DUCTILE IRON PIPE C Class DN700

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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:Ductile iron and gray iron is what are the advantages and disadvantages of it
Comparison of ductile iron and cast iron (gray iron)Compared with cast iron, ductile iron has an absolute advantage in strength. The tensile strength of ductile iron is 60K, while the tensile strength of cast iron is only 31k. The yield strength of ductile iron is 40K, while the cast iron does not show yield strength, and eventually breaks. The strength to cost ratio of ductile iron is far superior to that of cast iron. Ductile iron is the same as cast iron in corrosion resistance.
Q:How can the ductile iron pipe be tested?
In the hydraulic test, the ductile iron pipe can not be close to the back, support, pipe end and so on. The inspection must be carried out after all stops
Q:What is the relationship between the installation direction of the ductile iron pipe and the direction of flow?
Suppose the water flows from east to west, then the pipe mouth is in the East socket at the West
Q:How can the ductile iron pipe depress the elbow so as to prevent it from being opened?
The way to connect with the pipe is: direct welding (the most commonly used way), flange connection, hot melt connection, electric melting connection, threaded connection and socket connection. According to the production process can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, etc..
Q:What are the risks in the process of conveying ductile iron pipes?
Lifting: be careful lifting pipe, don't let the pipe shaking, lifting pipe by wire rope, sling and special sling, wire rope no single, for the protection of pipe coating, rubber or similar materials can be used to wrap up the rope. The use of hook, for the protection of the cement lining layer is not damaged, will hook with rubber or similar material wrapped up, especially in the hoisting of large diameter pipe, will not be fixed in the socket with hook in end strip or pipes.
Q:Which is good for water polo cast iron pipe steel pipe?
In summary, if the demand is not high, the use of stable environment, pressure and vibration is not a place recommend the use of ductile iron pipe; if is an important facility for high requirements or site conditions, abnormal conditions, vibration and impact may be relatively large, with ordinary seamless steel tube.
Q:Ductile iron pipe joint damage, water leakage, want to see the connection with other pipe fittings, how to operate?!
The ductile iron pipe can be used as the plugging device for the big part
Q:How can the cast iron pipe be connected?
Depends on what type of, A type with flange connection, W type stainless steel band clamp connection
Q:Is the ambient temperature at minus 20 degrees better with grey cast iron or ductile iron?
Ductile iron is good, its tensile properties are destined to withstand low temperatures, gray cast iron is a little bit worse.
Q:The difference between cast iron pipe and ductile iron pipe
I don't understand your question! Both have spigot and socket connection type pipe material, also have flange,

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