Duplex Steel Alloy 329 Flanges Overview
Duplex Steel Alloy 329 Flanges connect and seal piping in systems handling chlorides, sulfuric and other acidic process streams, where austenitic-bodied flanges corrode faster. As one of the original duplex grades, its higher chromium content gives strong general and pitting corrosion resistance, historically used in pulp & paper, chemical processing and marine piping systems.
Quick Specifications of Duplex Steel Alloy 329 Flanges
Duplex Steel Alloy 329 Flanges are produced to internationally recognized specifications; confirm exact figures against the mill test certificate for your order.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 329 |
| UNS | S32900 |
| Werkstoff Number | *Confirm on request* |
| Standards | ASTM A182 |
| Form | Weld Neck, Slip-On, Blind |
| Finish | As specified (confirm on order) |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 329
Alloy 329 is recognized under UNS S32900; equivalent EN and trade designations should be confirmed against the applicable standard before publishing.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S32900 | *Confirm on request* | *Confirm on request* | Type 329 | ASTM A182 |
Chemical Composition of Alloy 329
Alloy 329 is a higher-chromium, lower-molybdenum duplex grade relative to 2205. Exact composition limits vary by specification and should be confirmed against ASTM A182 before publishing rather than stated here as fixed figures.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | *Confirm exact range against ASTM A182* |
| Nickel (Ni) | *Confirm exact range against ASTM A182* |
| Molybdenum (Mo) | *Confirm exact range against ASTM A182* |
| Iron (Fe) | Balance |
Physical Properties of Duplex Steel Alloy 329
Alloy 329's physical properties reflect its duplex structure; heat-specific figures should be confirmed against the mill test certificate.
| Property | Value |
|---|---|
| Density | *Confirm on request* |
| Melting Range | *Confirm on request* |
| Magnetic Behaviour | Magnetic (ferrite phase present) |
Mechanical Properties of Duplex Steel Alloy 329 Flanges
Mechanical properties for Alloy 329 Flanges should be confirmed against ASTM A182 for the specific size and condition ordered rather than stated here as fixed minimums.
| Property | Minimum Value |
|---|---|
| Tensile Strength | *Confirm against ASTM A182* |
| Yield Strength | *Confirm against ASTM A182* |
| Elongation | *Confirm against ASTM A182* |
| Condition | Solution Annealed |
Corrosion Resistance of Duplex Steel Alloy 329
- Duplex Steel Alloy 329 Flanges carry a comparatively high chromium content among duplex grades, giving strong resistance to localized attack.
- Pitting resistance: high resistance to chloride-induced pitting in acidic and brine service.
- Crevice resistance: performs reliably at bolted flange faces where crevice corrosion typically starts.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic flanges in hot chloride environments.
- ⚠️ Flag: exact PREN value not stated here – confirm against verified composition before publishing.
Heat Resistance of Duplex Steel Alloy 329
Alloy 329 flanges are generally suited to continuous service across a moderate temperature range typical of early 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.
Key Properties of Duplex Steel Alloy 329 Flanges
Beyond corrosion and heat performance, Alloy 329 flanges offer these additional properties.
- Higher strength than standard austenitic stainless flanges
- Good resistance to sulfuric and other acidic media
- Reasonable machinability despite the higher-strength duplex structure
- Long field history in pulp & paper and chemical processing
Benefits of Duplex Steel Alloy 329 Flanges
Choosing Alloy 329 flanges 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 flange types 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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Request a Quote for Duplex Steel Alloy 329 Flanges
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Email: info@zeonexports.com
Website: www.zeonexports.com
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Frequently Asked Questions About Duplex Steel Alloy 329 Flanges
Common questions about Duplex Steel Alloy 329 Flanges, answered below.
Q1: What is Duplex Steel Alloy 329?
Ans. Alloy 329 (UNS S32900) is one of the earliest duplex stainless steels, with a higher chromium content than 2205 for strong acid and chloride resistance.
Q2: Which flange types are available in Alloy 329?
Ans. We supply Weld Neck, Slip-On, Blind and other flange types in Alloy 329, manufactured to ASTM A182.
Q3: What standards do Alloy 329 flanges meet?
Ans. Flanges are manufactured to ASTM A182, certified to EN 10204 3.1 mill test certificates.
Q4: How does Alloy 329 compare to Alloy 2205?
Ans. Alloy 329 carries more chromium and less molybdenum than 2205, giving strong acid resistance; confirm exact PREN for your specific application.
Q5: Is Alloy 329 magnetic?
Ans. Yes, like other duplex grades, Alloy 329 is magnetic due to its ferrite phase content.
Q6: Can Alloy 329 flanges be used in chemical processing?
Ans. Yes, Alloy 329 has a long history of use in pulp & paper and chemical processing piping systems for its acid 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 flange sizes?
Ans. Yes, flanges are available in custom sizes and pressure classes on request for bulk industrial orders.
