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Duplex Steel S31803 Threaded Bars Overview
Aurum Overseas is a premier Duplex Steel S31803 Threaded Bars Supplier and leading Duplex Steel S31803 Threaded Bars Exporter, offering high-strength 22% Chromium fasteners made to standard dimensions. Our inventory of ASTM A276 UNS S31803 Threaded Bars holds strong under heavy mechanical loads while resisting chloride pitting and crevice rust.
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Built with a balanced 50/50 dual-phase structure, certified ASTM A479 UNS S31803 Threaded Bars provide twice the yield strength of standard 300-series stainless steels. Enriched with Molybdenum and Nitrogen, durable Duplex Steel S31803 Threaded Rods ensure exceptional performance in acidic, saline, and chemical processing fluids.
Built for subsea manifolds, offshore risers, reverse osmosis systems, and storage tanks, our Duplex Steel F51 Threaded Rods maintain leak-free seals without stress cracking. Contact Aurum Overseas for factory quotes, custom length sawing, and fast global shipping.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM A276, ASTM A479, ASME SA276, ASME SA479, EN 10204 3.1 |
| UNS Designation | UNS S31803 (Duplex 2205 / F51) |
| Werkstoff Number | W.Nr. 1.4462 (X2CrNiMoN22-5-3) |
| Thread Size Range | M6 to M100 (1/4" to 4.0" Nominal Diameter) |
| Thread Profiles | UNC, UNF, UNEF, Metric Coarse, Metric Fine, Acme Threads |
| Length Options | 1,000 mm, 2,000 mm, 3,000 mm, Custom Cut-to-Length All-Thread Studs |
| Thread Class / Fit | Class 2A / 3A (Imperial) & 6g / 6h (Metric Profile Tolerances) |
| HSN Code | 73181500 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | W.Nr. | UNS |
|---|---|---|---|
| Duplex Steel S31803 | ASTM A276 / A479 | 1.4462 | S31803 |
Chemical Composition (%)
| Chemical Element | Duplex Steel S31803 (UNS S31803) |
|---|---|
| Chromium (Cr) | 22.00 – 23.00 |
| Nickel (Ni) | 4.50 – 6.50 |
| Molybdenum (Mo) | 3.00 – 3.50 |
| Nitrogen (N) | 0.14 – 0.20 |
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.020 max |
| Iron (Fe) | 63.72 min |
Mechanical & Physical Properties
| Property Parameter | Value / Compliance Boundary |
|---|---|
| Density | 7.805 g/cm³ (0.285 lb/in³) |
| Melting Point | 1420 – 1465 °C (2588 – 2669 °F) |
| Tensile Strength (Min) | 620 MPa (90,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 450 MPa (65,000 Psi) |
| Elongation (Min) | 25 % |
| Hardness (Max) | 31 HRC / 293 HBW |
Key Advantages of Duplex Steel F51 Threaded Rods
Double the Strength
Dual-phase microstructural balance delivers twice the load-bearing capacity of standard 316L, letting you use lighter studs without losing joint clamping force.
Resists Saltwater Pitting
Combined Chromium (22–23%), Molybdenum (3–3.5%), and Nitrogen stop severe hole pitting and crevice rust in salty seawater.
No Stress Cracking
Ferritic phase structure protects studs from sudden cracking and breaking in hot marine and brackish chemical environments.
Smooth & Secure Threading
Roll-threaded construction prevents thread stripping and jamming when tightening under heavy assembly loads.
Quality Testing & Inspection
Aurum Overseas subjects every order to strict quality control processes to ensure compliance with international fastener standards and client specifications:
- Chemical Heat Verification (PMI): Spectro / XRF material analysis verifying exact elemental chemistry against ASTM standards.
- Thread Pitch & Gage Inspection: Go/No-Go thread gage and optical comparator testing ensuring class 2A/3A and 6g pitch tolerances.
- Mechanical Property Certification: Factory batch verification of tensile, yield strength, and elongation supported by EN 10204 3.1 MTRs.
- Optional Third-Party Testing: Ferrite count testing (ASTM E562), Corrosion resistance testing (ASTM G48 Method A), or Proof Load testing provided upon request.
Global Export Markets
As an established Duplex Steel S31803 Threaded Bars Exporter, Aurum Overseas supplies fully certified ASTM A276 / A479 UNS S31803 threaded rods to global chemical processing, offshore, desalination, and high-strength industrial facilities:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
It mixes two metal structures (austenite and ferrite) in a 50/50 balance, giving it double the strength of standard 316L stainless steel.
Yes. They stay tough and hold heavy loads down to -50 °C (-58 °F) without snapping, making them ideal for cold-climate and arctic oilfield jobs.
They should not be used in continuous heat above 300 °C (572 °F) to keep the metal from becoming brittle over time.
They are widely used in desalination plants, offshore oil rigs, and gas processing facilities across the UAE, Saudi Arabia, Qatar, and Oman due to their strong resistance to hot saltwater and sour gas environments.
Yes. Facilities across Germany, the Netherlands, Italy, and the UK rely on Duplex S31803 studs for storage tanks, acid pipelines, and heat exchangers that demand high strength and corrosion protection.
Contact Aurum Overseas
Contact Aurum Overseas, a trusted Duplex Steel S31803 Threaded Bars Supplier & Exporter, for certified high-strength alloy threaded rods, custom length sawing, and fast international delivery.