Ductile Iron Pipes as per IS 8329; ISO 2531: ISO 7186 ; BS EN 545 ; BS EN 598

Ductile Iron Spun Pipes | Ductile Iron Flanged Pipe | Ductile Iron Double Flanged pipe

Importer, Stockholder, Suppliers and Exporters of Ductile Iron Pipes

Ductile Iron Pipes (Cast Iron Pipes)
Ductile Iron (also known as Spheroidal graphite iron or Nodular Cast Iron) was invented in 1949. Ductile Iron retains the corrosion resistance of cast iron but has more than double the tensile strength [Cast Iron- 180 MPa (min), Ductile Iron – 420 MPa (min)]. The essential differences between Ductile and Cast Iron lies in the shape of the graphite in the microstructure of the metal. In Cast Iron, the graphite is present in plate-like flakes, which makes Cast Iron brittle. But in Ductile iron, the shape of the graphite becomes a spheroidal nodule, which offers better mechanical properties and makes Ductile Iron sturdy, Structurally stronger and shock-proof.

Ductile Iron pipe is considered as the most preferred pipe material for water supply and pressure sewerage application all over the world. It offers higher Tensile Strength than Mild Steel and retains the inherent corrosion resistance of cast iron. Pipes made from Ductile Cast Iron, provides substantial benefits in terms of pressure bearing ability, impact resistance and capacity to sustain external static/ dynamic loading.

Range of Pipes

Ductile Iron Spun Pipes are produced in both as per Thickness Class (like, K9, K7 etc) and Pressure Class (Like C25, C30, C40 etc). The Standard Products are listed below.

Size – DN 80 mm to DN 1000 mm
Pressure Class – C20, C25, C30, C40, C50, C64, C100.
Thickness Class – K9 and K7
Standard Length – 5m / 6.0 meters

Conforming Specifications:IS 8329; ISO 2531: ISO 7186; BS EN 545; BS EN 598

Types-

A. Ductile Iron Socket and Spigot Pipe with Push-On Joint from DN 80 to DN 1000 with Rubber Gasket conforming to IS 8329/ ISO 2531/ EN 545/ EN598 for Drinking Water and sewerage. Ductile Iron pipes are available in the following Joints 
Push-on
Push On (Restrained)

B. Ductile Iron Flanged Pipe from DN 80 to DN 1000 conforming to IS 8329/ ISO 2531 / EN 545. Flanged Pipes are available
As cast (Small Barrel lengths)
Welded on
Screwed on

Properties of Ductile Iron Pipe

Inside Lining 
Ductile Iron Pipes installed in water systems today are normally provided with cement mortar lining. Use of cement lining of the pipe avoids tuberculation by creating a high pH at the pipe wall, and ultimately by providing a physical barrier to the flow water to contact with the pipe wall. Further, linings are also smooth, which results in high coefficients with Haizen Willams C as 140 (Colebrook coefficient k = 0.1). In case of sewerage application, suitable lining will provide corrosive resistance to septic transformation (cycle of sulphates, sulphuric acid) to avoid severe carrion to pipe wall. The advantages of internal cement mortar lining are:

• Internal protection of pipe wall against fluid aggressiveness
• Improvement and performance of pipe flow characteristics
• For potable water pipelines, assurance of keeping water quality within
  specified limits.
• Withstand against corrosion due to septic transformations.

Outside Coating
 Intrinsic corrosion resistance of Ductile Iron in various corrosive soils is as least as good as and even somewhat better than that of Cast Iron, as there is not much variation chemically between the two materials. When subjected to corrosion, the nodular graphite of ductile iron pipes forms corrosion by products that adhere firmly to the unattached metal, which provides a barrier against further corrosion. In addition, uniform spreading of spheroidal graphite of ductile iron results in less susceptible to deep localized pitting than that of grey iron pipe, which is important in evaluating its relative resistance to failure by perforation. Due to rubber gasket jointing, ductile pipes are electrically discontinuous. As a result, long line corrosion current, which is dependent on exposure of a single electrical unit to varying soil conditions, cannot develop. Additionally, any accumulation of stray current is limited to short electrical units and usually is of little significance in developing corrosion.

Additional external protection to ductile iron pipe provides long service performance, especially for smaller diameter pipes where wall thickness is comparatively less. Following external protection is normally being provided:-

Note: Preferred ‘C’ class as per ISO2531/2009

Dimensions of Flange

Contact Steber Steel today for a Ductile Iron Pipes Carbon Steel Seamless Pipe competitive quotation…
call : (+91) 22-23824442
e-mail: sales@stebersteel.net

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