Table of Contents
- SMO 254 Round Bars Overview
- Technical Specifications
- Mechanical Properties & Chemical Composition
- Types of SMO 254 Round Bars
- Key Advantages of UNS S31254 Round Bars
- Key Applications of SMO 254 Round Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SMO 254 Round Bars Supplier & Exporter
Aurum Overseas is a leading SMO 254 Round Bars Supplier offering ready-to-ship UNS S31254 Round Bars. Fortified with 6% molybdenum and nitrogen, our 6MO Stainless Steel Round Bars prevent pitting and corrosion failures in harsh marine and chemical operations—reducing downtime and extending service life.
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As a trusted SMO 254 Round Bars Exporter, we maintain ready inventory of certified ASTM A276 UNS S31254 Round Bars complete with EN 10204 3.1 Mill Test Certificates. Our inventory includes precision ground ASTM A276 UNS S31254 Bright Bars, heavy-section ASTM A276 UNS S31254 Forged Bars, and custom cut-to-length solutions.
We export high-grade 6MO round bar stock globally with rapid dispatch to key industrial hubs across North America, Europe, the Middle East, and Asia-Pacific, including the USA, Germany, UAE, Saudi Arabia, Singapore, and Australia.
Technical Specifications
| Technical Parameter | SMO 254 / 6MO |
|---|---|
| Material Designation | SMO 254 / 6MO / 254 SMO / F44 |
| UNS Number | UNS S31254 |
| Manufacturing Standards | ASTM A276, ASTM A479, EN 10088-3, NORSOK M-630 (M-650) |
| Diameter Capability | 3 mm to 500 mm (1/8" to 20" NB) |
| Length Specifications | 3 Meters, 6 Meters, Cut-to-Length |
| Dimensional Tolerances | ISO h8, h9, h10, h11, DIN 1013 |
| Delivery Conditions | Solution Annealed (1150°C to 1200°C) & Rapidly Quenched |
Mechanical Properties & Chemical Composition
Equivalent Grades of SMO 254 Bars
| Standard | Werkstoff Nr. | UNS | EN |
|---|---|---|---|
| SMO 254 | 1.4547 | S31254 | X1CrNiMoCuN20-18-7 |
Chemical Composition of Stainless Steel S31254 Bars
| Chemical Element | Composition Range (%) |
|---|---|
| Chromium (Cr) | 19.50 – 20.50 |
| Nickel (Ni) | 17.50 – 18.50 |
| Molybdenum (Mo) | 6.00 – 6.50 |
| Copper (Cu) | 0.50 – 1.00 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.08 max |
| Carbon (C) | 0.02 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.01 max |
Mechanical Properties of UNS S31254 6MO Round Bars
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 650 MPa min |
| Yield Strength (0.2% Offset) | 300 MPa min |
| Elongation (%) | 35% min |
| Density | 8.0 g/cm³ |
| Melting Point | 1320 °C – 1390 °C |
Types of SMO 254 Round Bars
Aurum Overseas supplies ASTM A276 UNS S31254 Round Bars in precision bright and heavy forged conditions for marine and chemical service.
ASTM A276 UNS S31254 Bright Bars
ASTM A276 UNS S31254 Forged Bars
Key Advantages of UNS S31254 Round Bars
High Pitting Resistance (PREN ≥ 42)
Packed with 6% molybdenum to completely stop pitting and crevice corrosion in heavy saltwater and marine environments.
Zero Chloride Cracking
High nickel and nitrogen content prevents stress corrosion cracking in hot brackish water and aggressive chemical streams.
Double the Strength of 316L
Delivers a 300 MPa minimum yield strength—nearly double standard 300-series stainless steels—for higher load capacity.
Acid Processing Defense
Added copper boosts resistance against severe non-oxidizing acids like dilute sulfuric and phosphoric acid solutions.
Key Applications of SMO 254 Round Bars
| Industry Sector | Typical Components | Operating Conditions |
|---|---|---|
| Desalination & Marine | Pump shafts, piping manifolds, and valve stems | High-salinity brine streams, fast-flowing seawater, and marine exposure |
| Flue Gas Scrubbing | Scrubber drive shafts, spray nozzles, and agitator rods | Highly acidic wastewater, hot chloride vapors, and corrosive exhaust gases |
| Pulp & Paper Processing | Bleach plant washer shafts, drums, and doctor blades | Severe chemical bleaching liquids, acidic processing fluids, and wet chlorine gas |
| Offshore Oil & Gas | Subsea hydraulic lines, manifold bolts, and riser hardware | Deepwater ocean pressure, sour gas (H₂S), and offshore splash zones |
| Chemical Processing | Agitators, heat exchanger parts, and reactor vessels | Strong chemical solutions, organic acids, and high operating temperatures |
Quality Testing & Inspection
Every shipment of UNS S31254 Round Bars supplied by Aurum Overseas undergoes strict quality testing:
- Positive Material Identification (PMI): High-precision XRF testing confirms exact alloying percentages of molybdenum (6.0–6.5%), nickel (17.5–18.5%), and chromium (19.5–20.5%).
- Pitting Corrosion Resistance Testing: ASTM G48 Method A testing verifies crevice and pitting corrosion resistance in ferric chloride environments.
- Mechanical Strength Verification: Confirms yield strength (300 MPa min), tensile strength (650 MPa min), and 35% minimum elongation per ASTM A276 standards.
- Ultrasonic Volumetric Testing: Full internal scanning per ASTM A388 detects subsurface voids, micro-cracks, or forging discontinuities.
Global Export Markets
As an established SMO 254 Round Bars Exporter, Aurum Overseas supplies fully certified UNS S31254 Round Bars to global energy and marine engineering centers:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
"6MO" refers to the nominal 6% molybdenum content in the alloy (6.0–6.5% Mo), which gives the material its high resistance to pitting and crevice corrosion in chloride-rich environments.
SMO 254 contains three times the molybdenum content of 316L (6% Mo vs 2% Mo), higher nickel and chromium, and added nitrogen. This provides significantly higher yield strength and localized pitting resistance (PREN ≥ 42 vs PREN ~ 25).
Yes. UNS S31254 was engineered for seawater, brackish water, and high-chloride marine environments where standard austenitic grades suffer from pitting or stress cracking.
We maintain stock ranging from 3 mm to 500 mm in diameter across cold-drawn bright finishes and hot-forged conditions, available in 3-meter, 6-meter, or custom cut lengths.
Yes. Every order is supplied with full EN 10204 3.1 Mill Test Certificates covering heat chemistry, mechanical properties, and heat treatment compliance.
Contact Aurum Overseas
Aurum Overseas provides fully certified SMO 254 / 6MO Round Bars tailored to critical industrial specifications.
Contact our sales engineering team for stock availability, custom cut lengths, or immediate price quotes: