Classification and characteristics of ductile cast iron GuanCheng inserted tee to take over the size of pipe is divided into two kinds, namely A series (
To take over the size and B series (
Take over size or English (
A series of size)
And metric over (
The B series size)
Also, some standards directly to take over the size of A series, these standards are ASME B16.
11, SH3410 standards.
Some standards have two size, production and processing, the need to implement the control of size these standards GB/T14383 -
93 HG21634 etc. , if you use A party fails to provide the choice of nozzle size, usually for A series by default.
Use more than 18 casting
molten iron after adding nodularizer, after centrifugal ductile cast iron machine high-speed centrifugal casting pipes, called 'ductile cast iron pipe' (
, referred to as ball tube, iron and ductile pipe
Is mainly used for conveying water, tap water pipe materials ideal choice.
Ductile 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 material itself machinery ductile iron pipes finished-parts storage can get a good improvement, 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%.
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