DUCTILE IRON PIPE K9 DN80

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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 use of ductile iron?
Manufacturer of automotive diesel engines are starting from the prolong engine life, particularly cautious about expressing selection of crankshaft material, when the isothermal bainitic ductile iron and high strength in order to increase the power to weight ratio, expand the turbocharger use influence design according to the material, equipped with exhaust turbocharger tube the temperature is increased to 500 to 70. C, in this condition, the oxidation and creep strength become important. Ductile iron, with good properties, is being used instead of gray iron for the exhaust pipe and will further use silicon aluminum alloy ductile iron as the temperature increases.
Q:How to analyze and judge the quality of ductile iron pipe
The most intuitive judgment ductile pipe quality is the ratio of the thickness of cement and iron, cement thick wall thicker tube quality is better, there are also some manufacturers of the pipe, thick wall pipe head cast iron part looks to be thick, but there is also a thin iron pipe, so the judge quality to open look inside, personally think that the highest price of the manufacturer is Jinan steel, Jinan Iron and steel because the pipe quality can reach the national standard K9, the price is also lower than the emerging, Saint Gobain and other major brands, as the water supply pipe K8 is no problem, but the price and quality aspects for the construction of which more importance.
Q:How many degrees can the ductile iron pipe be each?
Minimum tensile strength: 420/Mpa, minimum yield strength: 300/Mpa, minimum elongation 7%.
Q:What are the meanings of cast iron pipe wall thicknesses LA, A and B respectively?
You are mistaken in concept. The cast iron pipe is the sort of connection method. The ductile iron pipe is classified according to the material.
Q:General cast iron prices now
Hello friends, Tianjin is in Shandong Qingdao 6500 7300 yuan / ton to 7100 yuan a ton of Zhejiang 7500 to 9000 yuan a ton, this is a great relationship, and the production of raw materials, for reference only, we are ductile casting manufacturers, the information can not say 100% accurate but can reference.
Q:Ductile cast iron can replace copper sleeve
The tensile and compressive capacity of the ball milled cast iron is not as good as that of copper. The hardness of Rongchang graphite copper sheath can reach HB210
Q:The difference between spheroidal graphite cast iron pipe and HDPE water supply pipe
HDPE pipe is made of hot melt butt joint, and the strength of interface is very good. Ductile iron pipes are made of socket joint, and reinforced concrete piers shall be rammed on three links, elbows and other parts. In this regard, the cost of natural selection of ductile iron pipe, HDPE pipe than the choice of high.
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:The benefits of ductile iron castings
Its performance is close to carbon steel, but it has good casting performance, easy molding, better machinability than cast steel, better heat resistance, corrosion resistance and wear resistance than steel. And a very important one: cheap.
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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