DUCTILE IRON PIPE K8 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:Will the cast iron pipes rust?
Qualified ductile iron pipe requires lining standard cement. The outer wall of pipe needs spraying zinc treatment and asphalt paint coating, and other epoxy resin paint can also be selected.
Q:The difference between HDPE pipe and ductile iron pipe
Different appearance, ductile iron pipe single length of 6 meters, large wall thickness; mechanism cast iron pipe single length of 3 meters, the wall thickness is thin.
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 is the ductile cast iron pipe
Should not have this conceptI make the ductile iron pipe, haven't heard of this thing only ductile iron pipe, ductile cast iron heard tube
Q:How to correctly measure ductile iron pipe
The outer diameter of the ball tube is measured around the outer edge of the pipe. The caliper is used to measure the inside diameter of the pipe. The length of the pipe is measured by a ruler or tape measure,
Q:Why is the sound speed of nodular cast iron lowered after heat treatment?
Sound travels faster in a solid than it does in a liquidOr so, after heating, the intermolecular repulsion decreases, so that the same potential energy conduction requires molecules to move more distances, making the transmission slower
Q:Which is good for water polo cast iron pipe steel pipe?
The advantage of ductile iron pipe is cheap, corrosion resistance, lack of toughness is poor, not easy to process
Q:Fire water supply network adopts ductile iron pipe, the test pressure should be no more than MPa
Strictly speaking: the outer pipe network and the internal pipe network are the same. Minimum fire 1.0MPa, minimum sprinkler 1.4MPa. Because not only in accordance with the water pump, but also take into account the pressure on the fire engine.
Q:What does ductile iron pipe "ND200" mean?
Generally speaking, the diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter. The pipe is a seamless steel pipe pipe diameter by the letter D to represent, then additional outer diameter size and thickness, such as diameter of seamless steel pipe 108, a wall thickness of 5MM, denoted by D108*5, is also used outside said, such as De63 plastic pipe, such as reinforced concrete pipe, cast iron pipe, galvanized steel pipe, said the DN, in the design drawings is generally used to represent the nominal diameter, nominal diameter is a standard in order to design and manufacture and maintenance convenient set artificially, with nominal diameter, tube (or pipe) specification name.
Q:Will the quality of ductile iron shrink?
This is a ductile iron is prone to problems, manhole covers, large flat pieces, you have to see clearly, and some appear to be concave, not shrink, it may be caused by large gas emissions, not out

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