🧪 Material: Super Duplex Fasteners – Extreme Strength Meets Corrosion Resistance
Overview:
Super Duplex Stainless Steel is a highly advanced alloy designed to deliver outstanding mechanical strength, stress corrosion cracking resistance, and superior performance in aggressive environments. Containing a balanced microstructure of austenite and ferrite, Super Duplex offers nearly double the strength of conventional austenitic stainless steels like 316 or even standard duplex grades.
At SM Fasteners, we manufacture and supply premium Super Duplex Fasteners that meet global standards such as ASTM, UNS, and EN/DIN, ensuring long-lasting performance in critical and corrosive conditions.
Why Choose Super Duplex Fasteners?
✅ High yield strength – up to twice that of 300 series stainless steel
✅ Outstanding resistance to pitting, crevice, and chloride stress corrosion
✅ Excellent weldability and mechanical toughness
✅ Superior performance in seawater, brine, and acidic environments
✅ Lower lifecycle cost due to long-term durability
Super Duplex Grades We Offer
UNS S32750 (F53)
UNS S32760 (F55)
Equivalent to DIN 1.4410, ASTM A479, A182, and EN 10088
Chemical Composition (UNS S32750)
Element | % Composition |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum(Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.35 |
| Manganese (Mn) | ≤ 1.2 |
| Silicon (Si) | ≤ 0.8 |
| Carbon (C) | ≤ 0.03 |
| Iron (Fe) | Balance |
Mechanical Properties (UNS S32750)
Property | Value |
|---|---|
| Tensile Strength | ≥ 800 MPa |
| Yield Strength (0.2%) | ≥ 550 MPa |
| Elongation | ≥ 25% |
| Hardness (Brinell) | ≤ 290 HB |
| Impact Strength | Excellent (> 100J at -50°C) |
| Operating Temp Range | -50°C to 300°C |
Applications of Super Duplex Fasteners
Used where chloride corrosion and high mechanical stress are concerns:
Oil & Gas Industry – Subsea equipment, pressure vessels
Desalination Plants – Pump housings, intake screens
Chemical Process Industry – Acidic chemical reactors and storage
Power Generation – Flue gas desulfurization, turbines
Marine Hardware – Dock systems, shipbuilding
Pulp & Paper Industry – Bleaching systems, digesters
Types of Super Duplex Fasteners We Manufacture
Hex Bolts & Heavy Hex Nuts
Socket Screws & Allen Bolts
Threaded Rods / Stud Bolts
U-Bolts, L-Bolts, Eye Bolts
Washers and Flange Fasteners
Custom Fabricated Fasteners as per Drawing
Packaging & Delivery
Our packaging ensures rust-free and damage-free global delivery:
Vacuum-sealed or VCI bags
Foam-lined boxes and labeled polybags
Export-standard wooden crates
Material Grade, Size, and Heat Number labeled on every packet
Documentation Supplied
Every Super Duplex fastener comes with:
Mill Test Certificate (EN 10204 3.1 or 3.2)
Third-Party Inspection Report (as requested)
Chemical & Mechanical Test Reports
Heat Treatment Reports
Raw Material Traceability Certificate
NACE MR0175 / ISO / ASTM compliance (on request)
Request a Quotation
Get durable, corrosion-resistant Super Duplex fasteners from SM Fasteners today!
📧 Email: susheel@smfastners.com
📞 Phone: +91 8968469570
💬 WhatsApp: Chat Now
🏆 SM Fasteners – India’s Trusted Manufacturer for Super Duplex Fasteners
With decades of experience and state-of-the-art manufacturing, we deliver premium quality Super Duplex fasteners for demanding global clients. Our commitment to precision, compliance, and customer satisfaction sets us apart.