DUCTILE IRON PIPE K8 DN400

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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 to choose a ductile cast iron pipe with guaranteed quality: 1, first of all choose the regular manufacturers of ductile iron pipe products.2, the choice of ductile iron pipe, should be based on the specific circumstances of the construction site, select the pipe and fittings corresponding to the form of interface.3, rubber rings recommend the use of three yuan ethylene propylene rubber ring and so on.4, listen to the voice, knocking the iron: short duration. The iron ball: crisp sound, echo, short duration5, the cutting surface is gray: gray, shiny surface seems very dark, very rough. Ductile iron: gray, gray luster is bright, like gray surface roughness.

Q: What is cast iron pipe?: Cast iron pipes (Cast, Iron, Pipe), cast cast pipe. Cast iron pipes are used for water supply, drainage and gas transmission lines. They include cast iron pipes and pipe fittings. Labor intensity is small. According to the casting method, it is divided into continuous cast iron pipe and centrifugal cast iron pipe, in which the centrifugal cast iron pipe is divided into sand mould and metal type two kinds.

Q: Steel plastic pipe, ductile iron pipe, steel pipe difference: Spheroidal graphite tube, now application has been relatively small, generally used for conveying water, gas at room temperature, low pressure, large diameter pipelines need to produce concrete pipe base, good corrosion resistance than steel pipe joints, vulnerable to external extrusion and leakage, the price is relatively cheap.

Q: How can the ductile iron pipe elbow be fixed?: The groove connecting pipe consists of two categories of products: sealing function of pipe connections with rigid joint, flexible joint, mechanical three and groove flange; the pipe connections transition of elbow, three links, four links, different diameter pipe, blind plate etc..

Q: What's the function of the cement mortar lining of ductile iron pipes?: In brief, the cement mortar lining system has the following advantages:1. provide active protection better than barrier coating2. meet both national and international standards for contact with potable water3. can be used in the strict requirements of the occasion4. strong and shock resistant5. suitable for a wide range of applications6. easy to repair7. over 100 years of service life

Q: How do ductile iron pipes handle cyclic loading in offshore applications?: Ductile iron pipes possess remarkable strength and durability, rendering them suitable for a wide range of applications, including offshore usage. When it comes to dealing with cyclic loading in offshore settings, ductile iron pipes boast various characteristics that contribute to their exceptional performance. To begin with, ductile iron pipes demonstrate a high resistance to fatigue failure. Fatigue failure occurs when a material undergoes repeated stress cycles, leading to the initiation and propagation of cracks over time. Ductile iron pipes are specifically designed to endure cyclic loading without compromising their structural integrity. This is made possible by their inherent ductility and ability to effectively absorb and distribute stress. Furthermore, ductile iron pipes exhibit outstanding impact resistance. Offshore environments are prone to dynamic and unpredictable forces, such as waves and currents, which can exert sudden and intense loads on the pipes. The superior impact resistance of ductile iron allows it to withstand these forces without experiencing deformation or fractures, ensuring that the pipes remain intact and fully functional. Moreover, ductile iron pipes possess a unique microstructure that enables them to resist corrosion. Offshore applications expose pipes to harsh environmental conditions, including saltwater, which can accelerate the corrosion process. However, the protective graphite matrix present in ductile iron pipes acts as a barrier, preventing corrosive agents from reaching the underlying metal. As a result, the service life of the pipes is significantly prolonged. Additionally, ductile iron pipes have a high load-carrying capacity. In offshore applications, pipes often need to support heavy loads, such as those exerted by equipment, structures, or seabed settlements. The exceptional strength of ductile iron enables it to effectively bear these loads, ensuring the structural integrity and stability of the entire system. Lastly, ductile iron pipes offer ease of installation and maintenance. Their lightweight nature makes them easier to handle and transport during offshore operations. Furthermore, their corrosion resistance reduces the need for frequent maintenance, minimizing downtime and reducing the costs associated with repairs and replacements. In conclusion, ductile iron pipes exhibit excellent performance when it comes to handling cyclic loading in offshore applications. Their resistance to fatigue failure, impact resistance, corrosion resistance, high load-carrying capacity, and ease of installation and maintenance make them a dependable and efficient choice for offshore environments.

Q: Are ductile iron pipes resistant to chloride-induced corrosion?: Yes, ductile iron pipes are generally resistant to chloride-induced corrosion due to their protective coating and inherent chemical composition. However, the level of resistance may vary depending on the specific environment and concentration of chlorides present. Proper maintenance and regular inspections are still important to ensure long-term durability and prevent any potential corrosion issues.

Q: How does ductile iron pipe compare to steel pipe in terms of durability?: Ductile iron pipe and steel pipe possess distinct characteristics, but when it comes to durability, ductile iron pipe holds several advantages over its steel counterpart. To begin with, ductile iron pipe boasts exceptional resistance to corrosion. It incorporates a protective layer of zinc or cement lining that safeguards it against rust and corrosion, enhancing its durability and reducing the likelihood of leaks or failures. Conversely, steel pipe is vulnerable to corrosion, particularly when exposed to moisture or specific chemicals. This susceptibility can lead to structural problems and diminish its overall durability. Furthermore, ductile iron pipe exhibits remarkable impact resistance. It can endure substantial loads and external pressures without cracking or breaking, rendering it suitable for applications in high-traffic areas or situations where the pipe may be subject to accidental impacts. Steel pipe, despite its strength, can be more brittle and prone to fractures under similar circumstances. Moreover, ductile iron pipe boasts a longer service life compared to steel pipe. With proper maintenance, it has been known to endure for over a century, making it a dependable and long-lasting choice for infrastructure projects. Steel pipe, although still durable, may necessitate more frequent inspections and maintenance to ensure its longevity. In conclusion, ductile iron pipe surpasses steel pipe in terms of durability due to its corrosion resistance, impact resistance, and extended service life. Nevertheless, the selection between the two ultimately depends on the specific application, budgetary constraints, and other project requirements.

Q: How do ductile iron pipes perform in high-velocity water flow conditions?: High-velocity water flow conditions are easily handled by ductile iron pipes. Their composition and manufacturing process give them remarkable strength and durability, making them highly resistant to the forces generated by fast-flowing water. These pipes are specifically designed to endure significant hydraulic pressure and turbulent conditions. Their inherent ductility allows them to absorb the energy of the flowing water and effectively dissipate any potential stress or impact that may arise. Furthermore, the smooth internal surface of ductile iron pipes reduces frictional losses, ensuring efficient water flow even at high speeds. This characteristic is vital in maintaining the necessary water pressure and flow rates in various applications, including water distribution systems, sewage networks, and industrial processes. Additionally, the corrosion resistance of ductile iron pipes enhances their performance in high-velocity water flow conditions. Typically, these pipes are lined with cement mortar or polyethylene, providing extra protection against the corrosive effects of fast-flowing water. In summary, ductile iron pipes are perfectly suited for high-velocity water flow conditions, offering exceptional strength, durability, and hydraulic efficiency. Their ability to withstand the challenges posed by fast-flowing water makes them a reliable choice for a wide range of applications where high water velocity is a concern.

Q: Can ductile iron pipe be used for municipal water supply?: Indeed, municipal water supply systems have extensively relied on ductile iron pipe for numerous years, owing to its exceptional durability, strength, and corrosion resistance. Its suitability for underground use is evident in its ability to endure high pressure and substantial loads. Moreover, ductile iron pipe boasts an extended lifespan, often surpassing 100 years, making it a fiscally prudent option for municipal water supply systems. In summary, ductile iron pipe serves as a dependable and prevalent material for guaranteeing the secure and effective transportation of water to communities.

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