Precision-Engineered Super Duplex Socket Capscrews

Super Duplex Information, Composition & Properties

Super Duplex stainless steels are high-performance alloys designed to provide an exceptional combination of high mechanical strength and superior corrosion resistance. Their unique properties are derived from a balanced dual-phase microstructure, consisting of approximately equal proportions of austenite and ferrite. This hybrid structure allows Super Duplex socket capscrews to outperform standard austenitic or ferritic stainless steels, offering the toughness and ductility required for high-torque fastening alongside the rigidity needed to maintain structural integrity under extreme loads.

Composition:
The exceptional performance of Super Duplex is a result of its precise chemical composition. These alloys typically feature high levels of chromium (24-28%), molybdenum (3-5%), and nitrogen (0.2-0.35%). These specific elements are the primary drivers behind the material’s enhanced resistance to localised corrosion. Additionally, nickel content (4-7%) and trace amounts of other elements are included to stabilise the microstructure and ensure consistent performance across a wide temperature range.

Properties:

• Excellent Corrosion Resistance: The high chromium, molybdenum, and nitrogen content provides outstanding protection against pitting, crevice corrosion, and stress corrosion cracking, particularly in aggressive chloride-rich environments
• Exceptional Strength: Super Duplex alloys exhibit significantly higher tensile and yield strength than conventional stainless steels, making them ideal for the high-pressure demands placed on socket capscrews.
• High Fatigue Resistance: The material’s refined grain structure contributes to excellent fatigue strength, which is vital for fasteners subjected to cyclic loading or vibration.
• Durability in Harsh Media: These fasteners maintain their integrity when exposed to seawater, acidic solutions, and various industrial chemicals, ensuring long-term reliability.

Why Super Duplex is good for Socket Capscrews:

The combination of high-torque capability and extreme environmental resistance makes Super Duplex the ideal material for socket capscrews used in critical applications. These fasteners are specifically engineered for:

• Subsea and Offshore Equipment: Withstanding hydrostatic pressure and saltwater corrosion.
• Chemical and Petrochemical Processing: Resisting degradation from corrosive process fluids and high temperatures.
• Marine Engineering: Providing long-lasting structural security for vessels and coastal infrastructure.
• High-Pressure Valve and Pump Assemblies: Ensuring leak-proof connections in demanding flow-control systems.By selecting Super Duplex socket capscrews, engineers can ensure maximum safety and minimise maintenance costs in the world’s most challenging operational environments.”

At West Special Fasteners, we take pride in every Super Duplex Socket Capscrew we produce, no matter the application.

99% on-time delivery

At West Special Fasteners, we deliver precision-engineered fasteners with a proven 99% on-time delivery record, ensuring your projects stay on schedule. With lead times as short as 4 weeks for full-service orders, we provide unmatched reliability for industries where timing is critical.

• Minimise delays – Receive your special fasteners exactly when needed, helping you avoid costly project interruptions.
• Support critical operations – Our dependable delivery is essential for sectors like defence, offshore, and renewables, where timing is non-negotiable.
• Boost project efficiency – Reliable deliveries streamline your workflow, allowing you to focus on execution without supply chain concerns.
• Maintain your reputation – Trust in our punctuality to ensure your commitments to your clients are met, every time.
• Transparent communication – Realistic timelines and proactive updates at every stage.
• Efficient production – Our advanced facilities and streamlined processes enable us to deliver on time, even for complex and bespoke projects.

Our ability to always deliver on time sets us apart in the fastener industry. While with many competitors you can face frequent delays, we ensure your orders are delivered with precision and professionalism – backed by our fully traceable production process and industry-leading expertise.