Super Duplex 2205 (UNS S32205 / S31803) Properties & Specs | HT PIPE

Super Duplex 2205 stainless steel Suppliers,Manufacturer

UNS S32205, also known as Duplex 2205, is a high-performance duplex stainless steel that offers a unique combination of mechanical strength and corrosion resistance. The 2205 contains around 22% chromium and 5% nickel, with additional alloying elements such as molybdenum and nitrogen enhancing its performance.

Its dual-phase microstructure-comprising a mix of austenite and ferrite-is responsible for its excellent balance between toughness, strength, and resistance to various forms of corrosion. HT PIPE is a S32205 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

duplex sS uNS s31803 chemical composition

The chemical makeup of S32205 contains approximately 22 to 23 percent chromium that forms a stable passive film to protect against corrosion, while its nickel content, ranging between 4.5 and 6.5 percent, contributes to the stabilization of the austenitic phase. Molybdenum, present in amounts of around 3.0 to 3.5 percent, significantly enhances its resistance to pitting and crevice corrosion.

duplex steel 1.4462 Mechanical Properties

The 2205 duplex microstructure imparts a yield strength nearly twice that of conventional austenitic stainless steels while maintaining good ductility and toughness. The balanced microstructure ensures that the material can withstand cyclic loading and high-pressure conditions, characteristics that are particularly important in industrial applications. 

f51 material Physical Properties

With an elastic modulus of about 200 GPa, ss2205 material behaves in a manner similar to many high-performance steels, which means it supports significant loads while maintaining dimensional stability. The density, thermal conductivity, and specific heat capacity of this steel make it suitable for applications where thermal management is important. Although its thermal conductivity helps in quickly dissipating heat during manufacturing processes, its performance is limited at elevated temperatures due to the risk of embrittlement.

S32205 Material Testing

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and MacroTest
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test

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s32205 stainless steel Corrosion Resistance

One of the primary advantages of S32205 is its outstanding resistance to corrosion, which is a direct benefit of its well-balanced chemical composition. The high chromium, molybdenum, and nitrogen content create a protective passive layer that shields the steel from severe corrosion in chloride-rich environments. This material is especially effective against pitting and crevice corrosion, phenomena that are frequently encountered in marine, offshore, and chemical processing applications.

eN 1.4462 Fabrication

The fabrication of S31803 requires careful attention due to its high strength and specific thermal sensitivities. When machining this material, the high work-hardening tendency means that tools must remain exceptionally sharp, and cutting conditions must be optimized to manage the increased forces required.

duplex steel uNS s31803 Welded

S32205 responds well to conventional processes such as Gas Tungsten Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), and Shielded Metal Arc Welding (SMAW). Special filler metals are typically used, which are slightly over-alloyed to preserve the desirable phase balance.

sA 240 s32205 Industrial Applications

• Oil and Gas: Used in downhole tubing, pipelines, and pressure vessels due to its resilience in sour service environments.
• Desalination and Marine: Employed in heat exchangers, reverse osmosis membranes, and shipbuilding components exposed to seawater.
• Chemical Processing: Ideal for reactors, storage tanks, and piping handling acidic or chloride-containing fluids.
• Architecture: Structural elements in coastal buildings where salt spray accelerates corrosion.
• Pulp and Paper: Withstands corrosive bleaching chemicals and high-temperature processes.

Frequently Asked Questions (FAQ)

Is Super Duplex 2205 magnetic?

Yes. Due to its 50% ferritic phase, 2205 Duplex is magnetic, unlike standard 300-series austenitic steels.

What is the difference between UNS S31803 and S32205?

S32205 is a restricted-chemistry version of S31803 with higher minimum levels of Chromium, Nitrogen, and Molybdenum, providing better corrosion resistance.

What is the maximum service temperature for 2205?

While it has excellent strength, it is generally limited to services below 300°C (572°F) to avoid the "475°C embrittlement" phase.

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