Super Duplex UNS S32760 Bolts for High-Pressure Valves

The Super Duplex UNS S32760 bolts supplied by EFS represent a proven technical solution for high-pressure valves. They are ideal for offshore industry where mechanical reliability and corrosion resistance are essential requirements. In the Oil & Gas and energy sectors, the selection of Super Duplex bolts for high-pressure valves has a direct impact on operational safety and plant uptime.

Super Duplex UNS S32760: an alloy for critical applications

Super Duplex UNS S32760 is a high-alloy stainless steel featuring an optimised austenitic–ferritic micro-structure, specifically designed for severe operating environments. Compared to standard Duplex grades, it offers:

• very high mechanical strength, ideal for heavy static and dynamic loads;
• excellent resistance to localised corrosion (pitting and crevice corrosion), particularly in chloride-rich environments;
• good stability in marine and chemically aggressive conditions.

For these reasons, Super Duplex bolting for valves is widely used in offshore platforms, pumping systems, heat exchangers and equipment handling corrosive fluids.

Super Duplex bolts for high-pressure valves: EFS supply

The supply consists of DIN 931 bolts in Super Duplex UNS S32760, with diameters ranging from M8 to M20 and various lengths, complete with nuts and washers compliant with applicable standards. These Super Duplex bolts are intended for valves operating under high pressure and continuous duty cycles.

In applications of this kind, selecting a high-performance material alone is not enough. Ensuring dimensional control, production repeatability and fully documented quality throughout the entire supply chain is essential.

Laser marking and traceability of Super Duplex fasteners

The bolts are identified by laser marking, a technology particularly suitable for Super Duplex Oil & Gas fasteners, as it provides permanent identification without altering the component geometry. Markings remain legible even after long service periods.

Each batch is supplied with a UNI EN 10204 3.1 inspection certificate, confirming the chemical and mechanical properties of the material. The raw material is of European origin Full traceability is therefore a key requirement for Super Duplex UNS S32760 bolts used in valves and other critical components in the energy sector.

Duplex vs Super Duplex: technical comparison

In summary, Duplex is suitable for demanding but non-extreme operating conditions. Super Duplex, on the other hand, is preferred when pressure levels, fluid chemistry and service life require a higher safety margin.

Fastener reliability for high-pressure valves

In high-pressure valves, the quality of Super Duplex bolts is not limited to the material grade alone, but involves the entire process:

• alloy selection
• controlled machining
• appropriate marking
• certification and technical documentation.

It is this integrated approach that enables EFS to reliably support complex projects in the Oil & Gas and energy sectors

Discover the full range of EFS special fasteners.