Duplex Steel Alloy 2205 Fasteners Overview
Duplex Steel Alloy 2205 Fasteners secure flanged and bolted connections in piping and structural systems exposed to chlorides, seawater and process chemicals. Their balanced duplex structure gives higher strength and better galling resistance than standard austenitic bolting, reducing the risk of loosening or seizing under repeated thermal cycling in offshore and marine bolted joints.
Quick Specifications of Duplex Steel Alloy 2205 Fasteners
Duplex Steel Alloy 2205 Fasteners are produced to internationally recognized bolting specifications.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 2205 |
| UNS | S31803 / S32205 |
| Werkstoff Number | 1.4462 |
| Standards | ASTM A276, ASTM A479, ASME SA193/SA194 |
| Form | Bolts, Nuts, Studs, Washers |
| Finish | Passivated |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 2205
Alloy 2205 fasteners correspond to equivalent duplex designations across standards bodies and regional naming systems.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S31803 | 1.4462 | X2CrNiMoN22-5-3 | Duplex 2205 | ASTM A276/A479 |
| S32205 | 1.4462 | X2CrNiMoN22-5-3 | Duplex 2205 (restricted) | ASTM A276/A479 |
Chemical Composition of Alloy 2205
Chemical composition follows ASTM A276/A479 limits for UNS S31803/S32205; exact ranges can vary 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 fasteners share the physical properties of duplex 2205 base material, summarized below.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 |
| Melting Range | ~1420–1460°C |
| Magnetic Behaviour | Magnetic |
Mechanical Properties of Duplex Steel Alloy 2205 Fasteners
Mechanical properties below reflect standard solution-annealed condition minimums for Alloy 2205 fasteners.
| 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 Fasteners resist localized attack far better than A2/A4 stainless.
- Pitting resistance: high resistance to chloride-induced pitting in seawater and brine service.
- Crevice resistance: performs reliably under bolt heads, nuts and flange faces where crevice corrosion typically starts.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic bolting in hot chloride environments, extending service life in bolted marine joints.
Heat Resistance of Duplex Steel Alloy 2205
Alloy 2205 fasteners 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. 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 verified against a fastener-specific spec – confirm against the applicable design code before publishing.
Key Properties of Duplex Steel Alloy 2205 Fasteners
Beyond corrosion and heat performance, Alloy 2205 fasteners offer these additional properties.
- High mechanical strength allows smaller bolt sizes for equivalent load
- Good galling resistance versus standard austenitic stainless bolting
- Machinable with standard tooling at moderate cutting speeds
- Good impact toughness down to low sub-zero temperatures
Benefits of Duplex Steel Alloy 2205 Fasteners
Choosing Alloy 2205 fasteners 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 sizes, threads and finishes 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 Fasteners
Common questions about Duplex Steel Alloy 2205 Fasteners, 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 fastener types are available in Alloy 2205?
Ans. We supply bolts, nuts, studs and washers to ASTM A276/A479 across standard thread sizes and lengths.
Q3: What standards do Alloy 2205 fasteners meet?
Ans. Fasteners are manufactured to ASTM A276/A479, certified to EN 10204 3.1 mill test certificates.
Q4: How does Alloy 2205 compare to A2/A4 stainless bolts?
Ans. Alloy 2205 offers roughly double the yield strength and significantly better pitting and crevice resistance than A2/A4.
Q5: What is the PREN value of Alloy 2205 fasteners?
Ans. Alloy 2205 has a PREN of approximately 34–38, indicating strong resistance to pitting and crevice corrosion.
Q6: Can Alloy 2205 fasteners be used offshore?
Ans. Yes, Alloy 2205 fasteners are widely used in offshore, marine and seawater bolted joints 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, fasteners are available in custom thread sizes and lengths on request for bulk industrial orders.
