DUCTILE IRON PIPE K9 DN450

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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 relationship between continuous cast iron pipe and ductile iron pipe?
In general, the continuous cast iron pipe is the continuous casting of gray cast iron pipe, while the centrifugal cast iron pipe is centrifugal ductile iron pipe. Of course, you have to be hard, just to make continuous ductile iron pipes, that's what you want.
Q:Is it better to use steel tubes or ductile iron pipes for water supply?
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:How to distinguish flexible and rigid interfaces between cast iron pipe joints
Flexible connections can be kept watertight at any angle (lateral or vertical), and rigid, where the interface of a pipe is easy to crack if a slight earthquake is encountered
Q:The difference between ductile iron pipe and steel pipe used in pipe jacking
Comparison between ductile iron pipe and universal cast iron pipe: the process of making ductile iron pipe is cast by adding alkaline earth metal or rare metal such as magnesium and calcium in the raw material of common cast iron pipe.
Q:What are the advantages and disadvantages of spheroidal graphite cast iron?
Therefore, ductile iron pressure containing parts are treated with a ferritizing annealing cycle, the globular structure of ductile iron internal can also eliminate the crack phenomenon of iron easy to produce graphite flakes within the. In microscopic photographs of ductile iron, cracks can be seen and terminated after the parade of graphite balls. In the ductile iron industry, these graphite balls are called "crack terminator" because they have the ability to prevent fracture.
Q:What is cast iron pipe?
According to its manufacturing methods can be divided into: sand, centrifugal pipe, straight pipe, continuous cast iron pipe and sand pipe.According to the material used, it can be divided into gray iron pipe, nodular cast iron pipe and high silicon iron pipe.
Q:Ductile iron gears are generally treated without heat treatment
Heat treatment must be necessary, generally annealed first to machine, after quenching or nitriding treatment
Q:Is the water cast iron pipe 100% for hydrostatic test?
As long as it's a water pipe, it must be tested. Otherwise, how do you know it leaks?.
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:Ductile iron pipe is flexible pipe or rigid pipe
The flexible tube and you say should refer to the common steel pipe and seamless steel pipe, because the two are by the simple method according to the needs and the deformation, in other words, ductile iron is cast out without deformation.

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