Stainless Steel 304 Large Diameter Pipe

What are the advantages of using stainless steel SS 304/304L large-diameter pipes?

Stainless steel 304/304L large-diameter pipes offer several advantages, making them popular in various industries and applications. Their exceptional corrosion resistance makes them suitable for environments with common exposure to moisture, chemicals, or corrosive substances. This corrosion resistance helps prolong the pipes' lifespan, reducing the need for frequent replacements and minimizing maintenance costs.

Stainless steel SS 304/304L pipes exhibit excellent strength and durability, enabling them to withstand high-pressure and high-temperature conditions. This characteristic makes them ideal for applications transporting fluids or gases under challenging operating conditions. Additionally, the high strength of stainless steel allows for thinner wall thicknesses without compromising structural integrity, resulting in lighter and more cost-effective designs.

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What industries or applications commonly utilize stainless steel 304/304L large-diameter pipes?

Stainless steel 304 large-diameter pipes find extensive utilization across various industries and applications due to their favourable characteristics and properties. The oil and gas industry is one of the primary sectors where these pipes are commonly employed. Thanks to their corrosion resistance, high strength, and ability to withstand harsh environments, they are widely used for transporting oil, gas, and other fluids over long distances. The chemical industry also relies heavily on stainless steel SS 304 large-diameter pipes. These pipes are suitable for conveying various chemicals, acids, and alkalis, as they exhibit excellent resistance to corrosion and chemical attack.

Stainless Steel 304L large-diameter pipes find extensive utilization in various industries and applications where their specific properties and characteristics are advantageous. One significant industry that commonly utilizes these pipes is the petrochemical industry. Stainless Steel 304L pipes are well-suited for transporting chemicals, gases, and corrosive substances in petrochemical processes. Their excellent corrosion resistance, high-temperature resistance, and durability make them a reliable choice for handling harsh environments and ensuring the safe and efficient transfer of petrochemical products.

The pharmaceutical and biotechnology sectors rely heavily on stainless steel 304L large-diameter pipes. These pipes meet the strict requirements of hygiene and cleanliness demanded by these industries.

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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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