Material: SMO 254 (6Mo Alloy) – Extreme Strength, Ultimate Corrosion Resistance
Overview:
SMO 254, also known as UNS S31254, is a high-alloy austenitic stainless steel designed for extreme environments. With exceptionally high resistance to pitting, crevice corrosion, and stress corrosion cracking, SMO 254 fasteners are ideal for demanding applications in the chemical processing, marine, and offshore industries.
At SM Fasteners, we supply precision-engineered fasteners made from certified SMO 254 material — ensuring superior corrosion protection, mechanical durability, and reliable performance even in the most aggressive conditions.
Why Choose SMO 254 Fasteners?
With up to 6% molybdenum, SMO 254 delivers significantly better corrosion resistance than standard stainless steels and even duplex grades. It is specifically engineered for use in chloride-rich and acidic environments where other materials fail.
✅ Extremely High Pitting Resistance Equivalent Number (PREN > 42)
✅ Superior Resistance to Seawater, Acids, and Chlorides
✅ Excellent Mechanical Strength
✅ High Ductility and Toughness
✅ Non-Magnetic and Easily Weldable
✅ Long-Term Performance in Aggressive Environments
Chemical Composition of SMO 254 (UNS S31254)
| Element | % Content |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Nitrogen (N) | 0.18 – 0.22 |
| Iron (Fe) | Balance |
Applications of SMO 254 Fasteners
SMO 254 is the go-to material where chloride stress corrosion cracking, pitting, and crevice corrosion are serious concerns. Common uses include:
Desalination Plants & Seawater Systems
Pulp & Paper Bleaching Equipment
Flue Gas Cleaning Systems
Offshore Oil & Gas Platforms
Chemical Tankers and Marine Vessels
Heat Exchangers and Condensers
High-Chloride Food Processing Units
Mechanical Properties (Annealed Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% Offset) | ≥ 300 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 100 HBW |
| Density | 8.0 g/cm³ |
Product Forms in SMO 254
Hex Bolts (Full/Partial Threaded)
Heavy Hex Nuts & Lock Nuts
Stud Bolts & Threaded Rods
Washers (Flat/Spring/Custom)
Custom Machined Parts as per Drawing
Packaging & Delivery
To preserve integrity and traceability, SMO 254 fasteners are:
Packed in moisture-proof VCI polybags and strong export-grade boxes
Individually labelled with heat number, grade, and dimensions
Shipped with complete traceability and certificate documents
Available for pan-India delivery and global exports
Certifications & Documentation Provided
Mill Test Certificate (EN 10204 3.1 / 3.2)
PMI (Positive Material Identification) Reports
Ultrasonic & Hardness Testing (on request)
IGC & Corrosion Testing Reports
Material Traceability with Heat No.
Country of Origin & RoHS Compliance
Request a Quotation or Technical Consultation
Need corrosion-resistant fasteners that last in the harshest environments? Reach out to our team.
📧 susheel@smfastners.com
📱 +91 8968469570
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🔩 SM Fasteners – Delivering Excellence in High-Performance Alloys