Table of Contents
- Duplex Steel S31803 Round Bar Overview
- Technical Specifications
- Mechanical Properties & Chemical Composition
- Types of Duplex Steel S31803 Round Bars
- Key Advantages of UNS S31803 Round Bars
- Key Applications of Duplex Steel S31803 Round Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Duplex Steel S31803 Round Bar Overview
Aurum Overseas supplies certified dual-phase stainless steel round bars engineered to deliver high mechanical strength and chloride corrosion resistance. As a premier Duplex Steel S31803 Round Bar Supplier and Duplex Steel S31803 Round Bar Exporter, we stock premium inventory designed for marine environments, offshore oil production, and chemical processing systems.
-(f51)-round-bar.webp "Duplex Steel S31803 Round Bars")
We specialize in precision-engineered ASTM A276 Round Bars and ASTM A479 Round Bars manufactured to withstand localized pitting, crevice attack, and stress corrosion cracking. Our stock includes high-precision bright bars for machining alongside heavy Duplex Steel F51 Round Bars forged for structural load-bearing hardware.
We export these specialized dual-phase alloy bars across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
Technical Specifications
| Technical Parameter | Duplex Steel S31803 (F51) |
|---|---|
| Material Designation | Duplex 2205 / F51 / UNS S31803 |
| UNS Number | UNS S31803 |
| Manufacturing Standards | ASTM A276 Round Bars, ASTM A479 Round Bars, EN 10088-3, NACE MR0175 |
| Diameter Capability | 3 mm to 500 mm (1/8" to 20" NB) |
| Length Specifications | 3 Meters, 6 Meters, Cut-to-Length |
| Dimensional Tolerances | ISO h8, h9, h10, h11, DIN 1013 |
| Delivery Conditions | Solution Annealed & Water Quenched |
Mechanical Properties & Chemical Composition
Equivalent Grades of UNS S31803 Round Bars
| Alloy Grade | Werkstoff Nr. | UNS | EN Standard | Common Designation |
|---|---|---|---|---|
| Duplex S31803 | 1.4462 | S31803 | X2CrNiMoN22-5-3 | Duplex F51 / 2205 |
Chemical Composition of UNS S31803 Round Bars
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.030 |
| Manganese (Mn) | — | 2.00 |
| Silicon (Si) | — | 1.00 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.020 |
| Chromium (Cr) | 22.0 | 23.0 |
| Molybdenum (Mo) | 3.0 | 3.5 |
| Nickel (Ni) | 4.50 | 6.50 |
| Nitrogen (N) | 0.14 | 0.20 |
| Iron (Fe) | 63.72 min | Balance |
Mechanical Properties of UNS S31803 Round Bars
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 620 MPa (90,000 psi) min |
| Yield Strength (0.2% Offset) | 450 MPa (65,000 psi) min |
| Elongation (%) | 25% min |
| Density | 7.805 g/cm³ (0.285 lb/in³) |
| Melting Point | 1420°C – 1465°C (2588°F – 2669°F) |
Types of Duplex Steel S31803 Round Bars
Aurum Overseas supplies ASTM A276 and ASTM A479 Duplex Steel S31803 Round Bars in precision bright and heavy forged conditions for offshore and chemical service.
Duplex Steel F51 Bright Bars
Duplex Steel F51 Forged Bars
Key Advantages of UNS S31803 Round Bars
Double the Strength
Provides nearly twice the yield strength of standard austenitic stainless steels, allowing engineers to design lighter and thinner parts.
Resists Chloride Pitting
High chromium, molybdenum, and nitrogen levels protect the metal against severe pitting and hole formation in saltwater and chemical fluids.
Stops Stress Corrosion Cracking
The balanced 50/50 ferrite-austenite microstructure stops stress corrosion cracking in warm, chloride-rich environments.
Excellent Erosion Resistance
Tough metal surface stands up to abrasive fluids and high-velocity slurry flow in pumps and valves.
Cost-Effective Design
High strength combined with moderate nickel content reduces overall material weight and total project costs.
Key Applications of Duplex Steel S31803 Round Bars
| Industry Sector | Typical Components | Operating Conditions |
|---|---|---|
| Oil & Gas Offshore | Downhole tools, valve stems, and riser clamps | High pressure, sour gas (H2S), and seawater exposure |
| Marine Engineering | Propeller shafts, rudder stocks, and boat fasteners | Continuous saltwater immersion and cyclic mechanical fatigue |
| Chemical Processing | Heat exchanger bars, agitators, and pressure vessel bolts | Nitric, organic, and chloride-laden chemical solutions |
| Desalination Plants | High-pressure pump shafts and rotor components | High-velocity brine flow and aggressive chloride attack |
| Pulp & Paper Processing | Digester shafts, bleach washer rolls, and liquor pumps | Corrosive bleaching agents and elevated operating temperatures |
Quality Testing & Inspection
Every lot of UNS S31803 Round Bars supplied by Aurum Overseas undergoes complete quality verification:
- Positive Material Identification (PMI): Non-destructive XRF analysis verifies exact ratios of chromium, molybdenum, nickel, and nitrogen.
- Microstructure Phase Count: Metallographic examination ensures a balanced 50/50 ferrite-austenite phase distribution per ASTM E562.
- Ultrasonic Testing (UT): Internal sound testing on forged bars per ASTM A388 rules out internal voids or inclusions.
- Mechanical & Pitting Resistance Testing: Mechanical testing confirms yield and tensile strength, while ASTM G48 testing verifies pitting resistance.
Global Export Markets
As an established Duplex Steel S31803 Round Bar Exporter, Aurum Overseas supplies fully certified UNS S31803 Round Bars to global energy and marine engineering centers:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
S32205 is a dual-certified, higher-nitrogen cap on the S31803 specification, offering slightly higher corrosion resistance and yield strength.
ASTM A276 covers hot-rolled and cold-finished bars for structural applications, while ASTM A479 covers bars for pressure vessels and boilers.
Yes, due to its 50% ferritic phase structure, Duplex S31803 exhibits magnetic properties, unlike standard 300-series austenitic stainless steels.
Duplex F51 should be welded with matched duplex fillers (e.g., 2209) while controlling heat input to preserve the 50/50 phase balance.
Contact Aurum Overseas
Aurum Overseas delivers certified Duplex Steel S31803 Round Bars engineered for demanding industrial projects.
Contact our technical sales team for pricing, stock lists, or immediate quotes: