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.