Table of Contents
- SMO 254 / 6 Moly Alloy Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of ASTM A276 UNS S31254 Square Bars
- Key Advantages of SMO 254 / 6 Moly Square Bar
- Key Applications of SMO 254 / 6 Moly Square Bar
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SMO 254 / 6 Moly Alloy Overview
Aurum Overseas is a premier SMO 254 Square Bars Supplier and 6 Moly Alloy Square Bars Supplier providing high-performance austenitic stainless steel bars for severe chloride and marine environments. Alloyed with 6% molybdenum and nitrogen, our ASTM A276 UNS S31254 Square Bars offer double the yield strength of 300-series steels and superior pitting resistance.
As a trusted SMO 254 Square Bars Exporter and 6 Moly Alloy Square Bars Exporter, we supply precision 6 Moly Bright Square Bars for CNC machining and heavy-duty 6 Moly Forged Square Bars for structural applications. Every shipment includes EN 10204 3.1 mill test certificates, complete heat traceability, and custom cut-to-length options.
We supply certified 6 Moly square bar stock to offshore oil platforms, seawater desalination plants, FGD scrubbers, and pulp bleaching facilities across the USA, Germany, UK, UAE, Saudi Arabia, and global markets.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM A276, ASTM A479, ASME SA276, ASME SA479, EN 10088-3 |
| UNS Designation | UNS S31254 |
| Size Range (Square) | 6.0 mm x 6.0 mm to 200 mm x 200 mm (1/4" to 8" square profile) |
| Length Options | 1,000 mm to 6,000 mm, Custom Sawing Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged, Rough Turned |
| Condition | Solution Annealed (1150 °C to 1200 °C followed by rapid water quench) |
| Dimensional Tolerances | ASTM A484 / ISO 286-2 (h9, h10, h11 square profile tolerances) |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Standard | Werkstoff Nr. | UNS Designation | EN Symbol |
|---|---|---|---|
| ASTM A276 | 1.4547 | S31254 | X1CrNiMoCuN20-18-7 |
Chemical Composition (%)
| Element | Content Range (%) |
|---|---|
| Carbon (C) | 0.02 max |
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Copper (Cu) | 0.5 – 1.0 |
| Nitrogen (N) | 0.18 – 0.25 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 0.8 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.01 max |
| Iron (Fe) | Balance (Bal) |
Mechanical & Physical Properties
| Property Parameter | Metric Value | Imperial Value |
|---|---|---|
| Density | 8.0 g/cm³ | 0.289 lb/in³ |
| Melting Range | 1320 °C – 1390 °C | 2410 °F – 2535 °F |
| Tensile Strength (Min) | 650 MPa | 94,000 Psi |
| Yield Strength (0.2% Offset, Min) | 300 MPa | 43,500 Psi (35,000 Psi min per ASTM) |
| Elongation (Min) | 35 % | 35 % |
| Hardness (Brinell, Max) | 220 HBW | 220 HBW |
Types of ASTM A276 UNS S31254 Square Bars
Aurum Overseas supplies SMO 254 / 6 Moly Alloy square bars in precision bright and heavy forged conditions for severe chloride and marine environments.
SMO 254 / 6 Moly Bright Square Bars
SMO 254 / 6 Moly Forged Square Bars
Key Advantages of SMO 254 / 6 Moly Square Bar
Superior Seawater Resistance
Eliminates crevice corrosion and pitting under marine biofouling and stagnant saltwater conditions.
Elevated Mechanical Strength
Higher yield strength allows design engineers to reduce wall thickness and component mass without compromising structural integrity.
Resists Non-Oxidizing Acids
Copper alloying additions improve performance in sulfuric and dilute hydrochloric acid environments.
Excellent Weldability
Low carbon content (≤ 0.02) prevents chromium carbide precipitation during welding, maintaining corrosion resistance in welded joints.
Key Applications of SMO 254 / 6 Moly Square Bar
| Industry | Applications | Key Benefit |
|---|---|---|
| Desalination Plants | High-pressure pump shafts, valve stems, impeller shafting | Resists high-velocity concentrated brine and severe seawater pitting. |
| Offshore Oil & Gas | Hydraulic tubing manifolds, marine fasteners, structural supports | Eliminates crevice corrosion in splash zones and subsea saltwater environments. |
| Pulp & Paper Processing | Bleach plant washer vats, filter drums, roll shafts | Withstands aggressive acidic bleaching liquors and heavy oxidative process fluids. |
| Flue Gas Desulfurization (FGD) | Scrubber damper shafts, spray nozzles, support grids | Resists highly acidic slurry condensate containing elevated chloride concentrations. |
Quality Assurance & Inspection
As a leading SMO 254 Square Bars Exporter and 6 Moly Alloy Square Bars Exporter, every product undergoes comprehensive testing:
- Chemical Composition Verification: Spectro-analysis to verify exact Cr, Ni, Mo, and N chemistry.
- Pitting Corrosion Testing: ASTM G48 Method A testing to verify resistance to pitting corrosion in ferric chloride.
- Ultrasonic Inspection: Volumetric inspection per ASTM A388 on forged profiles to confirm internal structural integrity.
Global Export Markets
As an established SMO 254 / 6 Moly Alloy Square Bars Exporter, Aurum Overseas supplies fully certified ASTM A276 UNS S31254 Square Bars to global marine and chemical processing centers:
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
SMO 254 contains 6% molybdenum and added nitrogen, giving it a PREN ≥ 42 compared to 316L's PREN of ~25. This provides dramatically superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
Bright square bars are cold drawn or centerless ground for precise tolerances in automatic machining, whereas forged square bars offer refined grain structures ideal for heavy structural loads.
Yes, UNS S31254 exhibits excellent weldability. Matching filler metals such as ERNiCrMo-3 or Overall Alloy 625 are recommended to preserve corrosion resistance across the weld zone.
It excels in stagnant, high-velocity, and chlorinated seawater environments, preventing localized pitting where conventional stainless steels fail.
Contact Aurum Overseas
Contact a trusted SMO 254 Square Bars Supplier and 6 Moly Alloy Square Bars Supplier for certified stock, fast pricing, and global logistics options.