Exotic Alloys Alloy 254 Sheets Overview
Zeon Exports supplies Exotic Alloy 254 (254 SMO, UNS S31254) sheets and plates, a super austenitic 6% molybdenum stainless steel with a PREN of 42-44, developed for seawater and other aggressive chloride-bearing environments.
Exotic Alloy 254 (254 SMO) Sheets & Plates are fabricated into tanks, heat exchangers and vessels for seawater handling, desalination and offshore oil & gas equipment. Its 20% chromium, 18% nickel and 6% molybdenum composition with added nitrogen gives a PREN of 42-44, providing performance approaching nickel-based alloys while retaining the fabricability of stainless steel.
- PREN 42–44, roughly double the pitting resistance of 316L
- Tensile ≥650 MPa, yield ≥300 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Exotic Alloys Alloy 254 Sheets
Exotic Alloy 254 (254 SMO) Sheets & Plates are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 254 (254 SMO) |
| UNS | S31254 |
| DIN/Werkstoff Number | 1.4547 |
| Standards | ASTM A240 |
| Form | Sheet, Plate, Strip |
| Finish | Hot-rolled, Cold-rolled |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 254
Alloy 254 (254 SMO) is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|
| S31254 | 1.4547 | 254 SMO / 6Mo / F44 | ASTM A240 |
Chemical Composition of Alloy 254
Composition per ASTM A240 for UNS S31254; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Nitrogen (N) | 0.18 – 0.22 |
| Copper (Cu) | 0.50 – 1.00 |
| Iron (Fe) | Balance |
Physical Properties of Exotic Alloy 254 (254 SMO)
Typical physical properties for 254 SMO; confirm exact heat-specific figures against the mill test certificate.
| Property | Value |
|---|---|
| Density | ~8.0 g/cm3 (typical) |
| Melting Range | ~1320–1390°C (typical) |
| Magnetic Behaviour | Essentially non-magnetic |
Mechanical Properties of Exotic Alloys Alloy 254 Sheets
Minimum mechanical properties for annealed UNS S31254 per ASTM A240.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 650 MPa (95 ksi) |
| Yield Strength (0.2% offset) | 300 MPa (44 ksi) |
| Elongation | 35% |
| Condition | Solution Annealed |
Corrosion Resistance of Exotic Alloy 254 (254 SMO)
- Exotic Alloy 254 Sheets & Plates were developed specifically for seawater and other aggressive chloride environments.
- Pitting resistance: excellent resistance to chloride-induced pitting, roughly double that of 316L.
- Crevice resistance: high resistance to crevice corrosion in seawater, confirmed by ASTM G48 testing.
- Chloride SCC resistance: excellent resistance to chloride stress corrosion cracking, unlike standard austenitic grades.
Heat Resistance of Exotic Alloy 254 (254 SMO)
Exotic Alloy 254 sheets and plates have good mechanical properties at both ambient and moderately elevated temperatures, but are generally not selected for continuous service above roughly 300°C due to intermetallic phase formation risk. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Exotic Alloys Alloy 254 Sheets
Beyond corrosion and heat performance, 254 SMO sheets and plates offer these additional properties.
- Good weldability with matching filler metal
- Formability comparable to standard austenitic stainless steels
- High strength relative to standard 316L stainless steel
- Approaches nickel alloy performance at lower relative cost
Benefits of Exotic Alloys Alloy 254 Sheets
Choosing 254 SMO sheets and plates from Zeon Exports delivers measurable advantages for your project.
- Seawater-grade corrosion resistance at lower cost than nickel alloys
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple thicknesses 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
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Request a Quote for Exotic Alloys Alloy 254 Sheets
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Frequently Asked Questions About Exotic Alloys Alloy 254 Sheets
Common questions about Exotic Alloy 254 (254 SMO) Sheets & Plates, answered below.
Q1: What is Exotic Alloy 254 (254 SMO)?
Ans. 254 SMO (UNS S31254) is a super austenitic 6% molybdenum stainless steel developed for seawater and chloride resistance.
Q2: What standards apply to 254 SMO sheets and plates?
Ans. Sheets and plates are manufactured to ASTM A240, certified to EN 10204 3.1 mill test certificates.
Q3: What is the PREN value of 254 SMO?
Ans. 254 SMO has a PREN of 42-44, roughly double the pitting resistance of standard 316L stainless steel.
Q4: Is 254 SMO magnetic?
Ans. 254 SMO is essentially non-magnetic, being a super austenitic stainless steel.
Q5: Is 254 SMO suitable for seawater service?
Ans. Yes, it was developed specifically for seawater handling, desalination and offshore applications.
Q6: What thickness range is available?
Ans. Zeon Exports supplies standard and custom thickness ranges; confirm exact availability against your order quantity.
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, sheets and plates are available cut-to-size on request for bulk industrial orders.
