Ductile iron pipes are how to select the many areas in our country, ductile iron pipes in the medium and small diameter to pipe and pipe connection between the bearing type or flange disk interface methods;
iron, the allowable limit of corner must have superior shock resistance and sealing.
The main composition of nodular cast iron pipe with carbon, silicon, manganese, sulfur, phosphorus and magnesium.
Ductile iron pipes and define more than 18 casting
molten iron after adding nodularizer, after centrifugal ductile cast iron machine high-speed centrifugal casting pipes, ductile iron pipes, referred to as ball tube, iron and ductile pipes, etc.
Use more than 18 casting molten iron after adding nodularizer, after centrifugal ductile cast iron machine high-speed centrifugal casting pipes, called 'ductile iron pipes, referred to as ball tube, iron and ductile pipes, etc.
Is mainly used for conveying water, tap water pipe materials ideal choice.
Features: nodular cast iron pipe is a kind of cast iron pipe.
Quality requirements of spheroidal graphite cast iron pipe grade control for 1 -
Level 3 (
Spheroidization rate> 80%)
, and got better improvement on the mechanical properties of the material itself, has the nature of the iron and steel performance.
After annealing of nodular cast iron
pipe, the microstructure of ferrite and a small amount of pearlite, good mechanical properties, anti-corrosion performance and ductility can good, good sealing effect, easy to install, it is mainly used for municipal, industrial and mining enterprises, water supply, gas, oil, etc.
In ferrite and pearlite matrix distribution has a certain number of nodular graphite, according to the requirement of the nominal diameter and elongation of different, the proportion of ferrite and pearlite in the matrix organization is different, small diameter of pearlite proportion is generally not more than 20%, the general control of large diameter is about 25%.
Choose proposal 1 to the ductile iron pipes should be selected according to the installation, choose the interface form of straight pipe and fittings.
2 recommended use epdm rubber circle and so on.
3 the choice of coating: according to the use of internal and external conditions to choose suitable and coating.
Existing internal coating of epoxy resin, polyurethane coating inside and outside, PE film coating ductile iron pipes such as new products, when choose, should understand its performance in detail.
Advantages in the low pressure pipe, ductile iron pipe is safe and reliable operation, low breakage rate, convenient construction and maintenance, quick, anti-corrosion performance, etc.
Faults in the high pressure pipe network, generally don't use, low pressure.
Due to the pipe body is relatively heavy, must use mechanical during installation.
On leakage appears after the test, must to dig out all the pipe, the pipeline lift to the height of the can into the clamp, clamp on the installation to prevent leakage.
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The major classifications of are cast iron company, cast iron company, cast iron company and cast iron company machines.