DUCTILE IRON PIPE C Class DN100

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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:What's the function of the cement mortar lining of ductile iron pipes?
Active protection is superior to barrier coating, cement mortar lining, and a stable hydroxide film formed on the surface of ductile iron and steel pipe to form a protective layer. This kind of protective coating has excellent antiseptic properties because they spontaneously protect themselves even in discontinuous linings. A polymer in sharp contrast, such as an epoxy lining, is also barrier coating, but only if 100% is applied without leakage. Any interruption or leakage will cause corrosion.It has been documented that cement mortar and cement mortar have been applied to the field of water transportation and can meet the water quality standards for a long time. Some standards still apply to the world. Cement mortar does not support microbial growth. In the case of corrosive water or low flow rate (prolonged stagnation), it is better to use cement mortar lined pipes because it can maintain high pH values in the pipe. This does not cause health problems and can be prevented by very simple sealed coating methods. The natural characteristics of the sealing coating provide the best protection for the inner wall of the pipe, while ensuring that all the water quality indexes meet the quality requirements, low cost and high efficiency.
Q:Is the crankshaft material forged or ductile iron?
Other crankshafts are not clear about the car crankshaft. These two materials are useful, but the trend is to use ductile iron
Q:Can the sealing ring of ductile iron pipe be reused?
It is better not to have used things, easy aging, sealed, the best to use new
Q:What pipe can be used to replace the cast iron pipe in the water supply? Thank you
You are mistaken in concept. The cast iron pipe is the sort of connection method. The ductile iron pipe is classified according to the material.
Q:How can the ductile iron pipe be tested?
The pipeline of water supply pipeline in winter pressure test, must have the corresponding prevention measures, antifreeze, then should give water pipes in the filling should be appropriate in some high, then the protective material for a little more to the interface covered.
Q:Fire water supply network adopts ductile iron pipe, the test pressure should be no more than MPa
To your selected fire pump highest lift 1.5 times to suppress, generally not more than 1.6MPa, if the use of ductile iron pipe, test pressure according to 2MPa to suppress.
Q:What does ductile iron pipe "ND200" mean?
The tube is thin from the metal tube, and the outer diameter of the tube is almost the same as the inner diameter of the tube, so the average value of the outer diameter of the tube and the inner diameter of the pipe is called the diameter.
Q:How can the ductile iron pipe be welded?
The nickel electrode cold welding, such as Z408
Q:Is the ambient temperature at minus 20 degrees better with grey cast iron or ductile iron?
Heavy thermal and mechanical shock, high temperature or low temperature, corrosion resistance and dimensional stability. To meet these changes in use conditions, ductile iron is available in many grades, providing a wide range of mechanical and physical properties.
Q:How much is the manual installation fee of ductile iron pipes from 100 to 150 per metre?
According to the various connection modes after the installation of artificial fee at =8.7~9.0 yuan (about /M this is pure artificial installation fee, no other costs to calculate, if packet labor costs and construction should be appropriately increased when installed).

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