DUCTILE IRON PIPES K8 DN300

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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 railway crossings?: Yes, ductile iron pipes can be used for railway crossings. Ductile iron is a strong and durable material that can withstand heavy loads and high traffic volumes, making it suitable for railway crossings. Additionally, it has excellent corrosion resistance properties, which is important for withstanding the harsh environmental conditions associated with railway crossings.

Q:Can ductile iron pipe be used for wastewater treatment plant applications?: Yes, ductile iron pipe can be used for wastewater treatment plant applications. Ductile iron pipes have several properties that make them suitable for such applications. Firstly, ductile iron is highly resistant to corrosion, which is crucial in wastewater treatment plants where the presence of chemicals and water can lead to rust and degradation of pipes. Additionally, ductile iron pipes have high tensile strength and durability, making them able to withstand the demands of wastewater treatment processes. Furthermore, ductile iron pipes are also known for their flexibility, which allows for easy installation and maintenance in complex wastewater treatment systems. Overall, ductile iron pipe is a reliable and cost-effective choice for wastewater treatment plant applications.

Q:How do ductile iron pipes handle heavy traffic loads?: Ductile iron pipes are extremely durable and can handle heavy traffic loads with ease. This is due to their exceptional strength and flexibility. The composition of ductile iron, which includes graphite nodules, allows the material to be more flexible than traditional cast iron pipes. This flexibility enables the pipes to withstand heavy traffic loads, including the weight of vehicles passing over them. Additionally, ductile iron pipes have a high load-bearing capacity, which means they can support substantial weights without experiencing deformation or structural failure. This makes them suitable for use in areas with heavy traffic, such as highways, bridges, and industrial sites. Furthermore, ductile iron pipes have excellent resistance to external forces, such as vibrations and impacts. They can absorb and distribute these forces throughout the pipe network, preventing damage and maintaining structural integrity. In summary, ductile iron pipes are specifically designed to handle heavy traffic loads. Their strength, flexibility, and load-bearing capacity make them a reliable choice for infrastructure projects where durability and longevity are essential.

Q:Why is the sound speed of nodular cast iron lowered after heat treatment?: This may be the material microstructure changes after heat treatment, is generally the pearlite content increased, the available change heat treatment and then check the corresponding microstructure and corresponding measuring sound velocity adjustment, such as annealing, normalizing etc..

Q:Do rigid cement cast iron pipes need cement piers?: Ductile weakness: ductile cast iron pipes connected by human factors such as the operation level of responsibility, influence, construction not convenient. The advantages of PE PE PE pipe has good corrosion resistance and its anti inorganic performance than that of the metal pipe is much stronger in the buried without corrosion, construction convenient. Small diameter PE pipe in the price performance ratio is better than that of steel and ductile iron.PE tube have disadvantages: benzene, gasoline, carbon tetrachloride and other organic solvents have certain effect on pe. If the organic solvent is infiltrated into the polyethylene, the swelling will occur, and its physical properties will be decreased. Its pressure resistance and temperature resistance are poor.

Q:Are ductile iron pipes suitable for underground storage tanks?: Ductile iron pipes are indeed suitable for underground storage tanks. Ductile iron is a strong and durable material that is highly resistant to corrosion and can withstand the pressure and weight of being buried underground. These pipes are widely used in various underground applications, including water and sewage systems, as they have excellent tensile strength and can handle both internal and external loads. Moreover, ductile iron pipes have a long service life, often exceeding 100 years, making them a reliable choice for underground storage tanks. They are also resistant to ground movement and can adapt to soil settling or shifting, ensuring the integrity and stability of the storage tank system. Additionally, ductile iron pipes provide excellent flow characteristics due to their smooth internal surface, preventing the accumulation of debris or sediment that could potentially clog the system. This makes them an ideal choice for storing various liquids or substances. Overall, the strength, durability, corrosion resistance, and long service life of ductile iron pipes make them a suitable and reliable option for underground storage tanks.

Q:How does ductile iron pipe perform in areas with high seismic activity?: Ductile iron pipe possesses exceptional strength and durability, making it an ideal choice for areas with high seismic activity. Seismic events, such as earthquakes, can exert significant stress and strain on pipelines, leading to rupture or failure. However, ductile iron pipe's unique material properties enable it to withstand these dynamic forces. One of the main advantages of ductile iron pipe in seismic regions is its remarkable flexibility. Unlike rigid materials like cast iron or steel, ductile iron exhibits a higher degree of elasticity. This allows it to deform and absorb energy during seismic events, dissipating the seismic forces and reducing the risk of pipe failure. Consequently, damage to the overall pipeline system is minimized. Furthermore, ductile iron pipe is manufactured with a high level of ductility, meaning it can undergo substantial deformation without fracturing. This characteristic is particularly crucial in seismic zones as it enables the pipe to endure ground movements and seismic waves without compromising its structural integrity. Additionally, the ability of ductile iron to absorb and redistribute stress helps prevent localized failures, ensuring the pipeline system's overall stability and reliability. Additionally, ductile iron pipe possesses excellent corrosion resistance, which is especially vital in high seismic areas where ground movement and subsequent water leaks can compromise the pipe's integrity. The corrosion resistance of ductile iron ensures the longevity and reliability of the pipeline system, minimizing the risk of leaks or failures during seismic events. In conclusion, ductile iron pipe performs exceptionally well in areas with high seismic activity due to its superior flexibility, high ductility, and corrosion resistance. These properties allow the pipe to withstand the dynamic forces generated during seismic events, providing a reliable and long-lasting solution for fluid transportation and ensuring the safety of communities in earthquake-prone regions.

Q:What is the expected external protection system for ductile iron pipes?: Typically, a combination of coatings and cathodic protection is used to provide external protection for ductile iron pipes. These coatings, such as fusion-bonded epoxy (FBE) or polyethylene, are applied to the pipe's outer surface to create a barrier against corrosion and shield it from the surrounding environment. They have high resistance against moisture, chemicals, and abrasion, ensuring the longevity of the pipe. Furthermore, cathodic protection is often employed along with coatings to enhance the external protection of ductile iron pipes. This involves using sacrificial anodes or impressed current systems to generate a protective electrical current that counteracts the corrosive effects on the pipe's surface. By maintaining the ductile iron in a cathodic state, where it is less prone to degradation, this technique helps prevent corrosion. The combination of coatings and cathodic protection offers a robust and comprehensive external protection system for ductile iron pipes. These measures effectively safeguard the pipes from corrosion, resulting in extended service life and reduced need for expensive repairs or replacements. Regular inspection and maintenance are also crucial to ensure the ongoing effectiveness of the external protection system and to promptly address any potential issues.

Q:How are ductile iron pipes protected against internal corrosion caused by chemicals?: Ductile iron pipes are protected against internal corrosion caused by chemicals through a combination of several protective measures. Firstly, these pipes are usually lined with a cement mortar lining or an epoxy coating. This lining acts as a barrier between the chemical substances in the water or sewage and the iron material of the pipe, preventing direct contact and corrosion. In addition to the lining, a corrosion-resistant polymer or bituminous coating is often applied to the exterior of the ductile iron pipes. This coating serves as an extra layer of protection, safeguarding the pipe against any external chemical exposure that may occur. Furthermore, cathodic protection is commonly employed to prevent internal corrosion. This technique involves the use of sacrificial anodes, typically made of zinc or magnesium, which are attached to the pipe. The anodes corrode over time instead of the iron, effectively sacrificing themselves to protect the pipe from corrosion caused by chemicals. Regular maintenance and monitoring of the ductile iron pipes are also crucial in preventing and addressing any potential corrosion issues. This includes routine inspections, cleaning, and repairing any damaged or corroded areas promptly. Overall, the combination of lining, external coating, cathodic protection, and maintenance practices ensures that ductile iron pipes are well-protected against internal corrosion caused by chemicals, prolonging their lifespan and ensuring the integrity of the pipeline system.

Q:How is ductile iron different from cast iron?: Ductile iron is different from cast iron in terms of its composition and mechanical properties. While both are types of iron alloys, ductile iron contains small amounts of additional elements, such as carbon, silicon, and magnesium, which enhance its strength, ductility, and impact resistance. This makes ductile iron more flexible and less brittle compared to cast iron. Additionally, ductile iron has a higher tensile strength and can withstand higher pressure and stress, making it suitable for applications where cast iron may fail.

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