Ductile iron pipe refers to the pipe made by high-speed centrifugal casting of centrifugal ductile iron machine after casting molten iron above No. 18 with the addition of nodularizer, referred to as ball pipe, ductile iron pipe and ductile cast pipe. Mainly used for the transportation of tap water, it is an ideal material for tap water pipes.
The essence of cast iron steel pipe is ductile iron pipe. Because ductile iron pipe has the essence of iron and the function of steel, it is called this way. Graphite in ductile iron pipes exists in a spherical shape, and the size of general graphite is 6-7 grades. In terms of quality, it is required that the spheroidization level of cast iron pipes should be controlled at 1-3 levels, and the spheroidization rate should be ≥ 80%. Therefore, the mechanical properties of the material itself have been better improved, and it has the essence of iron and the performance of steel. The metallographic structure of the ductile iron pipe after annealing is ferrite plus a small amount of pearlite, and its mechanical properties are good, so it is also called cast iron pipe.
It has the essence of iron, the performance of steel, excellent anti-corrosion performance, good ductility and easy installation. It is mainly used for water supply and gas transmission in municipal industrial and mining enterprises.
Feature
Ductile iron pipe is a kind of cast iron pipe. In terms of quality, it is required that the spheroidization level of cast iron pipes should be controlled at 1-3 levels (spheroidization rate > 80%), so the mechanical properties of the material itself
The energy has been better improved, with the essence of iron and the function of steel. The annealed ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite. It has excellent mechanical properties, excellent anti-corrosion performance, good ductility, good sealing effect, and easy installation. It is mainly used for water supply and gas transmission in municipal and industrial and mining enterprises. , oil delivery, etc.
There is a certain amount of spherical graphite distributed on the ferrite and pearlite matrix. According to the different nominal diameter and elongation requirements, the proportion of ferrite and pearlite in the matrix structure is different, and the proportion of pearlite with small diameter is different. Generally, it is not more than 20%, and the large diameter is generally controlled at about 25%.
Function
Ductile iron pipe is a type of cast iron, an alloy of iron, carbon and silicon. Graphite in ductile iron exists in spherical form, and the size of general graphite is 6-7 grades. In terms of quality, the spheroidization grade of the cast pipe is required to be controlled at 1-3 grades (spheroidization rate ≥ 80%), so the mechanical properties of the material itself The function has been better improved, with the essence of iron and the function of steel. The annealed ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite, and has better mechanical properties.
Ductile iron pipes are mainly called centrifugal ductile iron pipes, which have the essence of iron and the properties of steel, excellent anti-corrosion performance, good ductility, good sealing effect, easy installation, and are mainly used for water supply, gas transmission, and transportation in municipal and industrial and mining enterprises. oil etc. It is the best choice for water supply pipes, with high cost performance. Compared with PE pipes, in terms of installation time, ductile ink tubes are simpler and faster to install than PE pipes, and the internal and external bearing pressure is better after installation; in terms of airtightness and corrosion resistance, ductile ink tubes are better airtight after installation, and also The anti-corrosion performance can be improved through a variety of anti-corrosion methods; from the perspective of hydraulic performance, because the standard of ductile pipe generally refers to the inner diameter, and the standard of PE pipe generally refers to the outer diameter, because under the same standard conditions, the ductile pipe can achieve greater runoff; from From the perspective of comprehensive installation and maintenance costs, the ductile tube has an increasingly superior cost performance. The inner wall is sprayed with zinc, cement mortar anti-corrosion materials, etc.