Duplex Steel Alloy 329 Fittings Overview
Zeon Exports supplies Duplex Steel Alloy 329 (UNS S32900) fittings — elbows, tees, reducers, caps and stub ends — one of the earliest duplex stainless grades, with a chloride-resistant, high-strength composition for pulp & paper and marine piping.
Duplex Steel Alloy 329 Fittings connect and direct piping runs 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 Fittings
Duplex Steel Alloy 329 Fittings are produced to internationally recognized specifications; the exact ASTM fitting designation should be confirmed on order.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 329 |
| UNS | S32900 |
| Werkstoff Number | 1.4460 |
| Standards | Confirm exact ASTM fitting standard on order |
| Form | Elbows, Tees, Reducers, Caps, Stub Ends |
| Finish | Pickled & Passivated |
| 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 |
|---|---|---|---|
| S32900 | 1.4460 | X3CrNiMoN27-5-2 | Type 329 |
Chemical Composition of Alloy 329
Composition 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 |
| 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 Fittings
Minimum mechanical properties for annealed UNS S32900; confirm against the applicable fittings standard for your order.
| Property | Value |
|---|---|
| Tensile Strength | 620 – 880 MPa |
| Yield Strength (0.2% offset), min | 450 MPa |
| Condition | Solution Annealed |
Corrosion Resistance of Duplex Steel Alloy 329
- Duplex Steel Alloy 329 Fittings 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 welded and flanged fitting joints in chloride environments.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic 304/316 fittings in hot chloride service.
Heat Resistance of Duplex Steel Alloy 329
Duplex Steel Alloy 329 fittings 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 Fittings
Beyond corrosion and heat performance, Alloy 329 fittings 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 Fittings
Choosing Alloy 329 fittings 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
- Multiple sizes 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
Related Products
Explore related Duplex Steel products from Zeon Exports.
Request a Quote for Duplex Steel Alloy 329 Fittings
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Call: +91 98205 33105
Email: info@zeonexports.com
Website: www.zeonexports.com
Address: A-7/9, Saboo Building, Ardeshir Dady Cross Lane, Cawasji Patel Tank Road, Mumbai – 400004
Frequently Asked Questions About Duplex Steel Alloy 329 Fittings
Common questions about Duplex Steel Alloy 329 Fittings, 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: Which fitting types are available in Alloy 329?
Ans. We supply elbows, tees, reducers, caps and stub ends across standard sizes.
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: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q7: Does Zeon Exports supply custom sizes?
Ans. Yes, fittings are available cut-to-size and in custom dimensions on request for bulk industrial orders.
Q8: What standards apply to Alloy 329 fittings?
Ans. Fittings are manufactured per applicable ASTM piping fitting standards, certified to EN 10204 3.1 mill test certificates.
