DUCTILE IRON PIPES K8 DN1400

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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:The role of chromium in nodular cast iron
In the bending fatigue test of crankshaft, it is also found that the chromium containing cast nodular iron crankshaft has the characteristics of large ultimate bending moment, high safety factor, overload duration, high strength and small deformation.
Q:How can the ductile iron pipe depress the elbow so as to prevent it from being opened?
Elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, nonferrous metals and plastics.
Q:What are the advantages and disadvantages of spheroidal graphite cast iron?
Therefore, ductile iron pressure containing parts are treated with a ferritizing annealing cycle, the globular structure of ductile iron internal can also eliminate the crack phenomenon of iron easy to produce graphite flakes within the. In microscopic photographs of ductile iron, cracks can be seen and terminated after the parade of graphite balls. In the ductile iron industry, these graphite balls are called "crack terminator" because they have the ability to prevent fracture.
Q:Will nodular 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:What are the advantages of cast iron pipes?
Ductile iron pipe is under high water pressure, can resist the external load change and adapt to the geological conditions, the pipe has the advantages of high strength, good toughness, corrosion resistance, convenient installation, flexible interface, strong shock resistance, low labor intensity, can be applied to the poor geological location and across the road, without additional processing pipe, and then with strong corrosion resistance, and can be applied to coastal saline alkali area. At present, it is widely used in underground pipeline project. Large pipe installation project can reflect the advantages of convenient installation and low labor intensity.
Q:How can the ductile iron pipe be welded?
If the hole on the ductile iron pipe, you can use special hoop lined flexible rubber ring, rubber ring and pipe wall coating with rubber ring, glue to be fixed.
Q:What kind of valves are commonly used in ductile iron pipes?
Gate valve, butterfly valve, globe valve, check valve flange of various valves, (but the pipeline used for water supply and some limitations of the transport medium may be prescribed valve type) now due to material improvements in the technology, in most cases, smaller pipe diameter is also large diameter pipe outlet valve, butterfly valve, because of the pipeline the large diameter pressure in the pipeline and water than the small caliber to open and close the valve, to human hard, efficiency is not high, so for butterfly valve,
Q:QT400-10 nodular cast iron requires hardness of HRC47~51. Why can't quench hardness be reached?
Because of the high tempering stability of the nodular iron, the tempering temperature is 400-450 degrees, and the tempering time is 1 hours.
Q:Comparison of ductile iron pipe and spiral steel pipe
Can only be used for drainage pipe for comparison, other uses are not mentioned in the same breath.
Q:What is the difference between a PE fire hose and a ductile iron 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.

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