At Namo Alloy, we are leading exporters of high-performance Duplex (UNS S31803 / S32205) and Super Duplex (UNS S32750 / S32760) Stainless Steel Pipes. Combining the best qualities of both austenitic and ferritic steels, these "dual-phase" alloys offer nearly double the yield strength of standard stainless steels. Our Duplex pipes are specifically engineered to resist stress corrosion cracking, pitting, and crevice corrosion in high-chloride environments. Whether for offshore oil platforms, subsea flowlines, desalination plants, or complex chemical processing, our Duplex range provides the structural integrity needed to withstand extreme pressures and highly saline conditions. All products are 100% mill-certified to ASTM A790 and A928 standards.
| Grade | UNS | C (Max) | Cr | Ni | Mo | N | Mn (Max) | Cu (Max) |
|---|---|---|---|---|---|---|---|---|
| Duplex 2205 | S31803 / S32205 | 0.030 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.08 - 0.20 | 2.00 | - |
| Super Duplex 2507 | S32750 | 0.030 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | 0.24 - 0.32 | 1.20 | 0.50 |
| Grade | Tensile Strength (MPa) min. | Yield Strength 0.2% Proof (MPa) min. | Elongation (% in 50mm) min. | Hardness (Rockwell C) max. | Hardness (Brinell) max. |
|---|---|---|---|---|---|
| Duplex 2205 | 620 | 450 | 25 | 31 HRC | 293 HBW |
| Super Duplex 2507 | 795 | 550 | 15 | 32 HRC | 310 HBW |
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Specifications / Standards
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ASTM A790 / SA790 (Seamless & Welded) ASTM A928 (Filsm Welded) ASTM A815 (Fittings Grade) ASTM A182 (Flange Grade F51/F53/F55) DIN 1.4462 / 1.4410 / 1.4501 |
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Manufacturing Condition
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Seamless Welded (ERW / EFW) Cold Drawn Solution Annealed & Water Quenched |
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Outer Diameter (OD) Range
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Seamless: 1/2" NB to 12" NB Welded: 1/2" NB to 48" NB Wall Thickness: Up to 50mm (Custom heavy-wall thickness available for high-pressure subsea apps) |
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Wall Thickness / Schedule
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SCH 10S
SCH 40S
SCH 80S
SCH 160
SCH XXS
Full range of metric and imperial wall thicknesses supported. |
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Standard Lengths
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Single Random Length (SRL) Double Random Length (DRL) Fixed Length up to 12.5 Meters |
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Pipe End Connections
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Plain End (PE) Beveled End (BE) Threaded Ends (NPT/API) |
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Surface Finishes
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Pickled & Passivated (Standard) Bright Annealed (BA) Polished (Grit 240/320/400) Machine Turned (for heavy walls) |
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Testing & Certificates
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EN 10204 3.1 / 3.2 MTC ASTM G48 Pitting Test Microstructure Analysis (Ferrite Count) NACE MR0175 / ISO 15156 Compliance Ultrasonic & Radiography Testing |
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Export Packaging
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End Protectors / Caps Sea-worthy Wooden Cases Plywood Bundles Nylon Strap Lifting Belts |
Namo Alloy is a leading stockist and global exporter of premium Stainless Steel, Carbon Steel, and High Nickel Alloys.
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