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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:It's not easy to drill ductile iron with cobalt high speed steel bit. Please help to point it out
The material can be annealed and the process is simple, that is, heating the workpiece and cooling it naturally. In this way, the hardness of the workpiece can be reduced.
Q:Is the fire hose capable of using rapid repair joints?
Installation joint. Insert the socket into the socket to coincide with the central axis of the pipe or pipe to be joined. Use a guide chain to tighten the pipe member until the pipe mouth enters between the two white lines.
Q:How much is a ductile iron pipe dn400?
High quality cast iron ductile iron pipe with low phosphorus and low sulfur iron making production of blast furnace, according to the current international advanced centrifugal casting, annealing process, water-cooled metal type centrifugal pipe casting machine casting, after annealing, socket dressing, pressure test, internal lining layer of cement, cement treated lining, water and health cement lining, outer wall coated with asphalt paint, asphalt paint baking, socket antirust processing, spray marks and other procedures for the packaging, with high strength, high elongation, corrosion resistance of a body strong as iron.
Q:What is ductile iron pipe?
Ductile iron pipe is a kind of cast iron pipe. In quality, the spheroidization of cast iron pipes is controlled to be 1-3 (spheroidization rate 80%), so the mechanical properties of the material have been better improved, with the nature of iron and the properties of steel. Ductile cast iron pipe after annealing, the microstructure is ferrite and pearlite, good mechanical properties, excellent corrosion resistance, good ductility, good sealing effect, simple installation, mainly for municipal, industrial and mining enterprises, water supply, gas, oil etc..
Q:How can the ductile iron pipe be tested?
Pipe in water pressure test, step by step step by step step up, and each time the boost value is 0.2 MPa, in each time after the boost, the heart must be determined after the voltage regulator can continue to step up
Q:What is cast iron pipe?
Cast iron pipes (Cast, Iron, Pipe), cast cast pipe. Cast iron pipes are used for water supply, drainage and gas transmission lines. They include cast iron pipes and pipe fittings. Labor intensity is small. According to the casting method, it is divided into continuous cast iron pipe and centrifugal cast iron pipe, in which the centrifugal cast iron pipe is divided into sand mould and metal type two kinds.
Q:How can the internal and external walls of ductile iron pipes be protected from corrosion?
Internal walls can be painted anti-corrosion paint, exterior anti-corrosion can choose to paint, but also useful anti-corrosion tape, or do 3PE anti-corrosion, look at your anti-corrosion requirements, cost budget and other construction objective conditions.
Q:Classification of cast iron pipes
Continuous cast iron straight pipe:Continuous cast iron pipe, namely continuous casting gray cast iron pipe, suitable for water and gas pressure fluid delivery.
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 is the use of ductile iron?
Ductile iron is used as a conduit at the beginning. Iron pipes and fittings are mostly produced by major industrial countries. Their manufacture, design and use are in line with national standards and international standards and procedures (I502531). As far as water and other liquids are concerned, it has long been proved that ductile iron pipes are superior to gray iron pipes. The main reason for this change is the combination of strength and toughness of Ferritic Ductile Iron, which makes the pipes made of this material subject to high operating pressures and can be readily loaded and laid during laying. A gas pipeline must be able to withstand multiple use requirements, which stand near the pipeline excavation and municipal engineering construction and transportation, where the ball iron pipes with high strength, high performance and simple installation and connection technology has proved that this material selection is decisive.

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