Stainless Steel 316 Large Diameter Pipe

What are the main applications of stainless steel 316/316L large-diameter pipes?

Stainless Steel 316/316L Large-diameter Pipes find diverse applications across various industries due to their exceptional properties. One of the main applications is oil and gas, where these pipes are utilized for transporting fluids and gases in offshore and onshore drilling operations. Even in harsh environments, their corrosion resistance makes them highly suitable for this purpose. The chemical and petrochemical industries also employ these pipes for conveying corrosive chemicals and solvents, processing equipment and storage tanks.

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The pharmaceutical industry also benefits from Stainless Steel 316/316L Large-Diameter Pipes, using them to produce sterile solutions and pharmaceutical ingredients. Furthermore, these pipes play a crucial role in the food and beverage industry, particularly in transporting liquids, oils, and gases, thanks to their hygienic properties and resistance to pitting and crevice corrosion. The construction sector uses them for plumbing, heating, and ventilation systems due to their durability and longevity. These applications highlight the versatility and reliability of stainless steel 316/316L large-diameter pipes in various industrial sectors.

What are the key properties and advantages of using stainless steel 316/316L large-diameter pipes?

Stainless Steel 316 Large-Diameter Pipes offer a range of key properties and advantages that make them highly desirable in numerous applications. One significant property is their excellent corrosion resistance, particularly in aggressive environments containing chlorides, acids, and other corrosive substances. This corrosion resistance helps to ensure the longevity and durability of the pipes, reducing the need for frequent maintenance or replacement. Another important property of stainless steel 316 large-diameter pipes is their high-temperature resistance, allowing them to withstand elevated temperatures without structural degradation.

Stainless Steel 316L Large-Diameter Pipes offer a range of key properties and advantages that make them highly advantageous in numerous applications. One of the primary properties is their superior corrosion resistance, even in highly corrosive environments containing chlorides and acids. This exceptional corrosion resistance ensures the longevity and reliability of the pipes, reducing the risk of leaks or failures. Additionally, stainless steel 316L large-diameter pipes exhibit excellent pitting and crevice corrosion resistance, further enhancing their durability in challenging conditions.

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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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