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Duplex steel is a high-performance stainless steel that combines the excellent corrosion resistance of austenitic grades with the superior strength of ferritic grades. Its dual-phase microstructure provides outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion, while delivering exceptional mechanical strength and toughness. Duplex steel is widely used in industries that require reliability in extreme environments, such as offshore, chemical processing, marine, and oil & gas sectors.
| Product | Grades |
|---|---|
| Refractory Anchors | ASTM A182 F51, ASTM A182 F53, ASTM A182 F55, ASTM A182 F61, ASTM A182 F54, ASTM A182 F60, ASTM A182 F70 |
| Pipes | A790 |
| Tubes | A789 |
| Pipe Fitting | A815 |
| Forged Fitting | A182 (F51, F53, F55, F61, F54, F60, F70) |
| Flanges | A182 (F51, F53, F55, F61, F54, F60, F70) |
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) | N (%) |
|---|---|---|---|---|---|---|---|---|---|
| Duplex 2205 | 0.03 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 4.5 – 6.5 | 2.5 – 3.5 | 0.14 – 0.20 |
| Duplex 2304 | 0.03 max | 2.50 max | 1.00 max | 0.035 max | 0.015 max | 21.5 – 24.5 | 3.0 – 5.5 | 0.05 – 0.60 | 0.05 – 0.20 |
| Duplex 329 | 0.08 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 23.0 – 28.0 | 2.5 – 5.0 | 1.0 – 2.0 | – |
| Grade | Tensile Strength (MPa) | Yield Strength (0.2% Proof) (MPa) | Elongation (%) | Hardness (Brinell HB) |
|---|---|---|---|---|
| Duplex 2205 | 620 min | 450 min | 25 min | 290 max |
| Duplex 2304 | 600 min | 400 min | 25 min | 290 max |
| Duplex 329 | 650 min | 450 min | 25 min | 290 max |
Duplex steel offers a unique combination of high strength, excellent corrosion resistance, and good weldability, making it ideal for use in challenging environments such as marine, chemical processing, and oil & gas industries.
Used in tanks, piping, and heat exchangers where resistance to chloride stress corrosion cracking is crucial.
Ideal for subsea equipment, risers, and pipelines exposed to aggressive seawater and sour gas conditions.
Used for propeller shafts, offshore platforms, and seawater cooling systems due to high pitting resistance.
Applied in evaporators, pumps, and piping systems where saltwater corrosion is a major concern.
Used in heat recovery systems, condensers, and boilers for its excellent stress corrosion cracking resistance.
Preferred for hygienic processing equipment due to its strength and ease of cleaning in corrosive conditions.