Duplex Steel UNS S31803 tubes combine higher mechanical strength with excellent corrosion resistance, therefore gaining significant attention from a variety of industries. This is of a class of duplex stainless steels that obtain this unique combination of austenite and ferrite in their microstructure. A special dual-phase composition alloy that imparts to the Duplex Steel UNS S31803 tubes enhanced performance with much higher resistance against the attack of conventional austenitic or ferritic stainless steel.
Unrivaled in Composition and Properties The UNS S31803 Duplex Steel, also called the ASTM A790 designation, is an advanced class of the duplex stainless steel grade containing about 22% chromium, 5-6% nickel, and 3% molybdenum. This well-balanced chemical composition has given exceptionally good resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking.
At Adinox Overseas, we have a proud tradition of offering nothing but the best quality Duplex Steel S31803 Tubes that can be considered perfect for critical applications due to the fulfillment of very demanding industrial requirements. Besides that, these tubes have a yield strength almost double that of standard austenitic stainless steels such as 304 and 316, hence becoming the solution where durability with reduced wall thickness is important without losing strength.
Our huge inventory comprises Duplex S31803 seamless Tubes, which are used for applications in high-pressure situations and rigorous service conditions in which internal smoothness and uniformity are paramount. We also have welded Duplex S31803 Tubes for structural as well as low-pressure applications with the advantages of cost-effectiveness and superior performance. All Tubes are stocked in multiple schedules, lengths, wall thicknesses, and end finishes as per client specifications
| Specifications : | ASTM A790 / ASME SA790, ASTM A789 / ASME SA A789 |
|---|---|
| Seamless Size : | 1 / 8" NB - 24" NB |
| ERW Size : | 1 / 8" NB - 36" NB |
| EFW Size : | 6" NB - 100" NB |
| Outer Diameter : | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB |
| Length : | Single Random, Double Random & Required Length |
| Schedule : | SCH20, SCH30, SCH20, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Types : | Seamless / ERW / EFW / Welded / Fabricated / LSAW Pipes |
| Form : | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| 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 |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
|---|---|---|---|---|
| S31803 | 7.8 | 0.281 | 1350 | 2460 |
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