Duplex Steel Alloy 329 Pipes & Tubes Overview
Zeon Exports supplies Duplex Steel Alloy 329 (UNS S32900) pipes and tubes, one of the earliest duplex stainless grades, with a chloride-resistant, high-strength composition for pulp & paper, chemical processing and marine piping.
Duplex Steel Alloy 329 Pipes & Tubes carry process fluids in pulp & paper, chemical processing and marine piping systems. As one of the original duplex grades, its chromium-nickel-molybdenum composition gives strong general and pitting corrosion resistance along with high strength and toughness, without requiring post-weld heat treatment.
- Yield ≥450 MPa, roughly double that of austenitic 304/316
- Excellent resistance to pitting, crevice and stress corrosion cracking
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Duplex Steel Alloy 329 Pipes & Tubes
Duplex Steel Alloy 329 Pipes & Tubes are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 329 |
| UNS | S32900 |
| Werkstoff Number | 1.4460 |
| Standards | ASTM A789 (Tube), ASTM A790 (Pipe) |
| Form | Seamless & Welded Pipe/Tube |
| Finish | Pickled & Annealed |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 329
Alloy 329 is recognized under several international designations below.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S32900 | 1.4460 | X3CrNiMoN27-5-2 | Type 329 | ASTM A789/A790 |
Chemical Composition of Alloy 329
Composition per ASTM A789/A790 for UNS S32900; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 23.0 – 28.0 |
| Nickel (Ni) | 2.50 – 5.00 |
| Molybdenum (Mo) | 1.00 – 2.00 |
| Manganese (Mn), max | 1.00 |
| Silicon (Si), max | 0.75 |
| Carbon (C), max | 0.08 |
| Phosphorus (P), max | 0.040 |
| Sulphur (S), max | 0.030 |
| Iron (Fe) | Balance |
Physical Properties of Duplex Steel Alloy 329
Physical properties for Alloy 329, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 (typical) |
| Melting Range | Confirm against applicable datasheet |
| Magnetic Behaviour | Magnetic (ferrite phase present) |
Mechanical Properties of Duplex Steel Alloy 329 Pipes & Tubes
Minimum mechanical properties for annealed UNS S32900 per ASTM A789/A790.
| Property | Value |
|---|---|
| Tensile Strength | 620 – 880 MPa |
| Yield Strength (0.2% offset), min | 450 MPa |
| Elongation | Confirm against ASTM A789/A790 for specific size |
| Condition | Solution Annealed |
Corrosion Resistance of Duplex Steel Alloy 329
- Duplex Steel Alloy 329 Pipes & Tubes carry very good resistance to localized corrosion in chloride-bearing environments.
- Pitting resistance: high resistance to chloride-induced pitting in acidic and alkaline solutions.
- Crevice resistance: performs well at flanged and threaded pipe joints in chloride environments.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic 304/316 pipe in hot chloride service.
Heat Resistance of Duplex Steel Alloy 329
Duplex Steel Alloy 329 pipes and tubes exhibit brittleness when exposed to temperatures between roughly 300°C and 900°C, and the ASME Boiler and Pressure Vessel Code restricts continuous use to below 260°C (500°F) to avoid embrittlement risk. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Duplex Steel Alloy 329 Pipes & Tubes
Beyond corrosion and heat performance, Alloy 329 pipes and tubes offer these additional properties.
- Good machinability from optimized sulfur content and inclusion morphology
- No post-weld heat treatment typically required
- High strength and toughness compared to austenitic grades
- Long field history in pulp & paper and marine applications
Benefits of Duplex Steel Alloy 329 Pipes & Tubes
Choosing Alloy 329 pipes and tubes from Zeon Exports delivers measurable advantages for your project.
- Proven, well-documented duplex grade with a long service record
- Full MTC 3.1 documentation for project QA/QC requirements
- Flexible sizing, schedules and finishes cut to project requirements
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
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Request a Quote for Duplex Steel Alloy 329 Pipes & Tubes
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Frequently Asked Questions About Duplex Steel Alloy 329 Pipes & Tubes
Common questions about Duplex Steel Alloy 329 Pipes & Tubes, answered below.
Q1: What is Duplex Steel Alloy 329?
Ans. Alloy 329 (UNS S32900) is one of the earliest duplex stainless steels, with a chromium-nickel-molybdenum composition.
Q2: What standards apply to Alloy 329 pipes?
Ans. Pipes are manufactured to ASTM A789/A790, certified to EN 10204 3.1 mill test certificates.
Q3: What is the maximum service temperature?
Ans. The ASME B&PV Code restricts continuous use of S32900 to below 260°C (500°F) to avoid embrittlement risk.
Q4: Is Alloy 329 magnetic?
Ans. Yes, like other duplex grades, Alloy 329 is magnetic due to its ferrite phase content.
Q5: Is Alloy 329 suitable for chemical processing?
Ans. Yes, Alloy 329 has a long history of use in pulp & paper and chemical processing piping for its acid resistance.
Q6: Do you supply seamless and welded pipe?
Ans. Yes, both seamless and welded Alloy 329 pipes are available, per project requirements.
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, pipes and tubes are available in custom sizes and schedules on request for bulk industrial orders.
