Duplex Steel Pipe

What is a duplex steel pipe, and what are its key characteristics?
Duplex steel pipe is a type of pipe that is constructed using duplex stainless steel, a material known for its exceptional strength and corrosion resistance properties. Duplex stainless steel combines austenitic and ferritic stainless steel, offering a unique microstructure that contributes to its advantageous characteristics. The key features of duplex steel pipe include high tensile strength, excellent resistance to various forms of corrosion such as pitting and crevice corrosion, good weldability, and exceptional durability.

These pipes can withstand harsh environments, making them suitable for applications in oil and gas, chemical processing, desalination, and offshore systems. Additionally, duplex steel pipes offer enhanced resistance to stress corrosion cracking, making them ideal for demanding and corrosive environments. Duplex steel pipes provide a reliable and efficient solution for industries requiring strength, corrosion resistance, and longevity in their piping systems.

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What are the advantages of using duplex steel pipes compared to other types of pipes?
Duplex steel pipes offer several advantages over others, making them a preferred choice in various industries. Their excellent corrosion resistance properties allow them to withstand harsh environments and aggressive substances, such as corrosive chemicals, seawater, and acidic solutions. This corrosion resistance helps prolong the pipes' lifespan, reducing maintenance costs and minimizing the risk of leaks or failures.

Duplex steel pipes exhibit high strength due to their unique microstructure combining austenitic and ferritic phases. This strength enables them to withstand high pressures and temperature variations, making them suitable for applications that require reliable performance under demanding conditions.

Another advantage is the good weldability of duplex steel pipes. They can be easily joined using common welding techniques, ensuring efficient and cost-effective installation processes. Additionally, their weldability allows for modifications or repairs to be made on-site, minimizing downtime during maintenance activities.

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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 pipes thus manufactured are cut to the required lengths depending upon the industrial demand. These Duplex stainless 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 Duplex Steel 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 dss 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.

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