Super Duplex Steel S32750 Seamless Pipe

What is Super Duplex Steel S32750, and why is it commonly used for seamless pipes?

Super Duplex Steel S32750 is a type of stainless steel that is highly corrosion-resistant and possesses exceptional mechanical properties. It is composed of a balanced mixture of austenite and ferrite, which imparts superior strength and toughness to the material. The high chromium and molybdenum content in Super Duplex Steel S32750 provides excellent resistance against pitting, crevice corrosion, and general corrosion, even in harsh environments such as marine and offshore applications.

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Its high tensile strength and low thermal expansion make it suitable for handling high-pressure and high-temperature conditions. These advantageous characteristics, combined with its excellent weldability and formability, make Super Duplex Steel S32750 a popular choice for seamless pipes in various industries, including oil and gas, chemical processing, desalination, and petrochemicals, where reliability, durability, and resistance to corrosion are crucial factors.

How does the manufacturing process of Super Duplex Steel S32750 seamless pipes ensure high quality and reliability?

The manufacturing process of Super Duplex Steel S32750 seamless pipes is designed to ensure high quality and reliability. It begins with carefully selected raw materials, which undergo rigorous quality checks to ensure their conformance to specific standards and specifications. The next step involves hot working the steel, typically through extrusion and piercing processes, to form the initial seamless pipe billet. That is followed by a series of heat treatment processes, including annealing and quenching, which help refine the microstructure of the steel, enhance its mechanical properties, and relieve internal stresses.

Various non-destructive testing techniques are employed throughout the manufacturing process to further enhance the quality and reliability of the seamless pipes. These techniques include ultrasonic testing, magnetic particle inspection, liquid penetrant testing, and visual inspection. These tests detect potential defects or imperfections, such as cracks, inclusions, or surface irregularities, ensuring that only pipes meeting the required quality standards are approved for further processing.

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Rolling and welding

Firstly, the Super 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 Super 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 Super 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 Super 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 Super Duplex Steel pipe applications, these pipes and tubes are used thereafter for.

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