Duplex Steel Seamless Pipe

Duplex Steel Seamless Pipe Manufacturer, Supplier in India

Duplex Steel Seamless Pipe is a type of steel pipe widely used in various industries due to its unique properties and advantages. Duplex steel is a two-phase microstructure consisting of austenite and ferrite, offering a combination of strength, corrosion resistance, and toughness.

One of the main advantages of Duplex Steel Seamless Pipes is their superior corrosion resistance compared to other types of steel pipes. Both austenitic and ferritic phases provide excellent resistance to localized corrosion, such as pitting and crevice corrosion, making them highly suitable for environments with aggressive media, including chloride-rich and acidic environments.

What are the common industries or sectors typically use duplex steel seamless pipes?

Duplex steel seamless pipes find extensive usage across various industries and sectors. Common sectors typically relying on duplex steel seamless pipes include oil and gas, chemical and petrochemical, offshore and marine, pulp and paper, desalination plants, power generation, and pharmaceutical industries. These industries benefit from the exceptional corrosion resistance, high strength, and excellent toughness offered by duplex steel seamless pipes, allowing for reliable and efficient transportation of fluids, handling of aggressive media, and structural integrity in demanding environments.

Duplex steel seamless pipes exhibit higher strength than conventional austenitic stainless steels, allowing for thinner wall thicknesses while maintaining structural integrity. This advantage contributes to cost savings, reduced weight, and improved flow characteristics in various applications.

Another key advantage of duplex steel seamless pipes is their toughness, enabling them to withstand high-stress conditions and resist cracking. This toughness and high corrosion resistance make duplex steel seamless pipes ideal for offshore, oil and gas, chemical processing, and desalination plants.

Duplex steel seamless pipes offer good weldability and formability, allowing easy fabrication and installation. Their versatility and reliability make them suitable for various applications, including piping systems, heat exchangers, pressure vessels, and structural components.

Rolling and welding

Firstly, the duplex steel strips are made to gone through various quality checks and are trimmed at edges. They are then fed to the tubes mill by duplex steel pipe manufacturers in India. The strips pass through the number of rollers as per the required size. In the tubes-mill, the strip is gradually converted into the tubular shape. The fitted welding machine is then used to weld trim edges of the strip using TIG welding process. The scraps and inside weld bead are removed instantaneously by the Tibo machine. In this way, rolled pipes and tubes are formed.

The cleaning and heating phase

The rolled duplex steel seamless pipes thus manufactured are cut to the required lengths depending upon the industrial demand. These duplex pipes and tubes are then subjected to cleaning to remove the dirt. Further, a heat treatment is given to these rolled pipes and tubes to remove the stresses that may occur due to welding and formation processes. Heat treatment is given on the continuously rolling hearth furnace. The furnace is fitted with temperature recorders and controllers. After the heat treatment process, the SS tubes and pipes are straightened and subjected to pickling for removing scales from the surface.

Cold- drawing process

In some cases, the required size may not be obtained from the mill directly. Then, the cold operation process can be used to obtain the desired size. In cold drawing process, the tubes or pipes are coated with oxalic and soap solution. This solution acts as a lubricant to reduce friction while cold drawing operation. In the cold drawing process, the tube or pipe is drawn over the bench using Die plugs.

Finishing process

The drawn-out tube or ss pipe is then subjected to cleaning, heat treatment, pickling and straightening. The computerized ink jet marking machine is used to do the marking on the finished pipes or tubes. The pipe or tube is marked with grade of material, size, heat number and the stamp of third party inspection before passing on to duplex steel pipe exporters. The duplex tubes or pipes thus produced will undergo certain testing and quality checks. This process is followed by proper packing and dispatch. There are numerous numbers of duplex steel pipe applications, these pipes and tubes are used thereafter for.