DUCTILE IRON PIPES K8 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 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:Method for cutting cast iron pipe
Depends on the material and the use of requirements. Ordinary gray iron, if the incision is not strict, such as water pipes. They are all sheared with hydraulic cutting machine, but the incision will not be very smooth. If it is ductile iron, and the incision requirements are high, it can only be used plasma cutting machine. General fittings, if not specifically required, shall not be cut by machining methods.
Q:What is the relationship between the direction of the spigot and the direction of the flow in the ductile iron pipe?
Use more than 18 casting molten iron, by adding the spheroidizing agent, through the centrifugal ductile iron machine high-speed centrifugal casting pipe
Q:What effect does magnesium play in nodular cast iron?
The role of magnesium as spheroidizing agent used in iron spheroidizing treatment, promote water ink is made of iron, carbon in liquid iron spherical graphite precipitation.
Q:What are the differences between cast iron pipes W and A?
Cast iron drainage pipe generally divided into three categories, namely W type socket cast iron pipes, cast iron pipes of A type, B type cast iron drainage pipe, the three pipes have good seismic performance, strong sealing performance, simple construction, convenient maintenance, reliable use, so it is also called the cast iron pipe for earthquake.
Q:What's the difference between ductile iron pipe and cast iron pipe?
Ductile iron pipe is based on cast iron, changed some of the characteristics of the structure of iron, so that it has become a lot of toughness, than the cast iron pipe is too brittle shortcomings much better, the tensile strength of the pipe bending strength greatly improved. The sealing material used in the socket interface is rubber ring.
Q:Can ductile iron pipes be made of flexible waterproof sleeves?
Usually, a bushing is used to make a pool. It is the conduit to the sink. However, the common casing is difficult to seal so that there is water leakage between the casing and the pipe and water leakage between the casing and the wall. Only the waterproof sleeve can solve the water leakage between the casing and the wall, but it can not solve the seal between the casing and the pipe, and the flexible waterproof bushing can solve two problems.
Q:How to properly maintain FRP pipes
Length of single pipe lengthReduce pipe connection, speed up installation, improve the quality of the whole pipeline.
Q:Does the cast iron have size 250? What's the performance?
You should be the casting grade or material, if it is ductile iron, said generally between QT400-15 or QT700-2 different indicators, said in front of the tensile strength, the elongation rate refers to the back, China is now the lowest grade of nodular cast iron material is QT400-15, such as QT250.In addition, the number 250 you refer to may also be a code name for ductile iron parts, such as 200, 300, etc., which are manufactured by the factory as required by the project.Gray iron, which has a 250 brand, is generally referred to as HT250, but it is not ductile iron.The machine on the ductile iron and gray iron are used, but generally not made of grey cast iron gear
Q:What are the requirements for the hydrostatic test of ductile iron pipes?
The pipe work pressure P is less than 0.5MPa, the test pressure is 2P, the pipe work pressure is greater than 0.5MPa, the test pressure is P+0.5. After the water pressure rises to the test pressure, the pressure is fixed for 10 minutes, and the pipe joint and the pipe body are not damaged and leaked.

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