ASTM A691 Pipe

What is ASTM A691 pipe, and what are its key features?
ASTM A691 pipe is a specification established by the American Society for Testing and Materials (ASTM) that outlines the requirements for electric-fusion-welded (EFW) carbon and alloy steel pipe suitable for high-temperature service. This type of pipe is commonly used in industries such as oil and gas, power generation, and petrochemicals.

The key features of ASTM A691 pipe include its ability to withstand high temperatures and pressures, making it ideal for applications where the transportation of fluids or gases at elevated temperatures is required. It is designed to have excellent strength and durability, ensuring reliable performance even in demanding environments. ASTM A691 pipe offers good corrosion resistance, which is crucial for applications involving exposure to harsh chemicals or corrosive substances.

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ASTM A691 pipe is available in various grades, allowing users to choose the most suitable option based on specific project requirements. These grades can differ in alloying elements, mechanical properties, and heat treatment, enabling customization to meet the needs of different industries and applications.

ASTM A691 pipe provides a reliable and robust solution for high-temperature service, combining strength, durability, and corrosion resistance to ensure efficient and safe fluid transportation in industrial settings.

How does ASTM A691 pipe compare to other types in strength and durability?
Regarding strength and durability, ASTM A691 pipe stands out as a reliable option compared to other types of pipes. Its electric-fusion-welded (EFW) construction offers excellent structural integrity and the ability to withstand high pressure and temperature levels. That makes it particularly suitable for applications in industries such as oil and gas, power generation, and petrochemicals, where the transportation of fluids or gases at elevated temperatures is required.

Compared to traditional seamless pipes, ASTM A691 pipe provides comparable strength and performance while offering potential cost savings. Its welded construction allows for efficient production and larger diameters, making it suitable for projects that require a high flow rate or large-volume transportation.

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Rolling and welding

Firstly, the Alloy Steel strips are made to gone through various quality checks and are trimmed at edges. They are then fed to the tubes mill by Alloy 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 Alloy Steel pipes thus manufactured are cut to the required lengths depending upon the industrial demand. These Alloy Steel 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 Alloy 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 Alloy 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 Alloy Steel pipe exporters. The Alloy Steel 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 Alloy Steel pipe applications, these pipes and tubes are used thereafter for.

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