Ductile iron pipes, also known as nodular cast iron pipes, have emerged as a leading choice in the field of pipeline systems, especially in applications where durability, strength, and corrosion resistance are of utmost importance. Among them, the K9 grade ductile iron pipes conforming to the GB/T 13295 standard, with a diameter of 800mm, represent a high - quality and reliable solution.
1. Manufacturing Process
The production of ductile iron pipes begins with carefully selected raw materials. High - quality pig iron, scrap iron, and various alloying elements are melted in a furnace, typically an electric arc furnace or a cupola furnace. The molten iron is then treated with a nodulizing agent, such as magnesium - based alloys. This treatment transforms the graphite in the iron from a flake - like structure, as in gray cast iron, into small, spherical nodules. The spherical graphite nodules significantly improve the mechanical properties of the iron, enhancing its ductility and toughness.
After nodulization, the molten iron is poured into centrifugal casting machines. In the centrifugal casting process, a rotating mold is filled with the molten metal. The centrifugal force forces the molten iron against the inner surface of the mold, resulting in a uniform wall thickness and a dense microstructure. This manufacturing method ensures that the pipes have consistent quality and dimensional accuracy.
2. Grade K9
The K9 grade is a widely recognized standard in the ductile iron pipe industry, which indicates a high - level of quality and performance. The "K" in K9 stands for "kvalitet" (quality in Danish), and the number 9 represents a specific set of mechanical and physical properties.
For K9 grade ductile iron pipes with a diameter of 800mm, they are required to have a minimum tensile strength of 420 N/mm². This high tensile strength allows the pipes to withstand significant internal and external pressures without rupturing. In addition, the minimum yield strength should be 300 N/mm², ensuring that the pipes can maintain their shape and structural integrity under normal operating conditions. The elongation percentage of K9 grade pipes is at least 10%, which is a crucial factor in their ability to absorb shock and resist cracking caused by ground movement or temperature changes.
3. Standard GB/T 13295
The GB/T 13295 standard is a national standard in China that specifically pertains to water - supply ductile iron pipes, fittings, accessories, and their hydraulic performance requirements. This standard covers a wide range of aspects related to ductile iron pipes, ensuring their safe and efficient use in water supply systems.
According to GB/T 13295, the chemical composition of the ductile iron used in the pipes is strictly regulated. Elements such as carbon, silicon, manganese, phosphorus, and sulfur must be within specific ranges to guarantee the desired mechanical properties. For example, carbon content is usually around 3.5 - 4.0%, which helps in promoting the formation of graphite nodules. Silicon content is typically in the range of 2.2 - 2.8%, which influences the nodularity and mechanical properties of the iron.
The standard also sets requirements for the internal and external coatings of the pipes. The internal surface of the pipes is usually coated with a layer of cement mortar lining. This lining not only protects the inner wall of the pipe from corrosion but also helps to maintain the quality of the water flowing through the pipe. The thickness of the cement mortar lining for an 800mm diameter K9 pipe is specified in the standard to ensure its effectiveness. On the external surface, a zinc - based coating is commonly applied, followed by a bituminous or polymeric top - coat. This double - layer coating system provides excellent corrosion protection, extending the service life of the pipes even in harsh environments.
In terms of hydraulic performance, GB/T 13295 specifies the allowable head loss and flow capacity of the pipes. For an 800mm diameter ductile iron pipe, the smooth inner surface provided by the manufacturing process and the lining helps to reduce frictional resistance, allowing for efficient water flow. The standard also requires that the pipes be able to withstand hydrostatic pressure tests at specified values to ensure their integrity and leak - tightness.
4. Diameter of 800mm
A diameter of 800mm makes these ductile iron pipes suitable for a variety of large - scale applications. In urban water supply systems, such pipes are often used for main transmission lines, where large volumes of water need to be transported over long distances. Their large diameter allows for high - flow rates, ensuring an adequate supply of water to meet the demands of a growing population.
In industrial settings, 800mm diameter ductile iron pipes can be used in the transportation of cooling water, process water, or other fluids. For example, in power plants, these pipes may be employed to carry large amounts of cooling water to and from the condensers. The pipes' ability to withstand high pressures and resist corrosion makes them ideal for such industrial applications.
In addition, in some large - scale irrigation projects, 800mm diameter ductile iron pipes can be used to distribute water over vast agricultural areas. Their durability and reliable performance ensure a consistent water supply for crop irrigation, contributing to increased agricultural productivity.
5. Performance and Advantages
One of the key advantages of K9 grade ductile iron pipes with a diameter of 800mm conforming to GB/T 13295 is their excellent corrosion resistance. The combination of the nodular graphite structure, the internal cement mortar lining, and the external zinc - based coating provides a multi - layer defense against corrosion. This corrosion resistance significantly extends the service life of the pipes, reducing the need for frequent replacements and maintenance.
These pipes also offer high strength and pressure resistance. Their ability to withstand high internal pressures makes them suitable for use in water supply systems with elevated water pressures, such as those in high - rise buildings or water treatment plants. Moreover, they can endure external loads, such as those from soil compaction or traffic loads, without deformation or failure.
Another advantage is their good hydraulic performance. The smooth inner surface of the pipes reduces frictional losses, allowing for efficient water flow. This not only helps to save energy in pumping systems but also ensures a stable and reliable water supply.
In terms of installation, ductile iron pipes are relatively easy to install compared to some other types of pipes. They are available in various lengths, and the joints are designed to be easily assembled. For 800mm diameter pipes, the joints are often designed to be flexible, which can accommodate small amounts of ground movement without causing leaks.
In conclusion, K9 grade ductile iron pipes with a diameter of 800mm conforming to the GB/T 13295 standard offer a combination of high strength, corrosion resistance, good hydraulic performance, and ease of installation. They are a reliable choice for a wide range of applications in water supply, industrial, and agricultural sectors, playing a crucial role in ensuring the efficient and sustainable operation of pipeline systems.
| High-quality Ductile iron Pipe Parameters. |
| Specification |
K7 Wall Thickness/mm |
K8 Wall Thickness/mm |
K9 Wall Thickness/mm |
Theoretical Weight/Ton |
| Nominal Wall Thickness |
Minimum Wall Thickness |
Nominal Wall Thickness |
Minimum Wall Thickness |
Nominal Wall Thickness |
Minimum Wall Thickness |
| DN80 |
/ |
/ |
/ |
/ |
6 |
4.7 |
0.077 |
| DN100 |
4.2 |
2.9 |
4.8 |
3.5 |
6 |
4.7 |
0.095 |
| DN150 |
4.55 |
3.25 |
5.2 |
3.9 |
6 |
4.7 |
0.144 |
| DN200 |
4.9 |
3.6 |
6.5 |
4.3 |
6.3 |
4.8 |
0.194 |
| DN250 |
5.25 |
3.95 |
6 |
4.7 |
6.8 |
5.25 |
0.255 |
| DN300 |
5.6 |
4.3 |
6.4 |
4.8 |
7.2 |
5.6 |
0.323 |
| DN350 |
5.95 |
4.65 |
6.8 |
5.15 |
7.7 |
6.05 |
0.403 |
| DN400 |
6.3 |
4.6 |
7.2 |
5.5 |
8.1 |
6.4 |
0.482 |
| DN450 |
6.65 |
4.9 |
7.6 |
5.85 |
8.6 |
6.85 |
0.577 |
| DN500 |
7 |
5.2 |
8 |
6.2 |
9 |
7.2 |
0.669 |
| DN600 |
7.7 |
5.8 |
8.8 |
6.9 |
9.9 |
8 |
0.882 |
| DN700 |
8.4 |
6.4 |
9.4 |
7.6 |
10.8 |
8.8 |
1.123 |
| DN800 |
9.1 |
7 |
10.4 |
8.3 |
11.7 |
9.6 |
1.394 |
| DN900 |
/ |
/ |
11.2 |
9 |
12.6 |
10.4 |
1.691 |
| DN1000 |
/ |
/ |
12 |
9.7 |
13.5 |
11.2 |
2.017 |
| DN1200 |
/ |
/ |
13.6 |
11.1 |
15.3 |
12.8 |
2.758 |
| DN1400 |
/ |
/ |
15.2 |
12.5 |
17.1 |
14.4 |
3.669 |
| DN1500 |
/ |
/ |
16 |
13.2 |
18 |
15.2 |
4.175 |
| DN1600 |
/ |
/ |
16.8 |
13.9 |
18.9 |
16 |
4.668 |
| DN1800 |
/ |
/ |
18.4 |
15.3 |
20.7 |
17.6 |
5.803 |
| DN2000 |
/ |
/ |
20 |
16.7 |
22.5 |
19.2 |
7.043 |
| DN2200 |
/ |
/ |
21.6 |
18.1 |
24.3 |
20.8 |
8.332 |
| DN2400 |
/ |
/ |
23.2 |
20.3 |
26.1 |
22.4 |
9.822 |
| DN2600 |
/ |
/ |
24.8 |
20.9 |
27.9 |
24 |
11.392 |
| K7, K8, and K9 are all calculated based on the same theoretical weight. |
| Pressure - Bearing Performance Parameters of Ductile Iron Pipes |
| DN |
DE(mm) |
Pressure Rating |
Radial Rigidity
(KN/M²) |
Nominal Wall Thickness
(mm) |
PFA
MPA |
PAM
MPA |
PEA
MPA |
| DN80 |
98 |
C40 |
856 |
4.4 |
4.0 |
4.8 |
5.3 |
| DN100 |
118 |
C40 |
481 |
4.4 |
4.0 |
4.8 |
5.3 |
| DN125 |
144 |
C40 |
271 |
4.5 |
4.0 |
4.8 |
5.3 |
| DN150 |
170 |
C40 |
163 |
4.5 |
4.0 |
4.8 |
5.3 |
| DN200 |
222 |
C40 |
84 |
4.7 |
4.0 |
4.8 |
5.3 |
| DN250 |
176 |
C30 |
52 |
4.9b |
3.0 |
3.6 |
4.1 |
| DN300 |
326 |
C30 |
34 |
5.1 |
3.0 |
3.6 |
4.1 |
| DN350 |
378 |
C30 |
44 |
6.3b |
3.0 |
3.6 |
4.1 |
| DN400 |
429 |
C25 |
34 |
6.5b |
3.0 |
3.6 |
4.1 |
| DN450 |
480 |
C25 |
23 |
6.5b |
2.5 |
3.0 |
3.5 |
| DN500 |
532 |
C25 |
17 |
6.5 |
2.5 |
3.0 |
3.5 |
| DN600 |
635 |
C25 |
17 |
7.6b |
2.5 |
3.0 |
3.5 |
| DN700 |
738 |
C25 |
17 |
8.8b |
2.5 |
3.0 |
3.5 |
| DN800 |
842 |
C25 |
15 |
9.6 |
2.5 |
3.0 |
3.5 |
| DN900 |
945 |
C25 |
15 |
10.6 |
2.5 |
3.0 |
3.5 |
| DN1000 |
1048 |
C25 |
14 |
11.6 |
2.5 |
3.0 |
3.5 |
| DN1100 |
1152 |
C25 |
14 |
12.6 |
2.5 |
3.0 |
3.5 |
| DN1200 |
1255 |
C25 |
14 |
13.6 |
2.5 |
3.0 |
3.5 |
| DN1400 |
1462 |
C25 |
14 |
15.7 |
2.5 |
3.0 |
3.5 |
| DN1500 |
1565 |
C25 |
14 |
16.7 |
2.5 |
3.0 |
3.5 |
| DN1600 |
1668 |
C25 |
13 |
17.7 |
2.5 |
3.0 |
3.5 |
| DN1800 |
1785 |
C25 |
13 |
19.7 |
2.5 |
3.0 |
3.5 |
| DN2000 |
2082 |
C25 |
13 |
21.8 |
2.5 |
3.0 |
3.5 |
| DN2200 |
2288 |
C25 |
13 |
23.8 |
2.5 |
3.0 |
3.5 |
| DN2400 |
2495 |
C25 |
13 |
25.8 |
2.5 |
3.0 |
3.5 |
| DN2600 |
2702 |
C25 |
13 |
27.9 |
2.5 |
3.0 |
3.5 |
| DN2800 |
2908 |
C25 |
13 |
29.9 |
2.5 |
3.0 |
3.5 |
| DN3000 |
3115 |
C25 |
13 |
31.9 |
2.5 |
3.0 |
3.5 |
Q1: Are you trading company or manufacturer ?
A1: We are factory.
Q2:Can I go to your factory to visit?
A2:Of course, we welcome customers from all over the world to visit our factory.
Q3: How long is your delivery time?
A3: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to
quantity.
Q4:What is the advantage about your company?
A4:Our company has professional team and professional production line.
Q5: The logo and the color can be customized?
A5: Yes, we welcome you to sample custom
Q6: Any other good service your company can provide?
A6:Yes,we can provide good after-sale and fast delivery.
Q7:What product information do I need to provide?
A7:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.
Q8:Does the product have quality inspection before loading?
A8:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we accept the third party inspection absolutely.
Factory Introduction
We are a specialized ductile iron pipe manufacturing factory based in Shanxi, China. With a rich heritage of over 20 years in this industry, we have established ourselves as a reliable and experienced player in the global market.
Our ductile iron pipes have found their way to numerous countries across the globe. This wide - reaching export network is a testament to the trust that our international customers place in our products. The quality of our pipes has been recognized and praised by various sectors. We adhere to strict international quality standards, and our production facilities are equipped with state - of - the - art technology to ensure precision and consistency.
Each batch of our products undergoes rigorous quality control checks. We conduct comprehensive tests on factors such as pipe strength, pressure - bearing capacity, and corrosion resistance. This meticulous approach to quality control has earned us a reputation for delivering products that are not only durable but also perform optimally in diverse applications, whether it's for water supply, gas transmission, or other infrastructure projects.
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