Duplex Steel
Duplex Steel Products Manufacturers, Supplier and Exporter in India
Infinity Steel Industries LLP is a renowned manufacturer, supplier, and exporter of Duplex Steel Pipes & Tubes, Plates, Sheets & Coils, Bars, Rods & Wires, Fittings, Flanges, and Fasteners. Our Duplex Steel products offer excellent strength, corrosion resistance, and durability. Manufactured in compliance with ASTM and ASME standards, they are ideal for applications in oil & gas, chemical processing, marine, and power generation industries, ensuring long-lasting performance in demanding environments.
Duplex Steel Specifications
When sourcing duplex material, defining the correct specifications is crucial for project success. We provide products that adhere to major international standards like ASTM, ensuring their integrity and performance. Our products can be supplied with specific tolerances, testing, and documentation to meet your project's precise requirements.
Duplex Steel Specifications Table
| Item | Specification |
|---|---|
| Common Grades | UNS S31803 / S32205 (2205), DIN 1.4462; A182 F51 (forgings) |
| Product Standards | ASTM A790 (pipe), A789 (tube), A240 (plate/sheet), A182 (flanges/forgings), A276/A479 (bars), A815 (buttweld fittings); EN 10088-3 |
| Dimensional Refs | ASME B36.19M (pipe), ASME B16.5/B16.47 (flanges), ASME B16.9 (BW fittings), ASME B16.11 (forged fittings) |
| Finishes / Condition | Hot rolled, cold drawn, pickled & passivated, polished; solution annealed |
| Documentation | EN 10204 3.1 / 3.2 MTC, PMI, heat charts |
| Testing (options) | ASTM A923 (intermetallic), ASTM G48 (pitting), UT/ET, hydrostatic |
| Tolerances | Per ASTM/ASME/EN; tight tolerances & cut lengths on request |
Duplex Steel Chemical Composition
The unique properties of duplex steel come from its balanced chemical composition. The key alloying elements—Chromium, Molybdenum, and Nitrogen—provide enhanced strength and resistance to pitting and stress corrosion cracking.
| Grade (UNS) | Cr % | Ni % | Mo % | N % | Others |
|---|---|---|---|---|---|
| S31803 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 | C ≤0.03, Mn ≤2.0 |
| S32205 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | C ≤0.03, Mn ≤2.0 |
Duplex Steel Material Properties
Duplex Stainless Steel offers a superior combination of high tensile strength and ductility, along with excellent resistance to corrosion. These properties make it a powerful alternative to many austenitic grades.
| Property | S31803 (2205) | S32205 (2205) |
|---|---|---|
| Tensile Strength (min) | 620 MPa (90 ksi) | 620 MPa (90 ksi) |
| Yield Strength 0.2% (min) | 450 MPa (65 ksi) | 450 MPa (65 ksi) |
| Elongation (min) | 25% | 25% |
Applications of Duplex Stainless Steel
- Oil & Gas: Pipelines, risers, process equipment for resistance to chloride stress corrosion cracking (CSCC).
- Chemical Processing: Heat exchangers, pressure vessels, tanks handling aggressive media.
- Marine & Shipbuilding: Propellers, shafts, desalination plants for seawater resistance.
- Pulp & Paper Industry: Digesters, bleaching equipment resistant to corrosive chemicals.
Duplex Steel Price
The cost of duplex steel is influenced by several factors, including grade, product form, and global market conditions for alloying elements such as nickel and molybdenum.
While the initial purchase price is typically higher than standard austenitic grades like 304 or 316, its superior strength and corrosion resistance provide significant long-term value by reducing maintenance and replacement costs.
For a precise quotation tailored to your project's specific requirements, please contact our sales team.
| Frequently Asked Questions (FAQ) |
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