DUCTILE IRON PIPE C Class DN250

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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 excavation width of ductile iron pipes with diameters greater than 1400?
When the condition does not allow enough slope, it is necessary to do wall protection and other means to ensure safetyRemind me, such a big pipe, dig deep in two ways. One is the depth diameter (range at the junction of 1.6 m in length and 500 for manholes and operation. The lower bolt assembly when) there is a depth diameter plus 500. and then in the trench laying branch the pier, installed after the fine stone tamped backfill.Can also be buried directly with the pipe diameter, and then put into the assembly. This method requires a large space on the ground, otherwise, the volume is too large after assembly, weight is too heavy, may cause damage to the pipeline and personnel injuries
Q:Can ductile iron pipes be made of flexible waterproof sleeves?
Flexible waterproof casing is suitable for pipeline through the wall in vibration or by strict waterproof requirements of the structures of hardware fittings, general production enterprises according to the Construction Science Research Institute developed S312, 02S404 standard atlas manufacturing. The wall of flexible waterproof casing wall, in case of non concrete should be replaced by concrete walls, and a casing must be solidified on the wall; flexible waterproof casing application widely used in construction, chemical industry, iron and steel, tap water, sewage treatment and other units.
Q:Water supply pipe is ductile iron, then it's fittings and valves and other parts must be ductile iron?
Ductile iron pipe end rubber ring interface should belong to flexible connection. It should be the way to connect the clamps. Then, the valve is also connected to the card sleeve connection.
Q:Advantages and disadvantages of ductile iron pipes
Comparison between ductile iron pipe and universal cast iron pipe: the process of making ductile iron pipe is cast by adding alkaline earth metal or rare metal such as magnesium and calcium in the raw material of common cast iron pipe. The casting process of nodular cast iron pipe casting method and water cooled centrifugal casting hot continuous casting method, which method is water, the world's most advanced technology, different technology of ductile cast iron and cast iron pipe technology performance comparison, not only to maintain the ordinary cast iron pipe corrosion resistance, and has the advantages of high strength and toughness good, thin wall, light weight, impact resistance, bending performance, convenient installation.
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:What new technologies are there for the installation of ductile iron pipes?
Type W: type W tube in the same pipe with high strength, low noise, good fireproof performance, long service life, with the characteristics of flexibility and good seismic performance, but also has synchronous construction, utilization rate is high, easy to pipe, reducing the hydraulic test of pipeline clearing times, shorten the construction period to improve economic benefits. In addition, this type of interface with bolts in the lateral fastening, avoids the defects of socket flexible interface flange is easy to damage, close to the wall to the fixed bolt, has the advantages of simple operation, so in the selection of building drainage pipes and fittings, with strong competitiveness. In addition, because the length of W pipe is 3M, the number of intermediate joints is greatly reduced, and any length can be intercepted in accordance with the requirements, thereby greatly saving the pipe material, reducing consumption and cost. W type socket with stainless steel hoop rib clamp, lined with rubber ring flexible connection, seismic performance and good sealing performance, no leakage and allowed to swing in a certain range. Therefore, W tubes are widely used both at home and abroad.
Q:Is the fire hose capable of using rapid repair joints?
Clear。 Before installation, cleaning work should be carried out, the parts to be cleaned include: socket end, the mouth of the socket, the corner of the socket to the white line should be smooth, no sharp points, so as not to wear aprons when installation.
Q:What is the relationship between the installation direction of the ductile iron pipe and the direction of flow?
Suppose the water flows from east to west, then the pipe mouth is in the East socket at the West
Q:How many meters does the cast iron water supply pipe dn150,1 tons?
When pouring added calcium alloy in the flow inlet for graft inoculation, every time after the pouring, need in the mold surface with compressed air spraying a thin layer of dry calcium silicate powder, a centrifuge is composed of upper and lower halves of the closed shell, the supporting cast roller is installed on the bottom of the shell, the mold in front of a ring gear mounted on the housing at the end of the DC motor through the transmission gear direct mold, shell mold through Hugh ends are equipped with sealing ring, the front end of the shell shell installed with half ring a turning cylinder pictophonetic mountain Rae centrifuge under the wheels, so as to make reciprocating motion on the inclined orbit
Q:An urban infrastructure construction, water supply pipe is ductile iron pipe and PE pipe, thank you
Because the construction of municipal water supply pressure will be relatively large, generally used in the selection of pipe centrifugal ductile iron pipe, he has properties of iron essence and steel, excellent corrosion resistance, good ductility, good sealing effect, simple installation, ductile iron pipe is mainly used for municipal, industrial and mining enterprises, water supply, gas, oil etc.

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