining, epoxy coating, or zinc coating. In summary, the manufacturing process of ductile iron pipes encompasses iron melting, centrifugal casting, cooling, skin removal, heat treatment, inspection, and coating. This process guarantees the production of high-quality pipes characterized by exceptional strength, durability, and resistance to corrosion.

Q:The difference between ductile cast iron pipe and machine-made cast iron pipe: Production process is different, ductile iron pipe mainly through intermediate frequency furnace heating, annealing, and then do cement lining cement lining production, the mechanism of cast iron pipe does not make cement lining.

Q:What is the expected internal lining material for ductile iron pipes?: Typically, the anticipated internal lining materials for ductile iron pipes are either cement mortar lining or polyethylene lining. Cement mortar lining serves as a protective layer on the inner surface of the ductile iron pipe, shielding it from corrosion and prolonging its lifespan. Conversely, polyethylene lining is a thermoplastic substance that possesses resistance against corrosion, abrasion, and chemicals, making it well-suited for situations involving aggressive substances or poor water quality. Depending on the project's specific requirements and conditions, both lining materials offer their own advantages and are commonly utilized within the industry.

Q:Can ductile iron pipes be recycled?: Yes, ductile iron pipes can be recycled. Ductile iron is a highly recyclable material, and the pipes can be melted down and reused in various applications, reducing the need for raw materials and promoting a more sustainable approach to infrastructure development.

Q:What is the weight of ductile iron pipe compared to other pipe materials?: Ductile iron pipe is generally heavier compared to other pipe materials. Its weight can vary depending on the size and thickness of the pipe, but generally, ductile iron pipe is denser and has a higher weight per unit length compared to materials like PVC, HDPE, or steel. This higher weight of ductile iron pipe is primarily due to its composition, which includes iron and carbon, making it a sturdy and durable option for various piping applications.

Q:What are the advantages of cast iron pipes?: The ductile iron pipe with flexible joint construction, convenient operation, can improve the efficiency of construction, improve the construction conditions, reduce the construction cost, and most of the rubber ring connection interface, simple operation, can shorten the construction period, reduce the construction cost.

Q:How do ductile iron pipes handle pressure surges in pumping stations?: Ductile iron pipes are known for their strength and durability, making them well-equipped to handle pressure surges in pumping stations. These pipes have a high resistance to impact and are designed to withstand the sudden increase in pressure that occurs during surge events. Additionally, their flexible nature allows them to absorb and distribute the force exerted by the surge, minimizing the risk of pipe failure or damage. Overall, ductile iron pipes are a reliable choice for handling pressure surges in pumping stations.

Q:Are ductile iron pipes suitable for power plant cooling systems?: Yes, ductile iron pipes are suitable for power plant cooling systems. Ductile iron pipes offer several advantages that make them ideal for such applications. Firstly, ductile iron is known for its high strength and durability, making it capable of withstanding the high pressure and heavy loads often associated with power plant cooling systems. Additionally, ductile iron pipes have excellent resistance to corrosion, which is crucial in an environment where water and other cooling fluids are constantly flowing. Furthermore, ductile iron pipes have good thermal conductivity, meaning they can efficiently transfer heat away from the power plant equipment, contributing to the overall cooling process. Lastly, ductile iron pipes are also cost-effective compared to other materials commonly used in power plant cooling systems, making them a practical choice for such applications. Overall, ductile iron pipes are a reliable and suitable option for power plant cooling systems due to their strength, corrosion resistance, thermal conductivity, and cost-effectiveness.

Q:Are ductile iron pipes suitable for installation in rocky or hard soil conditions?: Yes, ductile iron pipes are suitable for installation in rocky or hard soil conditions. Ductile iron has excellent strength and durability, making it highly resistant to external pressures and impacts. It can withstand the challenges posed by rocky or hard soils, ensuring reliable and long-lasting performance.

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