Table of Contents
SMO 254 / 6MO Threaded Bars Overview
Aurum Overseas is a trusted SMO 254 Threaded Bars Supplier & Exporter, stocking high-performance 6 Moly super austenitic stainless steel fasteners made to ASTM A276 standards. Designed as a cost-effective alternative to nickel alloys, these studs offer double the strength of standard stainless steels and extreme pitting protection.
-threaded-bar.webp "SMO 254 Threaded Bars")
Our inventory includes certified ASTM A276 UNS S31254 Threaded Bars containing 6.0–6.5% Molybdenum and high Nitrogen. This chemistry gives 254 SMO Alloy Threaded Rods a PREN above 42, providing total resistance to chloride pitting, crevice corrosion, and stress corrosion cracking.
Built for seawater desalination plants, pulp bleach washers, offshore platforms, and chemical scrubbers, our 6MO Threaded Bars deliver leak-tight joints. Contact Aurum Overseas for factory quotes, custom length cutting, and fast global delivery.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM A276, ASTM A479, ASME SA276, EN 10204 3.1 |
| UNS Designation | UNS S31254 (SMO 254 / 6 Moly) |
| Thread Size Range | M6 to M100 (1/4" to 4.0" Nominal Diameter) |
| Thread Profiles | UNC, UNF, UNEF, Metric Coarse, Metric Fine, Acme Threads |
| Length Options | 1,000 mm, 2,000 mm, 3,000 mm, Custom Cut-to-Length All-Thread Studs |
| Thread Class / Fit | Class 2A / 3A (Imperial) & 6g / 6h (Metric Profile Tolerances) |
| HSN Code | 73181500 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | W.Nr. | UNS | EN Standard |
|---|---|---|---|---|
| SMO 254 / 6MO | ASTM A276 | 1.4547 | S31254 | X1CrNiMoCuN20-18-7 |
Chemical Composition (%)
| Chemical Element | SMO 254 (UNS S31254) |
|---|---|
| Chromium (Cr) | 19.50 – 20.50 |
| Nickel (Ni) | 17.50 – 18.50 |
| Molybdenum (Mo) | 6.00 – 6.50 |
| Nitrogen (N) | 0.18 – 0.22 |
| Manganese (Mn) | 1.00 max |
| Carbon (C) | 0.020 max |
| Phosphorus (P) | 0.030 max |
Mechanical & Physical Properties
| Property Parameter | SMO 254 (UNS S31254) |
|---|---|
| Tensile Strength (Min) | 650 MPa |
| Yield Strength (0.2% Proof Stress, Min) | 300 MPa (43.5 ksi) |
| Elongation (Min) | 35 % |
| Hardness (Max) | 270 HBW |
| Reduction of Cross Section Area (Min) | 50 % |
Key Advantages of SMO 254 Threaded Rods
Extreme Chloride Pitting Defense (PREN > 42)
6.0–6.5% Molybdenum content prevents deep microscopic pitting and crevice corrosion in hot seawater and acidic halide solutions.
Double Yield Strength vs 316L
Delivers 300 MPa (43.5 ksi) minimum yield strength, enabling engineers to design lighter, thinner flanged joints under high pressure.
Pulp & Scrubber Acid Resilience
Resists aggressive oxidizing environments like chlorine dioxide bleach stages and flue gas desulfurization (FGD) scrubbers.
High Nitrogen Strain Resistance
0.18–0.22% Nitrogen alloying strengthens the austenitic crystal structure against thermal shock and fatigue in marine operations.
Quality Testing & Inspection
Aurum Overseas subjects every batch to strict Quality Assurance protocols to ensure compliance with international super austenitic fastener standards:
- Positive Material Identification (PMI): Spectro / XRF chemical analysis verifying 6% Molybdenum content per ASTM A276 specifications.
- Dimensional & Thread Pitch Inspection: Go/No-Go gage testing and optical comparator checks ensuring exact 2A/3A and 6g thread fit tolerances.
- Mechanical Batch Testing: Proof stress, tensile strength, and elongation verification backed by EN 10204 3.1 Material Test Reports.
- Optional Specialized Testing: Pitting corrosion testing (ASTM G48 Method A), intergranular corrosion testing, or proof load testing upon request.
Global Export Markets
As an established SMO 254 Threaded Bars Exporter, Aurum Overseas supplies fully certified ASTM A276 UNS S31254 threaded rods to global desalination, marine, pulp & paper, offshore, and chemical processing facilities:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
It is called 6 Moly because it contains 6.0% to 6.5% Molybdenum, which significantly increases resistance to chloride pitting compared to standard stainless steels.
SMO 254 offers nearly double the yield strength of 316L and a much higher PREN value (42), making it far more resistant to aggressive marine and acidic environments.
They are commonly used in seawater desalination plants, marine scrubbers, pulp and paper bleach plants, offshore platforms, and chemical processing equipment handling halides.
Yes. As an SMO 254 Threaded Bars Exporter, we supply orders across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.
Yes. We supply ASTM A276 UNS S31254 Threaded Bars to customers across the USA, Canada, Germany, the UK, and Europe.
Contact Aurum Overseas
Contact Aurum Overseas, a premier SMO 254 Threaded Bars Supplier & Exporter, for certified ASTM A276 6MO studs, cut-to-length threaded rods, and fast global shipping.