• DUCTILE IRON PIPES K8 DN350 System 1
  • DUCTILE IRON PIPES K8 DN350 System 2
  • DUCTILE IRON PIPES K8 DN350 System 3
DUCTILE IRON PIPES K8 DN350

DUCTILE IRON PIPES K8 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:What are the requirements for the hydrostatic test of ductile iron pipes?
The pipe work pressure P is less than 0.5MPa, the test pressure is 2P, the pipe work pressure is greater than 0.5MPa, the test pressure is P+0.5. After the water pressure rises to the test pressure, the pressure is fixed for 10 minutes, and the pipe joint and the pipe body are not damaged and leaked.
Q:Are ductile iron pipes suitable for installation in areas with high groundwater salinity?
Areas with high groundwater salinity are generally suitable for the installation of ductile iron pipes. Ductile iron is renowned for its resistance to corrosion, making it a favored choice for various applications, such as water and wastewater systems. High groundwater salinity refers to the increased presence of dissolved salts in the water. Although this can potentially cause corrosion in certain materials, ductile iron pipes are specifically engineered to withstand such conditions. These pipes are equipped with a protective lining, usually composed of cement mortar or polyurethane, which acts as a barrier between the pipe and its surroundings, including highly saline water. The lining serves to prevent any corrosive effects of the high groundwater salinity on the iron pipe, ensuring its long-lasting durability and reliability. Furthermore, ductile iron pipes possess a high tensile strength, enabling them to endure external loads and pressure, even in demanding environments. It is important to acknowledge that the suitability of ductile iron pipes for areas with high groundwater salinity can also be influenced by factors such as the specific levels of salinity, the presence of other corrosive agents, and the overall design and installation practices. Therefore, it is advisable to consult experts or engineers who are familiar with the local conditions in order to determine the most appropriate materials and precautions for specific installation projects.
Q:What are the lubricants for the installation of ductile iron pipes for tap water?
When choosing lubricant, it is necessary to consider the movement of friction pairs, materials, surface roughness, working environment and working conditions, as well as the performance of lubricants. In mechanical equipment, lubricants are mostly distributed by lubrication to the parts that need lubrication.
Q:How can stainless steel pipes and ductile iron pipes be joined?
Or with a gland type expansion joint, by tightening the pressure plate bolts, sealing pipe fittings and pipe wall, so as to achieve sealing, while retractable function
Q:Are ductile iron pipes resistant to alkaline attacks?
Yes, ductile iron pipes are generally resistant to alkaline attacks. Ductile iron is known for its durability and corrosion resistance, making it suitable for various applications including water and wastewater systems. Alkaline substances, such as high pH levels in water or chemicals, can potentially cause corrosion in certain metals, but ductile iron has been specifically designed to withstand these conditions. Its composition, including the addition of alloying elements like nickel and chromium, enhances its resistance to alkaline attacks. Additionally, ductile iron pipes are often lined with protective coatings, such as cement mortar or polyethylene, further enhancing their resistance to alkaline substances. However, it is important to note that the specific resistance of ductile iron pipes to alkaline attacks can depend on factors such as the concentration and duration of exposure to alkaline substances, as well as the presence of other corrosive agents. Therefore, it is always advisable to consult with manufacturers or industry experts to ensure the suitability of ductile iron pipes for specific alkaline environments.
Q:Can ductile iron pipes be repaired if they are damaged?
Yes, ductile iron pipes can be repaired if they are damaged. Various repair methods, such as spot repair or full line replacement, can be employed depending on the extent and nature of the damage. Experienced technicians can assess the damage and determine the most suitable repair technique to restore the functionality and integrity of the ductile iron pipes.
Q:How to properly maintain FRP pipes
It has excellent corrosion resistanceDo not use cathodic protection and other anti-corrosion measures to produce two contamination of water and other media. Long service life of products.
Q:Are ductile iron pipes suitable for power plant applications?
Yes, ductile iron pipes are suitable for power plant applications. Ductile iron is a type of cast iron that has enhanced strength, durability, and flexibility compared to traditional cast iron pipes. These properties make ductile iron pipes ideal for power plant applications where they are exposed to high pressure, extreme temperatures, and corrosive environments. Power plants often require a reliable and robust piping system to transport various fluids such as water, steam, and chemicals. Ductile iron pipes have high tensile strength and can withstand high pressure, ensuring the safe and efficient flow of these fluids within a power plant. Their ability to handle high-pressure steam makes them particularly suitable for power generation applications. Additionally, ductile iron pipes have excellent resistance to corrosion, which is crucial in power plants where many fluids can be highly corrosive. The internal and external linings of these pipes protect them from corrosion, ensuring a longer service life and reducing maintenance costs. This corrosion resistance also makes them suitable for transporting chemicals and wastewater within a power plant. Another benefit of ductile iron pipes is their ability to withstand extreme temperatures. Power plants often operate at high temperatures, and ductile iron pipes can handle these conditions without compromising their structural integrity. They have a high melting point and can resist thermal expansion and contraction, making them suitable for applications involving hot fluids and steam. Furthermore, ductile iron pipes are cost-effective compared to other materials commonly used in power plants, such as stainless steel or carbon steel. They offer a balance between performance and cost, making them an attractive choice for power plant applications. In conclusion, ductile iron pipes are well-suited for power plant applications due to their strength, durability, flexibility, corrosion resistance, and ability to withstand high pressures and extreme temperatures. Their cost-effectiveness further adds to their suitability for power plant piping systems.
Q:How to distinguish flexible and rigid interfaces between cast iron pipe joints
Flexible connections can be kept watertight at any angle (lateral or vertical), and rigid, where the interface of a pipe is easy to crack if a slight earthquake is encountered
Q:Are ductile iron pipes suitable for gravity sewer systems?
Indeed, gravity sewer systems find suitability in the utilization of ductile iron pipes. Numerous properties possessed by ductile iron pipes render them highly compatible with this specific application. To commence, the high tensile strength of ductile iron pipes allows them to endure the weight exerted by the soil and other burdens imposed on them within a gravity sewer system. Consequently, these pipes can effectively resist deformation and maintain their structural integrity over an extended period. Moreover, the exceptional corrosion resistance exhibited by ductile iron pipes proves to be of utmost importance in sewer systems, which are frequently exposed to severe and corrosive surroundings. In this regard, the corrosion resistance of ductile iron pipes guarantees their long-term durability, thereby minimizing the necessity for maintenance and repairs. Additionally, the presence of a smooth internal surface in ductile iron pipes permits the efficient flow of wastewater within gravity sewer systems. A smooth surface reduces friction and prevents the accumulation of debris and sediment, thereby diminishing the likelihood of blockages and enhancing the overall performance of the system. Furthermore, the high resistance of ductile iron pipes to external forces, such as ground movements or heavy traffic, renders them highly dependable for gravity sewer systems where the pipes may encounter various external stresses. In conclusion, the amalgamation of properties encompassing high tensile strength, corrosion resistance, smooth internal surface, and resistance to external forces establishes ductile iron pipes as a suitable and reliable choice for gravity sewer systems.

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