Duplex Steel Alloy 329 Industrial Valves Overview
Zeon Exports supplies Duplex Steel Alloy 329 (UNS S32900) industrial valves — ball, gate, globe and check types — one of the earliest duplex stainless grades, with a chloride-resistant, high-strength composition for pulp & paper and marine process lines.
Duplex Steel Alloy 329 Industrial Valves control and isolate flow in pulp & paper, chemical processing and marine process lines. 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 Industrial Valves
Duplex Steel Alloy 329 Industrial Valves are produced to internationally recognized specifications; the exact ASTM forging/casting designation should be confirmed on order.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 329 |
| UNS | S32900 |
| Werkstoff Number | 1.4460 |
| Standards | Confirm exact ASTM forging/casting standard on order |
| Form | Ball, Gate, Globe, Check Valves |
| 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 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 Industrial Valves
Minimum mechanical properties for annealed UNS S32900; confirm against the applicable valve component 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 Industrial Valves 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 seat faces and stem packing in chloride environments.
- Chloride SCC resistance: resists stress corrosion cracking that limits austenitic 304/316 valves in hot chloride service.
Heat Resistance of Duplex Steel Alloy 329
Duplex Steel Alloy 329 valves 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 Industrial Valves
Beyond corrosion and heat performance, Alloy 329 valves 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 Industrial Valves
Choosing Alloy 329 valves 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 valve types and end connections to match 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
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Request a Quote for Duplex Steel Alloy 329 Industrial Valves
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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 Industrial Valves
Common questions about Duplex Steel Alloy 329 Industrial Valves, 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 valve types are available in Alloy 329?
Ans. We supply ball, gate, globe and check valves with Alloy 329 bodies and trim.
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 equipment 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 valve sizes?
Ans. Yes, valves are available in custom sizes and end connections on request for bulk industrial orders.
Q8: What standards apply to Alloy 329 valves?
Ans. Valves are manufactured per applicable ASTM forging and casting standards, certified to EN 10204 3.1 mill test certificates.
