What are super duplex fasteners?
These fasteners contain higher amounts of chromium, molybdenum, nitrogen and tungsten, giving them excellent corrosion resistance properties. Hence Super Duplex Fasteners are suited to deepwater offshore oil production.
What is a super duplex bolt?
Super duplex bolts are fasteners whose shank consists of threads emerging from below their head. They have higher mechanical strength and better creep resistance even at higher temperatures.
Do super duplex stainless steel fasteners corrode?
Unlike traditional stainless steel alloys, they are highly alloyed. Thus these fasteners have a higher PREN value (pitting resistance equivalent number) i.e. – 38 – 45. They are better at resisting corrosion compared to duplex alloys and work well in stronger acid and base environments.
All super duplex bolting material as per ASTM A479/ A276 specification. Choose from trusted suppliers who are specialized in super duplex steel chemical anchor bolts, raisin anchor bolts, marine anchor bolts, and countersunk bolts in Middle East countries.
Super Duplex Fasteners types
Super Duplex Hex Bolts
Super Duplex Steel J-bolts
Super Duplex Stainless Steel U-bolts
SDSS Friction Grip Bolts
Super Duplex Alloy Foundation Bolts
Super Duplex Grade Eye Bolts
Super Duplex Tie Bolts
Super Duplex Steel T Bolts
Super Duplex Stainless Steel Square Bolts
SDSS Anchor Bolts
Super Duplex Alloy Chemical Anchor Bolts
Super Duplex Grade Raisin Anchor Bolts
Super Duplex Marine Anchor Bolts
Super Duplex Steel Countersunk Bolts
Super Duplex Stainless Steel Hex Nut
SDSS Nut
Super Duplex Alloy Heavy Hex Nut
Super Duplex Grade Lock Nut
Super Duplex Nylone Nut
Super Duplex Steel Plain Washer
Super Duplex Stainless Steel Spring Washer
SDSS Star Washer
Super Duplex Alloy Machined Washer
Super duplex nuts and bolts and disadvantages
The fact that super duplex grades are highly alloyed and their mechanical and corrosion resistance properties of these alloys is ranges from excellent to good. They have one drawback. There may be a development of intermetallic phases or a drastic reduction of impact resistance if they are improperly processed.
Application of super duplex washers
Components made from super duplex alloys were specifically designed to cater for the demands of the oil and gas industry. The deposition of hydrogen or sulfur on traditional stainless steel pipes would cause them to break down by stress-related corrosion cracking. Since the PREN of super duplex fasteners is higher, they deliver excellent performance in the oil and gas sector.
Super duplex carriage Bolt vs U Bolt
A carriage Bolt is similar in appearance to a U Bolt. However, they are shorter in length and are used to fasten two materials together without a nut. These are preferred in assemblies that require very small and/or unobtrusive fastening. A super duplex U Bolt, on the other hand, is used in structural assemblies. They have higher tensile strength and can form both temporary & permanent attachments.
Other Grades
