DUCTILE IRON PIPESC Class 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.


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Q:What is the difference between flexible joint mechanism and seismic cast iron pipe DN100 and ductile iron pipe?
The ball compressive strength of ductile iron pipe is much higher than that of cast iron pipes, buried in the ground, the car is not easy to be crushed.
Q:Is there any cast iron pipe used in the fire hose?
I do not know, are generally seamless steel pipe or spiral pipe, straight seam pipe.
Q:Advantages and disadvantages of ductile iron pipes?
Ductile iron pipes are widely used for municipal water supply and drainage, rural drinking water and outdoor fire fighting works; mechanisms; cast iron pipes; main use; municipal high water drainage.
Q:What's the advantage of FCD50 ductile iron?
Ductile iron generally large diameter, pipe wall thickness, crisp texture, low strength, low price, is an economic water supply pipe, the normal service life of up to 20~25 years.
Q:What is the DN400 installation charge for ductile iron pipes?
The wages paid under special circumstances: refers to the provisions of the state laws, regulations and policies, due to illness, injury, maternity leave, family planning leave, funeral leave, leave, leave, leave, regular shutdown, implementation of national or social obligations due to pay a certain percentage of wage hourly wage or salary when.
Q:The difference between flexible joint cast iron pipe and flexible anti-seismic cast iron pipe
Tracking the world's advanced technology comprehensive introduction pipe, steel pipe, cast iron pipe and other pipe fittings, practical production process, technical performance and quality requirements. Data detailed, authoritative concrete. Instructive and practical.
Q:There are several forms of flexible interfaces for Spigot Cast Iron Pipes
Japan's Kubota ductile mechanical interface, in recent years has been introduced to China. As in the Beijing water pipeline construction from the Miyun reservoir to the Huairou reservoir, the use of a large number of nodular type DN2600mmK mechanical interface of cast iron pipe.The mechanical interface of ductile iron pipe is divided into A and K. The tubes and fittings are made of ductile iron, straight pipes, screws, bolts and rubber rings.The mechanical interface has good sealing performance. When the water pressure reaches 2MPa in the test, there is no leakage. The axial displacement and the angle of folding all reach a high level, but the cost is higher.
Q:Deep well spiral iron pipe, or ductile iron tube?
In the ferrite and pearlite matrix on the distribution of a certain number of spheroidal graphite, according to the nominal diameter and the elongation of different microstructure of ferrite and pearlite in different proportions of small caliber pearlite percentage is generally not more than 20%, large diameter of the general control in about 25%.
Q:How to properly maintain FRP pipes
It has excellent corrosion resistanceDo not use cathodic protection and other anti-corrosion measures to produce two contamination of water and other media. Long service life of products.
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.

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