What Are Duplex & Super Duplex Steel Pipes? Uses in Oil & Gas
In offshore and high-chloride environments where standard stainless steel fails, duplex and super duplex stainless steel pipes offer a superior solution — combining high strength with exceptional corrosion resistance. This guide explores duplex steel pipe UAE suppliers, super duplex pipe suppliers UAE, and SS duplex pipe oil gas applications, with Metal Junction FZE as your trusted stockiest for UAE, Africa, and global delivery.
What is Duplex Stainless Steel?
Duplex stainless steel features a mixed microstructure of austenite and ferrite phases, typically 50/50, providing balanced properties. Common grade UNS S31803 (2205) offers yield strength over 450 MPa, double that of 316L, with excellent pitting resistance via PREN ~35. It resists stress corrosion cracking (SCC) in chloride-rich settings.
Mechanical properties include tensile strength 620-860 MPa, elongation 25% min, and hardness ≤28 HRC. Ideal for moderate seawater exposure. Long-tail keywords like “duplex steel pipe UNS S31803 UAE stockist” reflect demand in ADNOC and Aramco projects.
What is Super Duplex Steel?
Super duplex stainless steel, like UNS S32750 (2507), boosts ferrite content with higher Cr, Mo, N for PREN >40, enhancing pitting and crevice corrosion resistance. Yield strength exceeds 550 MPa, suited for extreme conditions.
Applications span deep subsea tiebacks and acidic sour service. It withstands temperatures up to 250°C continuously. As super duplex pipe suppliers UAE, Metal Junction FZE stocks these for North Field expansions and African FPSOs.
Superior to duplex in severe chloride and H2S environments, with tensile 800-1000 MPa.
Duplex vs SS 316L vs Carbon Steel
Duplex outperforms SS 316L in strength and corrosion resistance, while carbon steel excels in cost but fails in corrosive media.
| Property | Duplex 2205 | SS 316L | Carbon Steel A106 Gr B |
|---|---|---|---|
| Yield Strength (MPa) | 450 | 220 | 240 |
| PREN | 35 | 24 | N/A |
| Corrosion Resistance | High (seawater) | Moderate | Poor |
| Cost | Medium-High | Medium | Low |
| Oil & Gas Use | Subsea, topsides | General | Non-corrosive lines |
duplex vs 316L pipe comparison UAE oil gas.
Why Duplex Is Used in Oil & Gas
Duplex pipes handle seawater injection, fire water systems, and desalination plants in offshore platforms. Their high strength reduces wall thickness, cutting weight by 30-50% vs CS.
Subsea umbilicals and topsides piping resist SCC; used in Qatar North Field, Jafurah, and Libya fields. SS duplex pipe oil gas prevents failures costing millions in downtime.
Available Forms
Available as seamless (ASTM A790) and welded (A928) pipes, plus fittings (A815), flanges (A182 F51/F53/F55). Sizes: NPS 1/8-24″, SCH 10-160, OD up to 609mm.
Metal Junction FZE, duplex steel pipe UAE supplier, stocks seamless 2205 for immediate dispatch to Africa projects.
Key Standards
ASTM A790/A928 cover seamless/welded duplex pipes; A182 F51 (2205), F55 (2507) for flanges/forgings. NACE MR0175/ISO 15156 certifies sour service.
ASME B36.19 dimensions ensure compatibility. “Super duplex pipe standards UAE stockiest” keywords target compliance needs.
Contact Us
Contact Metal Junction FZE, premier duplex steel pipe UAE and super duplex pipe suppliers UAE, for SS duplex pipe oil gas quotes. Fast delivery across UAE, Africa, worldwide. Email: sales@metaljunction.me
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