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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?
Ductile iron pipe corrosion process is good, decided whether it will rust. Whether it will rust or not, the key is whether the anti-corrosion process of the nodular cast iron pipe is in place.
Q:How much is the installation cost of the ductile iron tube?
Water supply pipe is the first choice, with high cost performance. Compared with the PE pipe, from the installation time, ductile pipe PE pipe installation is simple and rapid, and after the installation of internal and external pressure bearing better tightness and corrosion resistance; from the point of view, ductile pipe sealing better after installation, but also can improve the corrosion resistance through various anti-corrosion methods;
Q:Can the sealing ring of ductile iron pipe be reused?
The sealing ring is hard to install and take off. I have been in this line for six years. I haven't seen it removed. The rubber ring itself is not expensive. It is not necessary to reuse it.
Q:How can 4 inch ductile iron pipe be connected with 2 inch galvanized pipe?
The hot dip galvanized welded steel pipe galvanized pipe, galvanized pipe by welding without taking anti rusting measures (furnace welding and welding) steel pipe, seamless steel pipe or other metal pipe of the clarinet, process of hot dip galvanizing, the outer coating and galvanized layer to long-term corrosion of the steel pipe after processing.
Q:How much water seepage is allowed in the water pressure test for water hose DN300?
Test method: metal composite pipe and water pipe system 10min observed in the test pressure, the pressure drop should be no more than 0.02MPa, and then reduced to working pressure check should be no leakage of plastic pipe; water supply system should be in the test pressure regulator 1H, pressure drop shall not exceed 0.05MPa, then stabilized at 1.15 times the working pressure of the state under 2h, the pressure drop shall not exceed 0.03MPa, and check each connection must not leak.
Q:Does centrifugal cast iron pipe work well with lining cement? Will it scale and breed bacteria?
Poor hydraulic performance and high energy consumption. The roughness coefficient of the prestressed reinforced concrete pipe is between 0.013 - 0.014, so that the pipeline resistance of the pipeline with the same pipe diameter is higher than that of the same water content. Because of its high roughness, after a period of use, the pipeline will be blocked by bacteria, shellfish breeding and reproduction. As the service life increases, the inner diameter of the pipe will gradually shrink and the resistance will increase.
Q:What is the difference between cast iron pipe and seamless steel pipe and galvanized steel pipe?
Seamless steel pipe: a pipe with a hollow cross section, used as a conduit for transporting fluids, such as pipelines for transporting petroleum, natural gas, gas, water, and certain solid materials. Compared withsteel and roundsteelinsolid, flexural torsional strength in the same time, the weight is light, is a kind of economic section steel, widely used in the manufacture of structural parts and mechanical parts, such as the oil pipe, automobile transmission shaft, the bicycle frame and steel construction with scaffold with steel pipe manufacturing ring parts can be improved the utilization rate of materials, simplify the manufacturing process, material saving and working hours, has been widely used to manufacture steel tube.
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: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:Why does the cast iron pipe always run off when testing?
If the pipe is exposed for pressure test, you must add a pier, or else the fittings fly out. You are not surprised. At the same time, the pressure test before the ink tube to make full immersion bubble discharge clean, or a big easy gas pressure pipe explosion.

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