DUCTILE IRON PIPES C Class DN1600

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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:Is the crankshaft material forged or ductile iron?
Nodular cast iron, cast iron, forged steel crankshaft are used in the three. There are 3 kinds of axes in our company
Q:The difference between ductile iron pipe and UPVC drain pipe
Centrifugal ductile iron pipe is ideal for urban water supply, gas pipelines, sets of high strength, good ductility and corrosion resistance advantages, performance with nature, iron and steel, is the replacement of the traditional cast iron pipe and common steel pipe renewal;
Q:Can centrifugal cast iron pipe be galvanized or coated with asphalt which is good for corrosion prevention?
1, outdoor grounding of anti-corrosion, we must consider the contact resistance, so it is recommended not to use asphalt, and do not use anti-corrosion paint, preferably galvanized anti-corrosion.2, asphalt anti-corrosion paint has good water resistance, moisture resistance, corrosion resistance. Acid and alkali resistance, salt fog resistance, atmospheric exposure and so on. The utility model is suitable for coating internal and external surfaces of various containers and machinery, underground steel structures and underground pipelines for moisture proof, water resistance and corrosion prevention. The utility model is also suitable for repairing water cracks in houses.3, anticorrosive paint is used in the surface of the object, can be used to protect the interior of the object without corrosion of a kind of paint. It is one of the more commonly used than paint anti-corrosion paint in industrial construction, widely used in aviation, shipbuilding, chemical, oil pipelines, steel structures, bridges, oil rigs and other fields, by the vast number of manufacturers favor building.
Q:What are the advantages and disadvantages of spheroidal graphite cast iron?
As a substitute for steel, man developed ductile iron in 1949. The carbon content of cast steel is less than 0.3%, while that of cast iron and ductile iron is at least 3%. The low carbon content in cast steels makes the carbon free of graphite free of structural flakes. The natural form of carbon in cast iron is the form of free graphite flakes. In ductile iron, the graphite flakes change into tiny spheres by special treatment. The improved sphere makes ductile iron more superior in physical properties than cast iron or steel. It is the globular microstructure of this kind of carbon that makes ductile iron more ductile and impact resistant, while the thin form of cast iron causes the cast iron to be free of ductility. The best ductility can be obtained by ferrite matrix.
Q:Will nodular 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. Qualified ductile iron pipes can be used for more than a hundred years. The main place where rust is easily exposed is where the outer wall meets the soil because of its high humidity and high oxygen content. Qualified anticorrosion can effectively resist rust, its process principle can not give you the details.
Q:Method for cutting cast iron pipe
Generally cast iron pipe wall thickness, crisp texture, with traditional saw blade, saw blade cutting, very expensive cutting materials, and cutting accuracy is not high. Nowadays, the cutting tools and cutting machines on the market cut off these kinds of pipes, which are fast and cutting tools. Because the length of the pipe is not cut, the pipe can be continuously cut for a while after the equipment is loaded on the equipment. The worker can spare more time and can realize the operation of more than one machine, thus greatly improving the cutting efficiency. Rotary tool pipe cutting machine cutting cast iron pipe sawdust granular, easy chip removal, cutting section of vertical high, smooth surface without burr. The current equipment has been widely used in cast iron pipe cutting, especially iron pipe cutting, even cylinder car production.
Q:How does the white iron appear in the case of ductile iron?
Casting cooling, surface and thin section at often produce white. White tissue hard and brittle, poor processing performance, easy peeling. So it is necessary to use the annealing (or normalizing) method to eliminate white tissue. The annealing process: heating to 2 DEG C 550950 ~ 5 h, then 500 to 550 DEG C Furnace cooling again followed by air cooling. During high temperature insulation, high travel cementite eutectic cementite decomposition of graphite and A in the subsequent two carburizing cooling process and eutectoid cementite decomposition, graphitization process. Due to the decomposition of cementite, resulting in the decrease in hardness, thereby improving machinability.Hope to help you.
Q:How can the ductile iron pipe be welded?
The nickel electrode cold welding, such as Z408
Q:Can ductile iron pipes be installed outdoors?
Graphite is exist in spherical form, usually graphite size is 6-7, casting spheroidization grade control requirements for 1-3 quality (spheroidization rate greater than 80%), so the mechanical properties of the material itself has been improved, has the essence of iron, steel performance. The annealed ductile iron pipe is composed of ferrite and pearlite. The mechanical properties of the ductile iron pipe are better.
Q:Does the cast iron have size 250? What's the performance?
Ductile iron does not have size 250. Ductile iron is the beginning of QT, QT400-15, QT450-10, QT500-7 is the general use of nodular cast iron brand. Nodular cast iron welding can be determined, this should be in some high strength cast iron equipment used more, the tensile strength of normally ductile cast iron welding in welding is higher, is worse than the grey cast iron, it is actually very difficult to distinguish with the naked eye is ductile iron or cast iron the iron in the repair equipment, we usually use WE777 special cast iron electrode universal wide welding, but it is only for maintenance use, the effect is really good, reducing the risk of cracking and high strength welding rod matching to ensure the strength of welding seam.

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