Exotic Alloys Alloy 254 Fittings Overview
Zeon Exports supplies Exotic Alloy 254 (254 SMO, UNS S31254) fittings – elbows, tees, reducers and stub ends – 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) Fittings connect piping runs in seawater, desalination and offshore oil & gas systems. 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 Fittings
Exotic Alloy 254 (254 SMO) Fittings are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 254 (254 SMO) |
| UNS | S31254 |
| DIN/Werkstoff Number | 1.4547 |
| Standards | ASTM A182 / A403 |
| Form | Elbows, Tees, Reducers, Stub Ends |
| Finish | Pickled & Passivated |
| 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 A182 / A403 |
Chemical Composition of Alloy 254
Composition per ASTM A182/A403 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 |
| 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 Fittings
Minimum mechanical properties for annealed UNS S31254.
| 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 Fittings 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.
Heat Resistance of Exotic Alloy 254 (254 SMO)
Exotic Alloy 254 fittings 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 Fittings
Beyond corrosion and heat performance, 254 SMO fittings 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 Fittings
Choosing 254 SMO fittings 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 fitting 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 Exotic Alloys Alloy 254 Fittings
Ready to source Exotic Alloy 254 (254 SMO) Fittings? Share your fitting type, size and quantity requirements and our team will respond with a quote.
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 Exotic Alloys Alloy 254 Fittings
Common questions about Exotic Alloy 254 (254 SMO) Fittings, 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: Which fitting types are available in 254 SMO?
Ans. We supply elbows, tees, reducers and stub ends across standard fitting sizes.
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 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 fitting sizes?
Ans. Yes, fittings are available in custom sizes and end connections on request for bulk industrial orders.
Q8: How does 254 SMO compare to duplex 2205 for fittings?
Ans. 254 SMO offers higher pitting resistance in seawater, while duplex 2205 offers higher strength at lower cost for general chloride service.
