At a desalination plant by the Arabian Sea, maintenance crews struggled with rapid pitting and chloride attack in their pump shafts and heat exchangers until they switched to SMO 254 Round Bars. This robust super austenitic grade didn’t just survive the brine; it extended uptime, cut replacements, and became the go-to choice from offshore rigs to high-purity pharma plants. Today, Aurico Alloys LLP SMO 254 Round Bars are the secret behind the reliability of countless marine, oil & gas, power, and chemical assets around the world.
Table of Contents:
SMO 254 (UNS S31254, 1.4547, F44) is a 6% molybdenum super austenitic stainless rich in nickel (18–18.5%) and chromium (19.5–20.5%), with nitrogen for extra pitting and crevice resistance. This chemistry brings it close to titanium and nickel alloys, yet with cost and machinability similar to high-end stainless. It thrives in seawater, desalination, sour oil/gas, chemical production, pharmaceuticals, and pulp and paper bleach lines.
With a minimum yield of 300 MPa and tensile over 650–680 MPa, plus 35–50% elongation, SMO 254 bars withstand high pressure, vibration, and repeated thermal cycling. Their resistance to stress corrosion cracking, excellent fabricability, and workability in field conditions gives engineers, OEMs, and fabricators a material trusted for everything from tankage and heat exchangers to electrodes, pump shafts, and even precision battery connector hardware.
Aurico Alloys LLP provides SMO 254 round bars per ASTM A276, A479, EN 10272, with sizes from 3mm to 500mm+, in rough, turned, ground, bright, or polish finishes. Each bar ships with RoHS/REACH compliance, full MTCs, batch traceability, rapid export, and custom cutting for urgent repairs or project supply backed by specialists who know global marine, energy, and process industry standards.
High-quality SMO 254 Round Bars ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | SMO 254 (UNS S31254, 1.4547, F44) |
| Standards | ASTM A276, A479, EN 10272, DIN 1.4547 |
| Diameter Range | 3mm – 500mm+ |
| Length | 1–6 meters, custom cut |
| Finishes | Bright, polished, rough turned, centerless ground, black |
| Delivery | Direct stock, cut/machined custom, urgent supply & full docs |
| Price | INR 1,500 – 2,500 per kg. Indicative USD 18 – 29 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | S31254 |
| Werkstoff / EN number | 1.4547 |
| EN designation | X1CrNiMoCuN20-18-7 |
| Density | 8.00 g/cm3 |
| Modulus of elasticity | 195 GPa |
| Coefficient of expansion | 16.5 µm/m·°C |
| Thermal conductivity | 14 W/m·°C |
| Specific heat | 500 J/kg·°C |
| Electrical resistivity | 0.85 µΩ·m |
| Magnetic | no |
| Rod and bar specification | ASTM A479 |
Identifiers and physical constants for 254 SMO. A dash means no such designation is published for this grade.
Stock & Product Availability
SMO 254 round bars are warehoused in all diameters (3–500mm+), ready-to-cut, and delivered with MTCs for marine, chemical, power gen, and OEM repair or fabrication.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.020 |
| Silicon (Si) | — | 0.80 |
| Manganese (Mn) | — | 1.00 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.010 |
| Chromium (Cr) | 19.5 | 20.5 |
| Molybdenum (Mo) | 6.0 | 6.5 |
| Nickel (Ni) | 17.5 | 18.5 |
| Copper (Cu) | 0.50 | 1.00 |
| Nitrogen (N) | 0.18 | 0.25 |
| Iron (Fe) | — | Balance |
Composition limits for 254 SMO. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 650–680 |
| Yield Strength (MPa) | 300 |
| Elongation (%) | 35–50 |
| Hardness (HB) | 210 |
| Modulus of Elasticity (GPa) | 195 |
| Max Service Temp (°C) | 600 |
Applications & Benefits
- Marine: seawater, desalination, ship pumps, heat exchangers, hull hardware
- Chemical/Oil & Gas: brine, acid processing, high-pressure pipes/tankage, FGD scrubbers
- Power: superheaters, condenser hardware, turbines
- Pharma: reactors, purity loops, process equipment
- Fabricators/OEMs: rapid-field repair, custom machine stock, hardware stores
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Aurico Alloys LLP SMO 254 Round Bars empower the most demanding marine, chemical, energy, pharma, and OEM projects bringing proven reliability, certified integrity, and cost-effective long life where other stainless steels wear out. Are your critical assets protected with the world’s most reliable 6Mo super austenitic?