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Duplex and Super Duplex stainless steels are high-performance alloys composed of a balanced microstructure of austenite and ferrite phases. This dual-phase structure provides superior strength, excellent resistance to stress corrosion cracking, and enhanced durability compared to standard austenitic stainless steels. They are widely used in the offshore, petrochemical, desalination, and marine industries.
Super Duplex grades, such as UNS S32750 and S32760, offer even greater corrosion resistance and mechanical strength, making them suitable for highly aggressive environments involving chlorides and other harsh chemicals. These alloys conform to international standards such as ASTM A790, ASTM A815, and ASME SA790, delivering reliability and longevity in critical applications where conventional stainless steel may fail.
Standard: ASTM A790, A789 / ASME SA790, SA A789
Size: 1/2" TO 48" NB
Grade: UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Standard: ASTM / ASME A815 / SA815
Size: 1/2" to 24" NB in Sch 10S, 40S, 80S, 160S, XXS
Grade: UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Standard: ASTM A240 / ASME SA240
Size: 5 mm to 100 mm thick, Width: 1000 mm to 2500 mm, Length: 2500 mm to 12500 mm
Form: Coils, foils, shim sheet, perforated sheet, strip, flats, blank (circle), ring (flange), etc.
Grade: UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Standard: ASTM A193 / ASTM A194
Size: M10 to M100
Length: Up to 5 meters
Grade: UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Standard: ASTM A182 / ASME SA182
Size: 1/8" NB to 24" NB
Class: 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64, etc.
Grade: UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Size: 10 mm to 100 mm diameter, Length: 100 mm to 6000 mm
Form: Round, Square, Hex (A/F), Bush, Rectangle, Flat
Grade: ASTM / ASME SA182, A276, A479, UNS NO. S31803 (Duplex), S32750 / S32760 / S32950 (Super Duplex)
Size: Width 1 mm to 250 mm, Length 100 mm to 6000 mm
Grade: Duplex Steel 2205 (UNS No. S31803), Super Duplex 2507 (UNS No. S32750)
Size: 1/2" NB to 4" NB
Standard: ASTM A182 / ASME SA182
Grade: UNS S31803 (Duplex), S32750, S32760, S32950 (Super Duplex)
Dimensions: ASTM, ASME, API
Specifications: API 600/BS1414, API 598/BS EN 12266-1, ASME B16.10, B16.5, B16.25, B16.34
Grade: UNS S31803 (Duplex), S32750, S32760, S32950 (Super Duplex)
Size: 1/8” to 16”
Pressure Rating: 150#, 300#, 600#, 800#, 1500#
| Element | Duplex Steel (UNS S31803 / 2205) | Super Duplex Steel (UNS S32750 / 2507) |
|---|---|---|
| Carbon (C) | ≤ 0.03% | ≤ 0.03% |
| Chromium (Cr) | 21 - 23% | 24 - 26% |
| Nickel (Ni) | 4.5 - 6.5% | 6 - 8% |
| Molybdenum (Mo) | 2.5 - 3.5% | 3 - 5% |
| Nitrogen (N) | 0.08 - 0.20% | 0.24 - 0.32% |
| Manganese (Mn) | 1.0 - 2.0% | 1.0 - 2.0% |
| Silicon (Si) | 0.7 - 1.2% | 0.7 - 1.2% |
| Iron (Fe) | Balance | Balance |
| Property | Duplex Steel (UNS S31803 / 2205) | Super Duplex Steel (UNS S32750 / 2507) |
|---|---|---|
| Yield Strength (MPa) | 450 - 550 | 550 - 750 |
| Tensile Strength (MPa) | 620 - 800 | 750 - 900 |
| Elongation (%) | 25 - 35 | 20 - 30 |
| Hardness (HB) | 230 - 280 | 280 - 320 |
| Impact Toughness (J) | 70 - 100 (at -40°C) | 50 - 80 (at -40°C) |