Stainless Steel 310 Large Diameter Pipe

What are the advantages of using stainless steel 310/310S large-diameter pipes over other materials?

Stainless Steel 310/310S Large Diameter Pipes offer a range of advantages over other materials, making them a preferred choice for various applications. These pipes exhibit exceptional resistance to high temperatures, making them suitable for environments with extreme heat conditions. This quality allows them to maintain their structural integrity and mechanical properties even at elevated temperatures, ensuring reliable performance in demanding industrial settings.

Stainless steel 310/310S large-diameter pipes possess excellent corrosion resistance. They are highly resistant to oxidation, scaling, and sulfidation, which makes them ideal for applications involving exposure to corrosive substances such as acids, alkalis, and chlorides. This corrosion resistance significantly extends the lifespan of the pipes, reducing maintenance costs and ensuring long-term durability.

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What are the typical applications of stainless steel 310/310S large-diameter pipes?

Stainless steel 310 large-diameter pipes find many applications across various industries due to their exceptional properties and capabilities. One common application is in the petrochemical industry, where these pipes transport and process highly corrosive fluids and gases. Their resistance to oxidation and scaling makes them suitable for handling chemicals such as sulfuric acid, nitric acid, and hydrochloric acid.

In power generation, Stainless Steel 310 Large-Diameter Pipes are employed in power plants, particularly in boiler systems and heat exchangers. The pipes' ability to withstand high temperatures and thermal cycling makes them ideal for conveying steam and hot gases. They are crucial in maintaining efficient energy generation and heat transfer processes.

Stainless Steel 310S Large-Diameter Pipes find widespread application across diverse industries due to their exceptional properties and versatility. One prominent application is in the manufacturing and processing of chemicals and petrochemicals. Thanks to their excellent corrosion resistance, these pipes are commonly used for transporting corrosive chemicals, acids, and solvents. They play a crucial role in chemical plants, refineries, and storage facilities where the conveyance of aggressive substances is necessary.

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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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