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:Can ductile iron pipes be used for both water and sewage systems?: Yes, ductile iron pipes can be used for both water and sewage systems. Ductile iron pipes are known for their strength and durability, making them suitable for various applications. They have excellent resistance to corrosion and can withstand high pressures, making them ideal for transporting both water and sewage.

Q:Can ductile iron pipe be used for trenchless installation methods?: Trenchless installation methods, such as horizontal directional drilling (HDD) or pipe bursting, are capable of utilizing ductile iron pipe. These techniques allow for the installation of underground utilities with minimal excavation and disturbance to the surrounding environment. Ductile iron pipe is particularly well-suited for these methods due to its inherent strength, durability, and flexibility. It can withstand the forces and stress associated with trenchless installation, including the pulling forces during HDD or the bursting forces during pipe bursting. Furthermore, ductile iron pipe's corrosion resistance eliminates the need for protective coatings when installed underground. Consequently, ductile iron pipe is a dependable choice for trenchless installation methods.

Q:Are ductile iron pipes suitable for use in hydroelectric dams?: Hydroelectric dams benefit from the suitability of ductile iron pipes. Ductile iron, a more flexible and stronger type of iron compared to traditional cast iron, is an ideal option for various applications, including water transmission systems in hydroelectric dams. Ductile iron pipes possess durability and resistance to corrosion, which is essential in the continuous water exposure environment of a dam. They can endure high pressures and extreme temperatures, making them fitting for the demanding conditions within hydroelectric dams. Moreover, ductile iron pipes exhibit excellent joint integrity, guaranteeing their leak-proof and reliable performance throughout their lifespan. This aspect is crucial for maintaining the efficiency and effectiveness of a hydroelectric dam's water transmission system. Additionally, ductile iron pipes prove to be cost-effective when compared to materials like steel or concrete. With a long service life, minimal maintenance requirements, and easy availability, they present a practical choice for hydroelectric dam projects. In conclusion, ductile iron pipes are a viable option for hydroelectric dams due to their durability, corrosion resistance, high-pressure tolerance, joint integrity, and cost-effectiveness. They provide the necessary strength and flexibility to efficiently transport water within the dam, contributing to the overall success and longevity of the hydroelectric power generation system.

Q:What is the use of ductile iron?: As far as the tonnage is concerned, the automotive industry is the second largest producer of ductile iron castings, with the largest number of them. Ductile iron is used in three main parts of automobiles: (1) power source, engine parts; (2) power transmission of a gear train, gears and bushings; (3) vehicle suspension, brakes and steering gear. The power source is subjected to continuous change of the crankshaft bending, torsion and shear load, and in its service life, to one billion cycles of car design engineers early in the 19152 years that the processing method for magnesium found in four years later, immediately consider the possibility of using ductile iron. Almost all crankshafts of Ford motor are made of this material. Most gasoline engines in the world are fitted with ductile iron crankshafts instead of forged steel crankshafts, which are considered a typical example of value engineering.

Q:How do ductile iron pipes handle thermal expansion and contraction?: Ductile iron pipes are known for their excellent ability to handle thermal expansion and contraction. This is mainly due to their unique composition and design which allows them to withstand changes in temperature without experiencing significant damage or deformation. Thermal expansion occurs when a material expands due to an increase in temperature, while thermal contraction refers to the contraction that occurs when a material cools down. Ductile iron pipes can effectively accommodate these changes in temperature by utilizing their inherent flexibility and strength. One of the key factors that enable ductile iron pipes to handle thermal expansion and contraction is their high ductility, which refers to their ability to deform without breaking. This ductility allows the pipes to absorb the expansion and contraction forces without cracking or rupturing. Moreover, the composition of ductile iron pipes includes graphite nodules, which act as microcracks that can absorb stress and prevent the material from fracturing. This unique microstructure enhances the pipes' resistance to thermal expansion and contraction. In addition, ductile iron pipes are often designed with joints that allow for limited movement. These joints, such as mechanical joints or push-on joints, can accommodate the expansion and contraction of the pipes by providing a certain degree of flexibility. This helps to prevent the pipes from becoming overstressed or damaged. Overall, ductile iron pipes are specifically engineered to handle thermal expansion and contraction effectively. Their high ductility, unique microstructure, and joint design make them a durable and reliable choice for applications where temperature variations are expected.

Q:What is the cost of ductile iron pipe compared to other pipe materials?: The cost of ductile iron pipe compared to other pipe materials can vary depending on various factors such as the size, length, and specific requirements of the project. However, generally speaking, ductile iron pipe tends to be more expensive than some of the alternative pipe materials such as PVC or HDPE (high-density polyethylene) pipes. Ductile iron pipe is known for its exceptional strength and durability, making it suitable for a wide range of applications including water distribution, wastewater systems, and industrial piping. Its robustness and longevity contribute to its higher cost compared to other pipe materials. On the other hand, PVC and HDPE pipes are often more affordable options due to their lower production and material costs. Additionally, these materials are lightweight, easy to install, and resistant to corrosion, which can lead to cost savings during installation and maintenance. It is important to note that while ductile iron pipe may have a higher upfront cost, its superior strength and longevity can result in long-term cost savings by minimizing the need for frequent repairs or replacements. The choice of pipe material should be made considering the specific project requirements, budget constraints, and the anticipated lifespan of the infrastructure.

Q:What is the expected internal lining material for ductile iron pipes?: The expected internal lining material for ductile iron pipes is typically cement mortar or polyethylene.

Q:How does ductile iron pipe perform in areas with high groundwater levels?: Ductile iron pipe performs exceptionally well in areas with high groundwater levels. One of the key advantages of ductile iron pipe is its corrosion resistance, which makes it highly suitable for underground applications and areas with high water tables. Unlike other materials, ductile iron pipe is not susceptible to rust or corrosion caused by groundwater, ensuring its durability and longevity. Furthermore, ductile iron pipe has excellent strength and flexibility, allowing it to withstand the external pressure exerted by high groundwater levels. It can resist the buoyant forces exerted by water, preventing it from floating or shifting out of place. In addition, ductile iron pipe's joints are tightly sealed, preventing any groundwater from infiltrating the pipe system. This ensures that there is no leakage or contamination of the water supply, which is crucial in areas with high groundwater levels. Overall, ductile iron pipe is the ideal choice for areas with high groundwater levels due to its corrosion resistance, strength, and ability to maintain a tight, secure system. It provides a reliable and long-lasting solution for water distribution and sewer systems, even in challenging environments.

Q:What effect does magnesium play in nodular cast iron?: The role of magnesium as spheroidizing agent used in iron spheroidizing treatment, promote water ink is made of iron, carbon in liquid iron spherical graphite precipitation.

Q:What are the different types of ductile iron pipe joints?: There are several types of ductile iron pipe joints, including push-on joints, mechanical joints, restrained joints, flanged joints, and grooved joints.

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