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Duplex Steel

duplex super duplex products
Duplex and Super Duplex stainless steels are advanced alloys known for their exceptional strength, high corrosion resistance, and superior mechanical properties. These steels have a unique dual-phase microstructure, combining both austenitic and ferritic phases, which provides enhanced toughness, increased durability, and resistance to stress corrosion cracking. Compared to conventional stainless steels, Duplex and Super Duplex offer higher strength, improved resistance to pitting and crevice corrosion, and better performance in extreme environments.
ASTM/ASME

Duplex & Super Duplex Specifications

Standard

ASTM, ASME, EN, DIN, ISO, JIS

Grades

Duplex 2205 (UNS S31803/S32205), Super Duplex 2507 (UNS S32750/S32760), UNS S32550, UNS S32950, UNS S31254

Applications

Oil & Gas, Marine, Offshore Structures, Chemical Processing, Desalination Plants, Pulp & Paper, Power Generation, Heat Exchangers, Pressure Vessels

ASTM/ASME

A182, A240, A276, A479, A789, A790, A815, A928, A995

Forms and Products

Pipes and Tubes, Buttweld Fittings, Flanges, Forged Fittings, Sheets, Plates, and Coils, Bars and Rods, Fasteners, Filler Wire, Outlet

Properties

High Strength, Excellent Corrosion Resistance, Superior Stress Corrosion Cracking (SCC) Resistance, High Pitting and Crevice Corrosion Resistance, Improved Weldability
Available in all grades

Duplex & Super Duplex Products

flanges suppliers
Flanges
ASME B16.5, B16.47, MSS-SP-44
buttweld suppliers
Buttweld Fittings
ASME B16.9, B16.28, MSS-SP-43
forged suppliers
Forged Fittings
ASME B16.11, MSS-SP-79, 83, 97
fasteners suppliers
Fasteners
ASME B18.2.1, B18.2.2
pipes tubes suppliers
Pipes Tubes
ASME B36.10, EN 10217 / EN 10216
outlets suppliers
Outlets
MSS-SP-97, ASME B16.11
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ASTM / ASME

Equivalent Grades

Steel Grade Type ASTM EN (DIN) BS JIS GOST
UNS S31803 Duplex A790/A815 1.4462 32205S31 SUS329J3L 08X18H10
UNS S32205 Duplex A790/A815 1.4410 32205S31 SUS329J3L 08X19H10
UNS S32750 Super Duplex A790/A815 1.4410 2507S31 SUS329J3L 08X22H6
UNS S32760 Super Duplex A790/A815 1.4501 2507S31 SUS329J4L 08X23H6
ASME / ASTM

Chemical Composition

Grade C Mn Si P S Cr Ni Mo N Fe
Duplex (UNS S31803) ≤ 0.03 1.0-2.0 0.5-1.0 ≤ 0.03 ≤ 0.01 18.0-20.0 4.5-6.5 2.5-3.5 0.08-0.2 Balance
Duplex (UNS S32205) ≤ 0.03 1.0-2.0 0.5-1.0 ≤ 0.03 ≤ 0.01 22.0-24.0 4.5-6.5 3.0-4.0 0.10-0.20 Balance
Super Duplex (UNS S32750) ≤ 0.03 1.0-2.0 0.5-1.0 ≤ 0.03 ≤ 0.01 24.0-26.0 6.0-8.0 3.5-4.5 0.20-0.30 Balance
Super Duplex (UNS S32760) ≤ 0.03 1.0-2.0 0.5-1.0 ≤ 0.03 ≤ 0.01 25.0-27.0 6.0-8.0 4.0-5.0 0.20-0.30 Balance
ASME / ASTM

Mechanical Properties

Property Duplex (UNS S31803) Duplex (UNS S32205) Super Duplex (UNS S32750) Super Duplex (UNS S32760)
Tensile Strength (MPa) ≥ 620 ≥ 620 ≥ 750 ≥ 800
Yield Strength (MPa) ≥ 450 ≥ 450 ≥ 550 ≥ 600
**Elongation (%) ≥ 25 ≥ 25 ≥ 25 ≥ 25
Hardness (HB) ≤ 300 ≤ 300 ≤ 300 ≤ 300
Impact Toughness (J) ≥ 40 (at -40°C) ≥ 40 (at -40°C) ≥ 50 (at -40°C) ≥ 50 (at -40°C)