Low Temperature Carbon Steel Large Diameter Pipes

What are the advantages of using low-temperature carbon steel large-diameter pipes in various industries?

Low-temperature Carbon Steel Large-Diameter Pipes offer several advantages that make them highly suitable for various industries. Their low-temperature resistance is a key benefit. These pipes are designed to withstand extremely cold temperatures, making them ideal for applications in oil and gas, petrochemical, and cryogenic facilities. Their ability to maintain structural integrity and perform reliably in sub-zero environments is crucial for transporting fluids or gases in extremely cold conditions.

Another advantage of low-temperature carbon steel large-diameter pipes is their high strength and toughness. These pipes are manufactured with carbon steel that possesses excellent mechanical properties, enabling them to withstand high pressure and impact loads. This strength and toughness make them reliable and durable for demanding applications, including offshore oil platforms, refineries, and pipelines.

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Additionally, low-temperature carbon steel large-diameter pipes exhibit good weldability, allowing for efficient installation and maintenance. The welding process ensures tight and secure joints, minimizing the risk of leakage or structural failure. This feature is particularly important in industries where safety and reliability are paramount.

What are the key characteristics and properties of low-temperature carbon steel make it suitable for large-diameter pipe applications?

Low-temperature carbon steel possesses key characteristics and properties that make it highly suitable for large-diameter pipe applications. Firstly, it exhibits excellent toughness even at extremely low temperatures. This property ensures that the pipes can withstand the stresses and strains imposed on them while transporting fluids or gases in cold environments without undergoing brittle fracture. The toughness of low-temperature carbon steel enables it to maintain its structural integrity and avoid catastrophic failures.

Secondly, low-temperature carbon steel has good weldability. This characteristic is crucial for large-diameter pipe applications as it facilitates the efficient joining of pipe sections during installation or repairs. The ability to weld the pipes effectively ensures tight and secure joints, reducing the risk of leakage and enhancing the overall integrity of the pipeline system.

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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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