ASTM A106 Gr. B Carbon Steel Large Diameter Pipes

What are the applications and industries that commonly use ASTM A106 Gr. B Carbon Steel Large Diameter Pipes?

ASTM A106 Gr. B Carbon Steel Large Diameter Pipes find wide-ranging applications in various industries due to their exceptional properties and reliable performance. One primary sector that commonly utilizes these pipes is the oil and gas industry. These pipes are extensively employed for transporting oil, gas, and other fluids over long distances, thanks to their high strength, durability, and resistance to corrosion. Another significant application is in the power generation industry, where large-diameter pipes are utilized for steam and water transmission in power plants.

ASTM A106 Gr. B Carbon Steel Large Diameter Pipes are frequently employed in the petrochemical industry for the transportation of chemicals and in refineries and chemical plants. Their robustness and ability to withstand high temperatures and pressures suit such demanding environments. These pipes find use in infrastructure projects, including water supply systems, bridges, and construction projects, due to their ability to handle heavy loads and provide structural stability.

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What are the key features and specifications of ASTM A106 Gr. B Carbon Steel Large Diameter Pipes?

ASTM A106 Gr. B Carbon Steel Large Diameter Pipes possess several key features and specifications that make them highly suitable for various applications. Firstly, these pipes are made from carbon steel, which gives them exceptional strength and durability. They exhibit excellent tensile strength and can withstand high-pressure conditions, making them ideal for transporting fluids long distances. Moreover, ASTM A106 Gr. B pipes have good corrosion resistance, ensuring their longevity and reliability in various environments.

These pipes also exhibit excellent weldability and formability, allowing for easy fabrication and installation. In terms of specifications, ASTM A106 Gr. B pipes adhere to the standards set by the American Society for Testing and Materials (ASTM). They have specific requirements for chemical composition, mechanical properties, and dimensional tolerances, ensuring consistent quality and performance. These pipes typically have a large diameter, enabling efficient flow of fluids and making them suitable for high-volume transportation applications.

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Forming

According to the name, the plate is bent into a "U" and then a "O" in succession. The lowering of the die starts the process of forming in the U-ing press. The side rollers move the crimped plate in the direction of the die. The O-ing press is then used to mould the U-shaped plate into a slit pipe. Working at up to 60,000 tonnes of pressure, this is precision work.

Two lower rolls and one higher roll bend the plate to the appropriate radius during the three-roll bending procedure. Different top roll diameters are employed, depending on the steel grade and necessary pipe diameter. Afterward, the crimping machine rounds the created edges.

Tack welding of the slit pipe

The open edges of the slit pipe are tacking welded together in shielding gas prior to submerged-arc welding. Frames (roller cages) are used for this, which precisely position the edges and prevent misalignment. Additionally, the continuous tack weld keeps the weld pool in place for subsequent submerged arc welding.

Pipe identification

material tracking throughout the entire production process. For identification each pipe is marked with a pipe production number. Additionally a line, marking the centre of the pipe, is the reference for late non-destructive testing of the weld seam.

Inside and outside welding

Two passes are used to attach the longitudinal edges. At the pipe ends, run-on and run-off tabs are positioned to stabilise the electric arc at the start and end of the welding process.

Outside welding is done after the inside welding has been completed. The tack weld pass has fused entirely. Up to five welding wires can be positioned in a line behind one another during submerged-arc multi-wire welding. Welding wire and flux, amperage, voltage, welding speed, wire spacing, wire diameter, the angle of the wires in relation to one another and the weld groove, as well as flux height and width, all affect how consistently good a weld is. A welding data monitoring system enables online manufacturing process monitoring.

X-ray weld inspection / Filmless radiography

Each seam is first visually inspected from the inside out. In addition to X-ray and manual ultrasonic testing, our internal quality checks also involve ultrasonic inspection of the whole seam.

When compared to traditional film-based approaches, the use of automatic picture evaluation software and image processing capabilities considerably increases the reliability of inspection and detection. Any ultrasonic signals are automatically and precisely verified. We take pride in being the only manufacturer of large-diameter pipes to use digital technology for all radiography examinations. We streamline the inspection procedure, record the findings, and keep track of any deviations for later follow-up.

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