Duplex Steel Alloy 2304 Flanges Overview
Zeon Exports supplies Duplex Steel Alloy 2304 (UNS S32304) flanges, a lean duplex stainless steel with 23% chromium and 4% nickel, giving corrosion resistance similar to 316L at nearly double the yield strength.
Duplex Steel Alloy 2304 Flanges join pipe runs and connect components in chemical processing, water treatment and general industrial piping. Their lean composition — high chromium, low nickel, essentially no molybdenum — keeps costs down while the duplex structure provides higher strength than 316L flanges.
- Molybdenum-free composition keeps costs lower than standard duplex 2205
- Tensile ≥600 MPa, yield ≥400 MPa — double that of 316L
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Duplex Steel Alloy 2304 Flanges
Duplex Steel Alloy 2304 Flanges are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Duplex Steel Alloy 2304 |
| UNS | S32304 |
| Werkstoff Number | 1.4362 |
| Standards | ASTM A182 / ASME SA182 |
| Form | Forged Flanges |
| Finish | Pickled & Annealed |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 2304
Alloy 2304 is recognized under several international designations below.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S32304 | 1.4362 | X2CrNiN23-4 | SAF 2304 / Alloy 2304 | ASTM A182 |
Chemical Composition of Alloy 2304
Composition per ASTM A182 for UNS S32304; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 21.5 – 24.5 |
| Nickel (Ni) | 3.0 – 5.5 |
| Molybdenum (Mo), max | 0.60 |
| Nitrogen (N) | 0.05 – 0.20 |
| Manganese (Mn), max | 2.50 |
| Carbon (C), max | 0.030 |
| Silicon (Si), max | 1.00 |
| Phosphorus (P), max | 0.040 |
| Sulphur (S), max | 0.030 |
| Iron (Fe) | Balance |
Physical Properties of Duplex Steel Alloy 2304
Physical properties for Alloy 2304, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 |
| Melting Range | Confirm against applicable datasheet |
| Magnetic Behaviour | Magnetic (ferrite phase present) |
Mechanical Properties of Duplex Steel Alloy 2304 Flanges
Minimum mechanical properties per ASTM A182 for UNS S32304.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 600 MPa |
| Yield Strength (0.2% offset) | 400 MPa |
| Elongation | 25% |
| Hardness | 290 HB max |
| Condition | Solution Annealed |
Corrosion Resistance of Duplex Steel Alloy 2304
- Duplex Steel Alloy 2304 Flanges offer corrosion resistance broadly comparable to 316L thanks to their high chromium content.
- Pitting resistance: PREN of roughly 24–26, moderately above 316L, suited to mild-to-moderate chloride exposure.
- Crevice resistance: good performance at flange faces and bolted joints in non-severe chloride environments.
- Chloride SCC resistance: its duplex structure resists stress corrosion cracking better than austenitic 304/316 grades.
Heat Resistance of Duplex Steel Alloy 2304
Duplex Steel Alloy 2304 flanges are generally suited to continuous service up to roughly 300°C, similar to other duplex grades, with industry guidance cautioning against extended high-temperature exposure to avoid embrittlement risk. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Duplex Steel Alloy 2304 Flanges
Beyond corrosion and heat performance, Alloy 2304 flanges offer these additional properties.
- Nearly double the yield strength of 304/316 austenitic stainless
- Good weldability using 2304 or 2209 matching filler metal
- Better stress corrosion resistance than 304/316 in chloride solutions
- Lower alloy cost than molybdenum-bearing duplex grades
Benefits of Duplex Steel Alloy 2304 Flanges
Choosing Alloy 2304 flanges from Zeon Exports delivers measurable advantages for your project.
- Cost-effective upgrade path from 316L with real strength gains
- Full MTC 3.1 documentation for project QA/QC requirements
- Wide range of flange types, sizes and pressure ratings
- 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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Email: info@zeonexports.com
Website: www.zeonexports.com
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Frequently Asked Questions About Duplex Steel Alloy 2304 Flanges
Common questions about Duplex Steel Alloy 2304 Flanges, answered below.
Q1: What is Duplex Steel Alloy 2304?
Ans. Alloy 2304 (UNS S32304) is a lean duplex stainless steel with 23% chromium, 4% nickel and essentially no molybdenum.
Q2: What standards apply to Alloy 2304 flanges?
Ans. Flanges are forged to ASTM A182 / ASME SA182, certified to EN 10204 3.1 mill test certificates.
Q3: How does Alloy 2304 compare to Alloy 2205?
Ans. Alloy 2304 has a lower PREN (~24–26 vs 34–38) and no molybdenum, making it a lower-cost alternative for less severe chloride service.
Q4: Is Alloy 2304 suitable for chloride service?
Ans. It suits mild-to-moderate chloride exposure similar to 316L; for more aggressive chloride environments, Alloy 2205 is recommended.
Q5: Is Alloy 2304 magnetic?
Ans. Yes, like other duplex grades, Alloy 2304 is magnetic due to its ferrite phase content.
Q6: Do you supply all flange types?
Ans. Yes, weld neck, slip-on, socket weld, blind, threaded and lap joint flanges are available in Alloy 2304.
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, flanges are available in custom sizes and pressure classes on request for bulk industrial orders.
