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Why Use Duplex 2205 Stainless Steel in Construction

Duplex 2205 Stainless Steel Baffle

Duplex 2205 stainless steel is a popular material choice for pipes in chemical processing and oil and gas applications because it combines high strength, corrosion resistance, and toughness. These properties make it well-suited to use in environments with pipes exposed to harsh chemicals and high pressure.

Recently, the construction industry started using duplex 2205 stainless steel for cavitation baffles used in dam construction and rehabilitation. A cavitation baffle is a device used to control the flow of a fluid, and it's commonly used in situations where the fluid is at high pressure and high velocity. The high strength and corrosion resistance of duplex 2205 stainless steel make it well-suited for use in these types of applications, as it can withstand the stress and wear caused by the high-pressure fluid flow. Additionally, the toughness of the material helps it to resist deformation, which is vital in maintaining the efficiency of the cavitating baffle over time.

Due to the structural makeup of duplex 2205 stainless steel, there are some best practices to keep in mind when handling it. Here are a few tips from our team:

  • Watch the sequencing of welds for distortion control. Duplex 2205 stainless steel tends to distort more than regular grade 50 structural steel.

  • Any Potential contamination from Carbon Steel requires pickling and passivation upon completion of welding.

    • Contamination can come from mixed steel facilities, tooling with mixed-use such as abrasives and hand tools, and fixturing.

  • During the welding process, managing the heat input through welding procedures and parameters to maintain the austenitic vs. ferritic properties of the heat-affected zone.

  • "In position" welding is recommended due to the heat input described above.

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