Exotic Alloys Alloy 254 Round Bar Overview
Zeon Exports supplies Exotic Alloy 254 (254 SMO, UNS S31254) round bars, 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) Round Bar is machined into pumps, valves, chokes and fasteners 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 Round Bar
Exotic Alloy 254 (254 SMO) Round Bar is produced to internationally recognized bar specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 254 (254 SMO) |
| UNS | S31254 |
| DIN/Werkstoff Number | 1.4547 |
| Standards | ASTM A479, ASTM A276 |
| Form | Round Bar |
| Finish | Hot rolled, turned, ground (as specified) |
| 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 A479 / A276 |
Chemical Composition of Alloy 254
Composition per ASTM A479/A276 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 |
| Carbon (C), max | 0.020 |
| Manganese (Mn), max | 1.00 |
| Silicon (Si), max | 0.80 |
| Phosphorus (P), max | 0.030 |
| Sulphur (S), max | 0.010 |
| 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 Round Bar
Minimum mechanical properties for annealed UNS S31254 per ASTM A479/A276.
| 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 Round Bar was 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 round bar retains excellent ductility and impact strength at both ambient and sub-zero temperatures; it is generally selected for moderate-temperature aqueous service rather than high-temperature structural applications. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Exotic Alloys Alloy 254 Round Bar
Beyond corrosion and heat performance, 254 SMO round bar offers these additional properties.
- Strength roughly twice that of standard 300-series stainless steel
- Excellent weldability without preheating required
- Low carbon content minimizes carbide precipitation risk
- Good ductility and impact strength at sub-zero temperatures
Benefits of Exotic Alloys Alloy 254 Round Bar
Choosing 254 SMO round bar from Zeon Exports delivers measurable advantages for your project.
- Nickel-alloy-level corrosion resistance at a lower cost
- 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
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Frequently Asked Questions About Exotic Alloys Alloy 254 Round Bar
Common questions about Exotic Alloy 254 (254 SMO) Round Bar, answered below.
Q1: What is Exotic Alloy 254 (254 SMO)?
Ans. 254 SMO (UNS S31254) is a super austenitic 6% molybdenum stainless steel with a PREN of 42-44.
Q2: What standards apply to 254 SMO round bar?
Ans. Round bar is manufactured to ASTM A479/A276, certified to EN 10204 3.1 mill test certificates.
Q3: Is 254 SMO magnetic?
Ans. 254 SMO is essentially non-magnetic, being a fully austenitic stainless steel.
Q4: How does 254 SMO compare to 904L?
Ans. 254 SMO has higher molybdenum and nitrogen, giving a PREN of 42-44 versus 904L's PREN of around 34, for superior chloride pitting resistance.
Q5: Is 254 SMO suitable for seawater service?
Ans. Yes, 254 SMO was specifically developed for seawater and other aggressive chloride-bearing environments.
Q6: Does 254 SMO require post-weld heat treatment?
Ans. No, if welded correctly without preheating, no subsequent heat treatment is generally required.
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, round bars are available cut-to-size and in custom dimensions on request for bulk industrial orders.
