Stainless Steel 316H Large Diameter Pipe

What are the advantages of choosing a Stainless Steel 316H Large Diameter Pipe over other materials?

Stainless Steel 316H Large Diameter Pipe offers several advantages over other materials, making it a preferred choice in various applications. Its exceptional corrosion resistance sets it apart. The high levels of chromium, nickel, and molybdenum present in Stainless Steel 316H provide excellent resistance to corrosion, especially in harsh environments involving acids, chemicals, and chloride-containing solutions. That makes it suitable for chemical processing, oil and gas, marine, and pharmaceutical industries.

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Stainless Steel 316H Large Diameter Pipe exhibits excellent strength and durability. Its high tensile strength allows it to withstand high-pressure applications and heavy loads. The material also retains its strength at elevated temperatures, making it suitable for applications requiring heat and thermal stress resistance. Additionally, its superior toughness ensures resistance against cracks and fractures, enhancing its overall reliability and longevity.

How does Stainless Steel 316H Large Diameter Pipe differ from other grades of stainless steel?

Stainless Steel 316H Large Diameter Pipe exhibits several distinct differences compared to other grades of stainless steel. Firstly, its higher carbon content sets it apart. The "H" designation in Stainless Steel 316H indicates an increased carbon content compared to standard 316 stainless steel. This higher carbon content improves high-temperature strength and creep resistance, making it suitable for elevated-temperature applications.

Stainless Steel 316H offers superior corrosion resistance to other stainless steel grades. The combination of chromium, nickel, and molybdenum in 316H contributes to its excellent resistance against corrosion, especially in aggressive environments containing corrosive substances such as acids, chemicals, and chloride solutions. That makes it a preferred choice in chemical processing, marine, and oil and gas industries.

Another distinguishing factor is the alloy's mechanical properties. Stainless Steel 316H retains its strength and structural integrity at elevated temperatures, making it suitable for high-temperature applications. Its higher carbon content enhances its resistance to sensitization, a process that can lead to the formation of chromium carbide precipitates and subsequent corrosion in certain 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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