ASTM A252 Grade 3 Pipe

What are the key specifications and properties of ASTM A252 Grade 3 pipes?

ASTM A252 Grade 3 Pipes are specifically designed and manufactured for structural applications. These pipes are commonly used in deep foundation systems, pile foundations, and marine structures. The key specifications of ASTM A252 Grade 3 pipes include the nominal wall thickness, outside diameter, and length. They are typically available in sizes ranging from 6 to 150 inches in diameter and can have wall thicknesses varying from 0.188 inches to 1.00 inches. The pipes are produced using electric resistance welding (ERW) or submerged arc welding (SAW) methods.

In terms of properties, ASTM A252 Grade 3 pipes exhibit high strength and excellent toughness, making them suitable for applications requiring structural integrity and load-bearing capacity. These pipes are made from carbon steel and have a minimum yield strength of 45,000 psi (310 MPa). The steel used in their construction undergoes a process known as longitudinal Charpy V-notch (LCVN) testing to ensure the required impact strength. ASTM A252 Grade 3 pipes are also designed to withstand external stresses and soil pressure, making them suitable for underground and underwater applications. They possess good corrosion resistance and can be used in various environments.

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What applications are ASTM A252 Grade 3 pipes commonly used for?

ASTM A252 Grade 3 pipes find widespread application in various industries and infrastructure projects. These pipes are commonly used in deep foundation systems, particularly for pile foundations in construction projects such as buildings, bridges, and offshore structures. Their high strength and load-bearing capacity provide reliable support and stability to structures, especially in challenging soil conditions.

Furthermore, ASTM A252 Grade 3 pipes are widely employed in marine structures, including piers, docks, and seawalls, where they can withstand the corrosive effects of saltwater environments. Their durability and resistance to external pressures make them suitable for underwater applications, such as foundation piles for offshore wind farms and oil rigs.

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Rolling and welding

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

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