Duplex Steel Alloy 2205 Fittings Overview
Zeon Exports supplies Duplex Steel Alloy 2205 (UNS S31803/S32205) fittings – elbows, tees, reducers, caps and stub ends – for oil & gas, petrochemical, marine and chemical plants. Made to ASTM/ASME standards with full material traceability, these fittings pair duplex strength with strong chloride resistance, backed by fast turnaround and export-ready documentation.
Duplex Steel Alloy 2205 Fittings connect and direct piping runs in systems handling chlorides, seawater and process chemicals, where austenitic fittings corrode faster. The dual ferritic-austenitic structure gives these fittings higher strength and pitting resistance than 304/316L. Engineers specify them for offshore, desalination and chemical processing lines needing long service life with thinner-walled fittings.
- PREN 34–38 for strong chloride and pitting resistance
- Nearly double the yield strength of 316L fittings
- MTC 3.1 certified, export-ready worldwide
Quick Specifications of Duplex Steel Alloy 2205 Fittings
Duplex Steel Alloy 2205 Fittings are produced to internationally recognized specifications, with the following quick reference specs.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 2205 |
| UNS | S31803 / S32205 |
| Werkstoff Number | 1.4462 |
| Standards | ASTM A182, ASTM A815, ASME B16.9 |
| Form | Elbows, Tees, Reducers, Caps, Stub Ends |
| Finish | Pickled & Passivated |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 2205
Alloy 2205 fittings correspond to equivalent duplex designations used across standards bodies and regional naming systems, summarized below.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S31803 | 1.4462 | X2CrNiMoN22-5-3 | Duplex 2205 | ASTM A182/A815 |
| S32205 | 1.4462 | X2CrNiMoN22-5-3 | Duplex 2205 (restricted) | ASTM A182/A815 |
Chemical Composition of Alloy 2205
Chemical composition follows ASTM A182/A815 limits for UNS S31803/S32205; exact ranges can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.14 – 0.20 |
| Manganese, Silicon, Iron | Balance |
Physical Properties of Duplex Steel Alloy 2205
Alloy 2205 fittings share the physical properties of duplex 2205 base material, summarized below for reference.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 |
| Melting Range | ~1420–1460°C |
| Magnetic Behaviour | Magnetic |
Mechanical Properties of Duplex Steel Alloy 2205 Fittings
Mechanical properties below reflect standard solution-annealed condition minimums for Alloy 2205 fittings.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 620 MPa |
| Yield Strength | 450 MPa |
| Elongation | 25% |
| Condition | Solution Annealed |
Corrosion Resistance of Duplex Steel Alloy 2205
- With a PREN of 34–38, Duplex Steel Alloy 2205 Fittings resist localized attack far better than 316L.
- Pitting resistance: high resistance to chloride-induced pitting in seawater and brine service.
- Crevice resistance: performs reliably in flanged and threaded joints where crevice corrosion typically starts.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic fittings in hot chloride environments, extending service life in marine and offshore piping.
Heat Resistance of Duplex Steel Alloy 2205
Alloy 2205 fittings are generally suited to continuous service across a moderate temperature range typical of duplex grades; industry guidance commonly limits continuous use to roughly 300°C to avoid embrittlement risk, and to low sub-zero temperatures per the applicable design code. Always confirm exact service limits against the governing standard and application before specifying.
⚠️ Flag: the 300°C figure is a general duplex-family guideline, not a value verified against a specific spec for this exact fitting range – confirm against the applicable design code before publishing.
Key Properties of Duplex Steel Alloy 2205 Fittings
Beyond corrosion and heat performance, Alloy 2205 fittings offer these additional properties.
- High mechanical strength allows thinner-walled fitting designs
- Good weldability using ER2209/E2209 filler metals
- Machinable with standard tooling at moderate cutting speeds
- Good impact toughness down to low sub-zero temperatures
Benefits of Duplex Steel Alloy 2205 Fittings
Choosing Alloy 2205 fittings from Zeon Exports delivers measurable advantages for your project.
- Lower long-term maintenance from superior corrosion resistance
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple finishes and sizes to match exact project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
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Frequently Asked Questions About Duplex Steel Alloy 2205 Fittings
Common questions about Duplex Steel Alloy 2205 Fittings, answered below.
Q1: What is Duplex Steel Alloy 2205?
Ans. Alloy 2205 (UNS S31803/S32205) is a duplex stainless steel with balanced ferritic-austenitic structure, giving high strength and strong chloride pitting resistance.
Q2: Which fitting types are available in Alloy 2205?
Ans. We supply elbows, tees, reducers, caps, stub ends and buttweld fittings to ASTM A182/A815 across standard size ranges.
Q3: What standards do Alloy 2205 fittings meet?
Ans. Fittings are manufactured to ASTM A182/A815 and ASME B16.9, certified to EN 10204 3.1 mill test certificates.
Q4: How does Alloy 2205 compare to 316L fittings?
Ans. Alloy 2205 offers roughly double the yield strength and significantly better pitting and crevice resistance than 316L.
Q5: What is the PREN value of Alloy 2205 fittings?
Ans. Alloy 2205 has a PREN of approximately 34–38, indicating strong resistance to pitting and crevice corrosion.
Q6: Can Alloy 2205 fittings be used offshore?
Ans. Yes, Alloy 2205 fittings are widely used in offshore, marine and seawater piping systems for their chloride resistance.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom sizes?
Ans. Yes, fittings are available cut-to-size and in custom dimensions on request for bulk industrial orders.
