Ductile iron pipes refer to pipes that are cast by high-speed
centrifugal casting using a centrifugal ductile iron machine after
adding nodulizing agent to cast molten iron above No. 18. They are
referred to as ductile iron pipes, ductile iron pipes and ductile
cast pipes. It is mainly used for the transportation of tap water
and is an ideal material for tap water pipelines.
Selection suggestions
1. The selection of ductile iron pipes should be based on the
specific conditions of the laying site and the interface form of
straight pipes and accessories.
2. Rubber rings are usually made of NBR, SBR, EPDM and other
materials.
3. Selection of coating: Choose an appropriate coating according to
the internal and external conditions during use. The existing inner
coatings are epoxy resin, polyurethane inner and outer coatings, PE
film coatings and other new ductile iron pipe products. When
selecting, you should understand their performance in detail.
advantage
In medium and low pressure pipe networks (generally used below
6MPa), ductile iron pipes have safe and reliable operation, low
damage rate, convenient and fast construction and maintenance, and
excellent anti-corrosion properties. The newly developed "Rock
Shield" series of pipelines are suitable for trenchless
construction and are widely used in pipeline construction across
rivers, roads, and buildings. "Saizin" series pipelines use a
special zinc-aluminum alloy external spraying process to improve
the corrosion resistance of the pipeline several times and are
widely used in construction in highly corrosive soils.
shortcoming
Generally not used in high-pressure pipe networks (above 6MPa).
Because the pipe body is relatively heavy, machinery must be used
during installation. If water leakage occurs after the pressure
test, all pipes must be dug out, the pipes must be lifted to a
height where the clamps can be placed, and clamps must be installed
to prevent leakage.
Anti-corrosion treatment editor broadcast
1. Asphalt paint coating
Asphalt paint coating is used on pipes carrying gas. Preheating the
pipe before painting can improve the adhesion of the asphalt paint
and speed up drying.
2. Cement mortar lining + special coating
This internal anti-corrosion measure is suitable for pipelines
transporting sewage and can improve the corrosion resistance of the
lining.
3. Epoxy coal pitch coating
Epoxy coal pitch coating is suitable for both gas pipelines and
sewage pipelines. It is a two-component coating that has high
adhesion and a very smooth surface
4. Epoxy ceramic lining
Epoxy ceramic lining is suitable for sewage pipes and gas pipes,
but due to the difficulty and high cost of the manufacturing
process, there are certain limitations in use. Epoxy ceramic lining
has high adhesion and smoothness, and is a good anti-corrosion
coating.
5. Aluminate cement coating or sulfate cement coating
These two special cement coatings are suitable for internal
anti-corrosion of ductile iron pipes used in sewage pipes to
improve their ability to resist the erosion of acid and alkali
components in sewage.
6. Polyurethane coating
It is a new type of green special coating developed to meet the
needs of environmental protection. It has good wear resistance and
corrosion resistance.
Zhengde Ductile iron pipe is a type of cast iron, an alloy of iron,
carbon and silicon. Graphite in ductile iron exists in the form of
spheroids. Generally, the size of graphite is grade 6-7. The
quality requires that the spheroidization level of the cast pipe be
controlled to grade 1-3 (spheroidization rate ≥80%). Therefore, the
mechanical properties of the material itself The performance has
been better improved, with 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 has
good mechanical properties.
Ductile iron pipe is mainly called centrifugal ductile iron pipe.
It has the essence of iron and the performance of steel. It has
excellent anti-corrosion performance, good ductility, good sealing
effect, and is easy to install. It is mainly used for water supply,
gas transmission, and transportation in municipal, industrial and
mining enterprises. Oil etc. It is the first choice for water
supply pipes and has a high cost performance. Compared with PE
pipes, ductile graphite pipes are simpler and faster to install
than PE pipes in terms of installation time, and have better
internal and external pressure resistance after installation; in
terms of airtightness and anti-corrosion, ductile graphite pipes
have better airtightness after installation, and are also The
anti-corrosion performance can be improved through a variety of
anti-corrosion methods; from the perspective of hydraulic
performance, the specifications of ductile graphite pipes generally
refer to the inner diameter, and the specifications of PE pipes
generally refer to the outer diameter, because under the same
specifications, ductile graphite pipes can achieve greater runoff;
from In terms of comprehensive installation and maintenance costs,
ductile graphite pipes have a more superior cost performance. The
inner wall is sprayed with zinc, cement mortar anti-corrosion
materials, etc.
Selection suggestions
1. The selection of ductile iron pipes should be based on the
specific conditions of the laying site and the interface form of
straight pipes and accessories.
2. Rubber rings are usually made of NBR, SBR, EPDM and other
materials.
3. Selection of coating: Choose an appropriate coating according to
the internal and external conditions during use. The existing inner
coatings are epoxy resin, polyurethane inner and outer coatings, PE
film coatings and other new ductile iron pipe products. When
selecting, you should understand their performance in detail.
| DN(mm) | DE(mm) | T(mm) | kg | kg/m |
| K8 | K9 | K10 | K8 | K9 | K10 |
| 80 | 98 | 6 | 6 | 6 | 3.4 | 12.2 | 12.2 | 12.2 |
| 100 | 118 | 6 | 6 | 6.1 | 4.3 | 14.9 | 15.1 | 15.1 |
| 125 | 144 | 6 | 6 | 6.3 | 5.7 | 18.3 | 18.3 | 19 |
| 150 | 170 | 6 | 6 | 6.3 | 7.1 | 21.8 | 22.8 | 22.8 |
| 200 | 222 | 6 | 6.3 | 6.4 | 10.3 | 28.7 | 30.6 | 30.6 |
| 250 | 274 | 6 | 6.8 | 7.5 | 14.2 | 35.6 | 40.2 | 44.3 |
| 300 | 326 | 6.4 | 7.2 | 8 | 18.9 | 45.3 | 50.8 | 56.3 |
| 350 | 378 | 6.8 | 7.7 | 8.5 | 23.7 | 55.9 | 63.2 | 69.6 |
| 400 | 429 | 7.2 | 8.1 | 9 | 29.5 | 67.3 | 75.5 | 83.7 |
| 450 | 480 | 7.6 | 8.6 | 9.5 | 38.3 | 80 | 89 | 99 |
| 500 | 532 | 8 | 9 | 10 | 42.8 | 92.8 | 104.3 | 115.6 |
| 600 | 635 | 8.8 | 9.9 | 11 | 59.3 | 122 | 137.3 | 152 |
| 700 | 738 | 9.6 | 10.8 | 12 | 79.1 | 155 | 173.9 | 193 |
| 800 | 842 | 10.4 | 11.7 | 13 | 102.6 | 192 | 215.2 | 239 |
| 900 | 945 | 11.2 | 12.6 | 14 | 129 | 232 | 260.2 | 289 |
| 1000 | 1048 | 12 | 13.5 | 15 | 161.3 | 275 | 309.3 | 343.2 |
| 1200 | 1265 | 13.6 | 15.3 | 17 | 237.7 | 374 | 420.1 | 466.1 |
| 1400 | 1462 | 16 | 17.1 | 19 | 385.3 | 487 | 547.2 | |
| 1600 | 1668 | 18.4 | 18.9 | 21 | 526 | 614.5 | 690.3 | |
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Company Profile
Shandong Zhengde Metal Manufacturing Co., Ltd. is a production and sales company integrating hot-rolled steel
coils, cold-rolled steel coils, galvanized steel coils,
color-coated steel coils, section steel, steel pipes, steel wires,
metal mesh, stainless steel, aluminum, copper and other metal
products integrated large enterprises. Five production and sales
bases have been formed in Binzhou, Liaocheng, Wuxi, Tianjin, Jinan
and Tai'an, with more than 100 production lines, 4 nationally
recognized laboratories, 2 technical engineering centers, and 5
enterprise technology centers. Products are exported to more than
50 countries and regions such as North America, South America,
Europe, Africa, Oceania, Middle East, and Southeast Asia.
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