DUCTILE IRON PIPES C Class DN800

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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 are the differences between ductile cast iron pipes and centrifugal ductile iron pipes?
Centrifugal casting is a casting method. Ball milling cast iron pipe is a kind of material.
Q:Principles for the antiseptic treatment of ductile iron pipes
Anti corrosion process of ductile iron pipe:1. asphalt paint coatingBituminous paint coatings are pipes used to carry gas. Preheating the pipe before spraying can improve the adhesion of asphalt paint and accelerate drying.2. cement mortar lining + special coatingThe internal corrosion prevention measures are suitable for pipes conveying sewage, and the corrosion resistance of lining can be improved.3. epoxy coal tar coatingThe epoxy coal tar coating is not only suitable for gas pipelines, but also for sewage pipes. It is a two component coating with a high adhesion and a very smooth surface
Q:What if the ductile iron pipe is broken?
Ductile cast iron pipes are broken because of the excessive heat treatment during casting or the lack of proper addition in casting to prevent the proper change of the proper brittleness and cause the rupture to be effective.
Q:Ductile iron pipe length is generally much
6 meters, the bassoon is also 8 meters!
Q:What is the DN400 installation charge for ductile iron pipes?
Labor cost: refers to the total amount of wages according to the provisions of the payment to the construction and installation works in the production of workers and ancillary production units of workers costs.
Q:What is the acceptance of cast iron pipe material?
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. Divided into gray cast iron pipe and nodular cast iron pipe according to different material.
Q:Why does the cast iron pipe always run off when testing?
The pipeline is installed, straight section of each pipe will be added pier, concrete pipe, elbow, three links should also have concrete pier, specific installation method according to GB Atlas 03SS515, and the straight pipe to soil, pipeline interface will be exposed, easy to check.
Q:What are the requirements for the hydrostatic test of ductile iron pipes?
The hydraulic pressure test shall be carried out in the backfill before trying to allow the pressure after passing the backfill, backfill, the graded gravel fill to 300mm above the top of pipe, and then the soil backfill, backfill process by 200~300 tamped pipeline above 500mm within more than 500 can be used in artificial ramming, mechanical compaction. The degree of compaction shall not be less than 0.93.
Q:What is the excavation width of ductile iron pipes with diameters greater than 1400?
Because of differences in depth and soil properties, the excavation width is differentUsually to ensure that the width of bottom surface on both sides of the 600 1400+ manual operation. (such a large pipe flange bolt, the tool is not easy to expand, so the need for manual operation. So wide)
Q:Why is the cast iron tube lined with cement? Under what circumstances are ductile iron pipes lined with cement, and under what circumstances do not have to be lined with cement?
The cement lining protects the water quality, reduces the head loss and improves the service life of the spheroidal graphite pipe. As long as the water delivery hose is used, the cement lining must be used. There is no lining cement for conveying air.

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