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Super Duplex Steel is a high-performance alloy combining the excellent corrosion resistance of austenitic stainless steel with the high strength of ferritic grades. Containing elevated levels of chromium, molybdenum, and nitrogen, it offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride-rich environments. Grades such as 2507 and Ferralium® 255 are widely used in demanding industries including offshore oil & gas, chemical processing, desalination, and marine engineering, where both strength and corrosion resistance are critical.
| Product | Grades |
|---|---|
| Super Duplex Steel | ASTM A182 F2507, ASTM A182 F255, ASTM A182 F53, ASTM A182 F55 |
| 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 (%) | Cu (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| Super Duplex 2507 | 0.03 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 5.0 | 0.24 – 0.32 | 0.50 max |
| Super Duplex 255 (Ferralium® 255) | 0.04 max | 1.50 max | 1.00 max | 0.040 max | 0.030 max | 24.0 – 26.5 | 4.5 – 6.5 | 2.9 – 3.9 | 0.10 – 0.25 | 1.5 – 2.5 |
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| Super Duplex 2507 | 800 min | 550 min | 25 min | 310 max |
| Super Duplex 255 (Ferralium® 255) | 750 – 850 | 550 – 620 | 15 – 25 | 290 max |
Super duplex steel combines exceptional strength, superior corrosion resistance, and excellent resistance to chloride stress corrosion cracking, making it ideal for the most demanding environments such as deepwater oil & gas, desalination, and aggressive chemical processing industries.
Ideal for subsea pipelines, risers, manifolds, and umbilicals exposed to high pressure and corrosive seawater.
Used in reactors, heat exchangers, and pressure vessels handling strong acids, chlorides, and other aggressive chemicals.
Applied in shipbuilding, propeller shafts, and seawater cooling systems for high pitting and crevice corrosion resistance.
Ideal for high-pressure evaporators, brine heaters, and seawater intake piping where saltwater corrosion is severe.
Used in flue gas desulfurization units, condensers, and high-temperature heat recovery systems.
Resists aggressive bleaching agents and high chloride process water in digesters and bleaching plants.