Alloy 2205 Flanges Overview
Zeon Exports supplies Alloy 2205 Duplex Steel Flanges (UNS S32205/S31803) engineered for high strength and superior chloride corrosion resistance in demanding piping systems. Manufactured to ASTM/ASME standards and backed by mill test certification, our flanges serve oil & gas, marine, chemical processing, and desalination projects worldwide, with reliable export logistics from Mumbai, India.
Alloy 2205 Flanges are precision-manufactured duplex stainless steel flanges combining austenitic and ferritic microstructures in roughly equal proportion, giving them notably higher strength than conventional austenitic grades.
Engineers specify Alloy 2205 Flanges wherever piping connections face chloride-rich, corrosive, or high-pressure service, since the grade resists stress corrosion cracking far better than 304/316 stainless while remaining fully weldable.
- Nearly double the strength of standard 316 stainless steel flanges
- Excellent resistance to chloride pitting and crevice corrosion
- Available in Weld Neck, Slip-On, Blind, Socket Weld & more
Quick Specifications of Alloy 2205 Flanges
Alloy 2205 Flanges are supplied to the following standard reference specifications, with full documentation provided at the time of order.
| Field | Detail |
|---|---|
| Material/Grade | Alloy 2205 Duplex Stainless Steel |
| UNS | S32205 / S31803 |
| Werkstoff Number | 1.4462 |
| Standards | ASTM A182, ASME B16.5 |
| Form | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint |
| Finish | As specified (confirm on order) |
| Heat Treatment | Solution annealed |
| Certification | EN 10204 3.1 MTC |
Equivalent Grades of Alloy 2205
The table below lists internationally recognized designations equivalent to Alloy 2205, useful when cross-referencing specifications across regions and standards bodies.
| UNS | Werkstoff No. | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S32205 / S31803 | 1.4462 | X2CrNiMoN22-5-3 | Alloy 2205 / Duplex 2205 | ASTM A182 Grade F51 |
Chemical Composition of Alloy 2205
Chemical composition of Alloy 2205 Flanges is controlled per ASTM A182 / A240; exact limits can vary slightly by product form and specification – confirm against the applicable standard.
| Element | Range |
|---|---|
| Chromium (Cr) | 21 – 23% |
| Nickel (Ni) | 4.5 – 6.5% |
| Molybdenum (Mo) | 2.5 – 3.5% |
| Nitrogen (N) | 0.14 – 0.20% |
| Manganese, Silicon | Confirm exact limits on request |
| Iron (Fe) | Balance |
Physical Properties of Alloy 2205 Duplex Steel
Physical properties below reflect typical published values for Alloy 2205 duplex stainless steel; heat-specific figures should be confirmed against the mill test certificate.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 (typical; confirm on request) |
| Melting Range | Confirm against applicable standard |
| Magnetic Behaviour | Mildly magnetic (ferrite phase present) |
| Thermal Conductivity | Available on request |
Mechanical Properties of Alloy 2205 Flanges
Minimum mechanical properties for Alloy 2205 Flanges in the solution-annealed condition, per ASTM A182 Grade F51.
| Property | Minimum |
|---|---|
| Tensile Strength | 620 MPa (90 ksi) |
| Yield Strength | 450 MPa (65 ksi) |
| Elongation | 25% |
| Condition | Solution Annealed |
Corrosion Resistance of Alloy 2205 Duplex Steel
- Alloy 2205 offers a Pitting Resistance Equivalent Number (PREN) of roughly 35, well above standard 316 stainless steel.
- Pitting Resistance: Chromium, molybdenum, and nitrogen content jointly resist localized pitting attack in chloride-bearing media.
- Crevice Resistance: The duplex microstructure resists crevice corrosion under gaskets, bolted joints, and stagnant flow zones.
- Chloride Resistance: Suited to seawater, brackish water, and other chloride-rich process streams where 316 stainless would degrade prematurely.
Heat Resistance of Alloy 2205 Duplex Steel
Alloy 2205 Flanges are generally suited to continuous service across a moderate temperature range typical of duplex stainless steels, with mechanical properties and corrosion resistance both tapering outside that band. Confirm exact upper and lower service-temperature limits against the applicable design code and application, since embrittlement risk and reduced toughness can occur outside the recommended range.
Key Properties of Alloy 2205 Flanges
Beyond corrosion and heat resistance, Alloy 2205 Flanges offer these additional performance advantages:
- High mechanical strength allows thinner, lighter flange sections for equivalent duty
- Good weldability using standard duplex welding procedures and consumables
- Reasonable machinability despite the higher strength duplex structure
- Good fatigue and impact toughness across a wide operating range
Benefits of Alloy 2205 Flanges
Choosing Alloy 2205 Flanges from Zeon Exports brings practical advantages beyond the metallurgy itself:
- Reduced maintenance and replacement cycles thanks to superior corrosion resistance
- Full mill test certification (EN 10204 3.1) and traceability on every batch
- Flexible finishes and size ranges cut to project-specific requirements
- Reliable ready stock and export-ready packaging for fast global delivery
- Single-source supply across flanges, fittings, fasteners, and bar in the same grade
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Frequently Asked Questions About Alloy 2205 Flanges
What is Alloy 2205 duplex steel? Alloy 2205 (UNS S32205/S31803) is a duplex stainless steel with roughly equal austenite and ferrite phases, offering high strength and corrosion resistance.
Q1: About Alloy 2205 Flanges
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