K9 Black Ductile Iron Pipe

K9 Black Ductile Iron Pipe is a high-strength, corrosion-resistant pipeline product widely used in water supply and municipal engineering. Manufactured to strict international standards, the K9 grade ensures excellent mechanical properties, high pressure bearing capacity, and reliable toughness, effectively preventing cracks and breakages during installation and operation. With a black anti-corrosion surface treatment, it offers long service life and strong adaptability to various underground environments. Featuring good sealing performance and easy connection, it is widely applied in drinking water transmission, drainage networks, and urban infrastructure construction, providing safe and stable fluid transportation for long-term engineering use.

Key Attributes

Product NameK9 Black Ductile Iron Pipe
The standard of pipeISO 2531, EN545, EN598
Pipe classK9, C40, C30, C25, etc
Pipe jointPush-on joint(Tyton joint), K type joint, self-restrained joint
Effective lengthIn general, the pipe length is 6m for bulk shipment and 5.7m for container shipment
Internal liningCement mortar lining as per ISO4179
Zinc coatingAt least 130g/m2 as per ISO 8179
Bitumen paintingAt least 70um as per ISO 8179
GasketsNBR rubber, natural rubber, SBR rubber or EPDM rubber ring as per ISO4633
DN80 - 2600mm
AdvantageHigh strength, lighter than gray iron, good corrosion resistance, no furring, small flow   resistance, easy fixing, long life time
Chemical composition: (%)a) C: 3.5 - 4.0   b) Si: 1.9 - 2.6  c) Mn:0.15 - 0.45  d) P: <0.06  e) S: <0.02
Mechanical propertiesa) Tensile strength: ≥420MPa   b) Yield strength: ≥300Mpa   c) Hardness: ≤230HB   d) Elongation%: DN80 - 1000 ≥10 DN1200 - 2200 ≥ 7
PackingBundled with steel belts or in bulk
ShipmentIn bulk or container

Product Details

Ductile iron pipe is a high-quality pipe material, mainly made of ductile iron. The essence of cast iron pipe is ductile iron pipe, because ductile iron pipe has the essence of iron and the performance of steel. Graphite in nodular cast iron pipes exists in a spherical form, and the size of the general graphite is 6-7. In terms of quality, the nodularization grade of cast iron pipe is required to be controlled to 1-3 grades, and the nodularization rate is ≥80%, so the mechanical properties of the material itself have been better improved, with the essence of iron and the performance of steel. The ductile iron pipe after annealing has good mechanical properties, so it is also called cast iron pipe.



Product line


The ductile iron used to manufacture the pipe is characterized by the spheroidal or nodular nature of the graphite within the iron. Typically, the pipe is manufactured using centrifugal casting in metal or resin lined moulds. Protective internal linings and external coatings are often applied to ductile iron pipes to inhibit corrosion: the standard internal lining is cement mortar and standard external coatings include bonded zinc, asphalt or water-based paint. In highly corrosive environments loose polyethylene sleeving (LPS) to encase the pipe may also be used.




Product testing


In order to ensure product quality, we will arrange professional personnel to check product quality, packaging, weight, hardness, etc., according to customer requirements of product specifications, looking for high-quality and cheap cooperative factories in China, to provide customers with one-stop procurement services and quality assurance.



Product packaging


Excellent packaging: waterproof paper and plastic film + iron cover + at least three strapping straps + strapping straps fixed on iron or wood pallets can effectively protect products from corrosion and various climate changes during transportation. Generally speaking, we ship from Shanghai, Tianjin, Qingdao and Ningbo ports. We have worked with many experienced shipping companies for a long time to find the most suitable mode of transportation for you.


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