Stainless Steel 347 Large Diameter Pipe

What are the main applications of stainless steel 347 / 347H large-diameter pipes?

Stainless Steel 347 / 347H Large-Diameter Pipes find extensive applications in various industries due to their exceptional properties. One of the primary applications is in the petrochemical industry, where these pipes are widely used for transporting corrosive fluids and gases. Their high resistance to intergranular corrosion and oxidation makes them ideal for handling harsh chemical environments, such as sulfuric acid and acetic acid.

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These pipes are commonly employed in the oil and gas industry for exploration, production, and refining. They are well-suited for transporting crude oil, natural gas, and petroleum products thanks to their excellent resistance to pitting and crevice corrosion. The robustness and durability of stainless steel 347 / 347H large-diameter pipes make them reliable for onshore and offshore operations.

How does the corrosion resistance of stainless steel 347 / 347H compare to other stainless steel grades?

Stainless steel 347 exhibits excellent corrosion resistance, which sets it apart from other stainless steel grades. Its resistance to intergranular corrosion is particularly noteworthy, making it highly suitable for applications involving exposure to sensitizing temperatures. This resistance is attributed to the addition of niobium (columbium) in its composition, which forms carbides and stabilizes the stainless steel structure. Compared to austenitic stainless steel grades such as 304 and 316, Stainless Steel 347 demonstrates superior resistance to chromium carbide precipitation, even after exposure to high temperatures.

Stainless steel 347H exhibits remarkable performance against various corrosive agents, including organic acids, oxidizing media, and moderately reducing environments. Its higher carbon content contributes to its improved resistance to sensitization and grain boundary corrosion, ensuring its reliability in harsh conditions.

Compared to ferritic stainless steel grades such as 430, stainless steel 347H outperforms in corrosion resistance due to its higher chromium and nickel content. It offers better pitting and crevice corrosion resistance, commonly encountered in chloride-rich environments.

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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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