Product Description

Product Introduction: Duplex 2205 Alloys

Duplex 2205 alloys, recognized by their UNS designations S32205 and S31803, are distinguished for their exceptional combination of strength and corrosion resistance, making them a preferred material choice in various industrial applications. This introduction delves into the physical properties, chemical composition, product specifications, and practical uses of Duplex 2205 alloys in the annealed condition, specifically in temperatures from -20°F to +100°F.

Physical Properties

The outstanding mechanical properties of Duplex 2205 alloys are crucial for their performance in demanding environments. With a tensile strength measuring up to 95,000 psi (655 MPa) and a yield strength of 70,000 psi (485 MPa), these alloys exhibit remarkable durability under stress. Additionally, Duplex 2205 alloys have minimum elongation of 30% in a 2-inch gauge length, revealing their ability to undergo significant deformation without rupture.

The alloy's hardness characteristics are equally noteworthy, with a maximum hardness rating of 28-30 Rockwell C. Such properties ensure sufficient toughness for various applications while maintaining flexibility. The modulus of elasticity stands at 27.5 x 10^6 psi, further solidifying its structural integrity in dynamic conditions. The mean coefficient of thermal expansion is 7.6 x 10^-6 in/in/°F, which offers limited expansion during temperature shifts, ensuring dimensional stability throughout operations. Thermal conductivity, rated at 180 BTU-in/ft²-h-°F, suggests effective thermal management, contributing to the material's versatility in heat-exchanging applications.

Chemical Composition

The composition of Duplex 2205 significantly enhances its performance attributes, particularly its resistance to pitting and crevice corrosion. The key elements include 22.0–23.0% chromium, 4.5–6.5% nickel, and 3.0–3.5% molybdenum, all contributing to its robustness against corrosive environments, particularly in chloride-rich settings.

Other critical components include a maximum carbon content of 0.030%, manganese up to 2.00%, phosphorus at 0.030%, and sulfur at 0.020%. The presence of nitrogen at 0.14–0.20% further bolsters the alloy's mechanical strength. The chemical balance of iron as the primary element reinforces the alloy’s structural framework, while copper is not present in the formulation. Duplex 2205 (S32205) represents the more stringent of the two alloy compositions and is ideal for high-performance applications.

Product Range and Specifications

Duplex 2205 alloys are commonly available in various forms, including welded pipes, tubes, and fittings, complying with ASTM-A789 and ASME-SA789 standards. The typical outer diameters (OD) range from 3/16" (4.76 mm) to 4" (101.6 mm), catering to diverse industry requirements, including both imperial and metric sizes. Wall thickness options range from 0.020" (0.51 mm) to 0.220" (5.59 mm), available in random lengths, cut lengths up to 68' (20.7 m), or coils up to 80,000' (24,384 m).

The dimensional tolerances for products allow for precise manufacturing, with specifications such as ±0.005" (0.13 mm) for sizes under 1-1/2" OD and up to ±0.015" (0.38 mm) for larger dimensions. This level of precision ensures optimal fitment and performance in applications.

Applications

Due to their high strength and excellent corrosion resistance, Duplex 2205 alloys are widely utilized in the oil and gas industry, particularly for applications such as pipelines, heat exchangers, and pressure vessels that require resilience against harsh environmental conditions. Moreover, their thermal performance lends them effectively to the fabrication of boiler tubes and superheaters in various industrial processes.

In the chemical processing sector, Duplex 2205 is preferred for piping systems handling aggressive chemicals and environments where microbial-induced corrosion may be a concern. The combination of strength and durability ensures that units made from this alloy can withstand challenging conditions while minimizing service disruptions.

Conclusion

Duplex 2205 alloys stand out as a powerful material solution for industries demanding high strength and exceptional corrosion resistance. Enabled by outstanding mechanical properties and a robust chemical composition, these alloys are ideal for a wide range of applications—ensuring performance, reliability, and durability in the most challenging environments. Whether employed in the oil and gas sector, chemical processing industries, or critical infrastructural systems, Duplex 2205 continues to provide unmatched performance and engineering reliability for modern applications.

Packing︰ Wooden box

Product Image