Stainless Steel Large Diameter Pipe

What are the advantages of using stainless steel large-diameter pipes in industrial applications?

Stainless Steel Large-Diameter Pipes offer numerous advantages in industrial applications. Firstly, their exceptional corrosion resistance is a key benefit. Stainless steel is highly resistant to rust, oxidation, and corrosion caused by chemicals, making it ideal for environments where exposure to corrosive substances is common. This resistance extends the lifespan of the pipes and reduces the need for frequent replacements or repairs, ultimately leading to cost savings.

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Secondly, stainless steel large-diameter pipes possess impressive strength and durability. They can withstand high pressures and resist impacts, making them suitable for transporting fluids or gases in demanding industrial settings. The inherent strength of stainless steel also allows for the construction of large-diameter pipes with thinner walls, reducing weight and saving on material costs.

Furthermore, stainless steel large-diameter pipes are known for their hygienic properties. They are non-porous and easy to clean, making them ideal for applications where maintaining cleanliness and preventing contamination is critical, such as in the food and beverage industry or pharmaceutical sector.

How does the corrosion resistance of stainless steel large-diameter pipes compare to other materials?

Regarding corrosion resistance, Stainless Steel Large-Diameter Pipes outshine many other materials commonly used in industrial applications. The unique composition of stainless steel, which includes a high percentage of chromium, forms a protective oxide layer on the surface when exposed to oxygen. This passive layer is a barrier, shielding the underlying metal from corrosive agents.

Compared to materials like carbon steel or galvanized steel, stainless steel offers superior resistance to corrosion. Carbon steel is vulnerable to rusting and requires additional coatings or treatments to protect against corrosion. On the other hand, galvanized steel is coated with a layer of zinc for protection. While galvanized steel provides moderate corrosion resistance, it may deteriorate over time, especially when exposed to harsh chemicals or 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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