DUCTILE IRON PIPES C Class DN1000

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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.


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Q:Which direction should the spigot of the K9 ductile iron pipe be installed?
Ductile iron pipes mainly called centrifugal ductile iron pipe, it has the properties of nature, iron and steel, excellent corrosion resistance, good ductility, good sealing effect, simple installation, mainly for municipal, industrial and mining enterprises, water supply, gas, oil etc.. Water supply pipe is the first choice, with high cost performance.
Q:Ductile iron pipe connection mode
Jack painted on the outer surface and rubber lubricant: lubricant evenly installed ring inner surface, outer surface coating in the socket to socket socket parts lubricant line all the brush in the socket.
Q:Does centrifugal cast iron pipe work well with lining cement? Will it scale and breed bacteria?
The situation in use abroad seems. It is considered that the corrosion of the inner wall of the centrifugal centrifugal ductile iron pipe and the rupture of the pipe are easy to occur when the content of chloride ion exceeds 5O0PPm in the pipe laying environment. This is mainly because, because the cement paste protection layer is the late spraying construction, it is not good to combine with the prefabricated core tube. It often causes water or moisture to seep in and causes oxidation and corrosion of the prestressing steel bars, resulting in fracture. The adhesive interface between cement mortar and centrifugally cast iron pipe is not reasonable. Because of the water absorption of cement, when the water enters the pipe, it is easy to destroy the interface and corroded the inner wall of the centrifugally cast iron pipe. Because it is a brittle material, it is easy to cause sudden accidents.
Q:What quota can be used for the installation of DN300 ductile iron pipes?
Moreover, the ball tube is generally 5.5 meters long or 6 meters, if the length of the bridge is too long, to use the casing, the casing must also be fixed, and so on.
Q:DN300 what's the price of the ductile iron pipe / the weight and the price of one meter?
Ductile iron pipe is a kind of cast iron. It is an alloy of iron, carbon and silicon.
Q:What's the function of the cement mortar lining of ductile iron pipes?
You may easily say that this statement is vague and there is no evidence that other manufacturers often do so when promoting other types of lining. However, in order to prove the truth of the above view, we have compiled sufficient examples to demonstrate the reliability of each of these statements from a scientific and logical point of view.We have stated each of these fields and other embedded systems as specious statements. There is only a reasonable conclusion that the cement mortar lining (CML) provides excellent protection for ductile iron pipes and steel tubes.Ductile iron pipe and steel pipe CML CML produces a synergistic effect of the incomparable.
Q:Is ductile iron pipe breakable?
1 、 the drainage pipe is easy to fold. Folding is formed on the surface of various drainage pipe line, the longitudinal defects often throughout the entire product;2, poor drainage pipe surface prone to scarring;3, inferior drainage pipe, no metallic luster, is pale red or similar to the color of pig iron;4, inferior drainage pipe easily scratch, because the inferior material manufacturers equipment is simple, easy to produce burr, scratches the drainage pipe surface. Deep scrape reduces the strength of the ball drain;
Q:Ductile iron pipes lined with cement mortar in the water (living water, water in the 6.9-7.3) in the early pH, why pH increased? How to solve this problem?
1, because of the bone in mortar, such as silicate products, there will be silicification reaction, in addition, there is the reaction of limestone in lime.2, cement mortar lining cover coating, that is, spray some paint! Some questions four are unavoidable
Q:What are the requirements for the hydrostatic test of ductile iron pipes?
Hydraulic test of pipeline segment length should not be more than 1 kilometers, the test pipe should be in full of water, no pressure under the condition of full immersion, soaking time of ductile cast iron pipe without mortar lining not less than 24 hours, a mortar lining the immersion of not less than 48 hours.
Q:General cast iron prices now
Regular cast iron prices now range between 5000 and 8000.Ductile iron is a kind of high strength cast iron material developed in 50s twentieth Century, its comprehensive performance is close to the steel, it is based on its excellent performance, has been successfully used in casting complex stress, strength, toughness and wear resistance requirements of the higher parts. Nodular cast iron has developed rapidly to be second only to grey cast iron and widely used as cast iron material. The so-called "iron instead of steel", mainly refers to ductile iron.

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