Duplex and Super Duplex
Duplex and super duplex stainless steels represent a class of materials renowned
for their exceptional combination of strength, corrosion resistance, and
cost-effectiveness. These alloys, which contain a balanced mixture of austenite
and ferrite microstructures, offer superior performance in harsh environments
compared to conventional stainless steels.
One of the primary advantages of duplex and super duplex stainless steels is
their outstanding resistance to corrosion, particularly in chloride-rich
environments such as seawater and chemical processing plants.
This corrosion resistance stems from the alloy's high chromium and
molybdenum content, which form a protective passive film on the surface,
effectively preventing pitting, crevice corrosion, and stress corrosion
cracking.
Moreover, duplex and super duplex stainless steels exhibit exceptional
mechanical properties, including high tensile strength and toughness. This
combination of strength and ductility makes these alloys well-suited for
structural applications in industries such as oil and gas, offshore drilling,
and marine engineering, where reliability and durability are critical.
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ASTM A815 / A182 / A789 / A790 / A240
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Buttweld Pipe Fittings, Forged Fittings, Flanges, Pipes, Tubes, Round Bar, Sheets, Fasteners, Gaskets
Duplex and Super Duplex products
Buttweld Fitting
Forged Fitting
Flanges
Pipes
Tube
GENERAL INFORMATION
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex S31803 | 1.4462 | S31803 |
| Duplex 2205 | 1.4462 | S32205 |
| Super Duplex 2507 | 1.4410 | S32750 / S32760 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
| S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| S32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
| S32750 / S32760 | 7.8 | 0.281 | 1350 | 2460 |
