Super Duplex Steel Fasteners

Need a dependable super duplex fastener? Super Duplex Steel Fasteners on MetalMitra come in standard and custom dimensions to ASTM A182, ready for bolted joints that stay tight.

Super Duplex Steel Fasteners are mechanical joining components such as bolts, nuts, studs, screws and washers used to assemble flanges, structures, machinery and equipment.

Super duplex stainless steel combines a balanced austenitic-ferritic microstructure with high chromium, molybdenum and nitrogen content, giving very high strength and excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking.

Available forms & variants

• Bolts — Hex, heavy hex, stud, U, J, T, eye and foundation bolts.
• Nuts — Hex, heavy hex, lock, wing, dome and nylock nuts.
• Studs & Threaded Rods — Fully and partially threaded studs and rods.
• Screws & Washers — Machine screws, socket screws, plain and spring washers.

Performance highlights

• High Strength — Roughly twice the yield strength of standard austenitic stainless steels.
• Chloride Resistance — Excellent resistance to pitting and crevice corrosion in seawater and brine.
• Stress Corrosion Resistance — Strong resistance to chloride stress corrosion cracking.
• Weight Saving — Higher strength allows lighter designs in suitable applications.

Typical applications

• Offshore Oil & Gas
• Seawater Systems
• Desalination Plants
• Chemical Processing
• Petrochemical
• Pulp & Paper
• Marine Engineering
• Heat Exchangers
• Pollution Control
• Subsea Equipment
• Fabrication
• General Engineering

Quality checks & certification

Every lot of Super Duplex Steel Fasteners sourced through MetalMitra can be inspected and documented to the governing standard and your purchase order.

• Dimensional & thread inspection
• Visual inspection
• Grade verification against the order
• Chemical composition verification
• Mechanical / proof load testing as applicable
• Hardness testing as applicable
• EN 10204 3.1 Mill Test Certificate
• Project-specific documentation on request

Chemical & mechanical properties

Chemical composition and mechanical properties are supplied to the limits of the governing material standard. Actual heat values are reported on the mill test certificate shared with each consignment.

Why buy through MetalMitra

• Checked sellers only — Every supplier profile is screened by MetalMitra before it goes live.
• Faster sourcing — Post one requirement and receive competitive offers without chasing calls.
• Paperwork sorted — MTC 3.1, test reports and TPI arranged as your project demands.
• Global logistics — Seaworthy packing and dispatch to project sites across the world.

Ready to buy?

Send your size, grade, quantity and delivery location for Super Duplex Steel Fasteners, and matching suppliers on MetalMitra will come back with offers.

Technical note: Figures shown are indicative. Final acceptance should be based on the applicable standard, approved drawings and the MTC supplied with the material.