Duplex stainless steel features a balanced microstructure of both austenitic and ferritic grains, providing a unique combination of high strength and exceptional corrosion resistance. Designed to solve the failure points of standard 300-series steels, Duplex is the premier choice for high-pressure environments and aggressive chemical processing.
By utilizing a 22% Chromium and 5% Nickel composition, Duplex 2205 offers significantly higher resistance to localized corrosion—such as pitting and crevice attack—than Grade 316L. Its high mechanical strength allows for thinner wall thicknesses and overall weight reduction in complex structural designs.
| Grade | Cr (Chromium) | Ni (Nickel) | Mo (Molybdenum) | N (Nitrogen) | C (Carbon) | Mn (Manganese) | Si (Silicon) | P (Phosphorus) | S (Sulfur) |
|---|---|---|---|---|---|---|---|---|---|
| Duplex 2205 (S32205) | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.14 - 0.20 | 0.030 max | 2.00 max | 1.00 max | 0.030 | 0.020 |
| Lean Duplex 2101 (S32101) | 21.0 - 22.0 | 1.35 - 1.70 | 0.1 - 0.8 | 0.20 - 0.25 | 0.040 max | 4.0 - 6.0 | 1.00 max | 0.040 | 0.030 |
| Grade | Tensile Strength (MPa) | Yield Strength (0.2% Offset MPa) | Elongation (%) | Hardness (Brinell / HRC) | PREN Value | Density (kg/m³) |
|---|---|---|---|---|---|---|
| Duplex 2205 | 620 min | 450 min | 25% min | 293 max / 31 HRC | 34 - 36 | 7800 |
| Lean Duplex 2101 | 650 min | 450 min | 30% min | 290 max / 30 HRC | 26 - 28 | 7700 |
High-Pressure Seawater Piping
High-strength seamless and welded pipes engineered for superior resistance to chloride stress corrosion cracking (SCC). Duplex 2205 provides double the mechanical strength of austenitic steels, making it the standard for offshore flowlines and chemical processing.
SCC Resistant Connectors
A complete range of buttweld and high-pressure forged fittings. These components maintain the critical 50/50 phase balance of austenite and ferrite, ensuring uniform corrosion resistance throughout the piping system.
Weight-Saving Structural Plate
High-yield flat products used for fabricating pressure vessels, cargo tanks for chemical tankers, and structural components in bridges where high strength and corrosion resistance are required to reduce section thickness.
Offshore Grade Sealing
Forged flanges designed for extreme durability in seawater intake and chemical discharge lines. Duplex flanges offer high resistance to erosion-corrosion and pitting in aggressive environments.
High-Strength Shafting
Machining-quality bars used for pump shafts, fasteners, and boat shafts. Offers excellent fatigue strength and impact resistance even at sub-zero temperatures.
Dhanavir Steel is a premier stockholder and global supplier of high-performance Stainless Steel, Special Alloys and Nickel Alloys.
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Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.
Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.