Super Duplex Fasteners

Super Duplex Fasteners Grades

AISI 4130 Bolts

Introduction to Super Duplex Fasteners

Super duplex fasteners are superior to duplex and regular stainless steel grades in terms of corrosion resistant and mechanical strength. Super duplex fasteners are available in varied forms of bolts, screws, stud bolts, threaded rods, nuts, washers & custome fastening components, manufactured in grades like 2507, ferralium alloy 255, zeron 100 and uns equivalent S32550, S32750 & S32760. Super duplex 2507 fasteners offer resistance to chloride corrosion with high tensile strength. Corrosion resistance of super duplex fasteners can be measured in terms of PREN, which is minimum of 40 for super duplex grades.

Super duplex steel is an improved version of duplex stainless steel. With addition of more molybdenum and nickel content, Super Duplex is superior to duplex stainless steel. It shows excellent crevice and pitting resistance. Super Duplex 2507 is the most common alloy used for super duplex fasteners. It is high-alloy steel with a PRE value of min. 42. Super Duplex 2507 has a very good chloride corrosion resistance, combined with very high mechanical strength, characterizes the grade. Super Duplex Steel is particularly suited for use in aggressive environments such as warm chlorinated seawater and acidic, chloride containing medium.

Super Duplex Fasteners

  • Super Duplex Steel Bolts
    Bolts
  • Super Duplex Steel Screws
    Screws
  • Super Duplex Steel Stud Bolts
    Stud Bolts
  • Super Duplex Steel Threaded Rods
    Threaded Rods
  • Super Duplex Steel Nuts
    Nuts
  • Super Duplex Steel Washers
    Washers
  • Super Duplex Steel Accessories
    Accessories
  • Super Duplex Steel Components
    Components

Standard Specifications for Super Duplex Fasteners

Super Duplex Stainless Steel Fasteners are manufactured from forging, bar stock, plates or bolting specifications as listed under.

Specifications Grade Products
ASTM A182    
ASTM A276    
ASTM A479    
ASTM A1082    

Applications for Super Duplex Fasteners

Super Duplex stainless steel fasteners are used in bolting pipeline flanges, process equipments, components and other instruments operating in following sectors.

Sea Water Desalination Plants Marine Engineering Power Plants
Chemical Plants Shipbuilding Paper & Pulp Processing Units