F55 containing 25% chromium, 7% nickel, 3.6% molybdenum as well as copper, tungsten and nitrogen, it is a high-pren, high-alloy super duplex stainless steel suitable for corrosive environments. It is a super biphase steel with a ferritic-austenitic microstructure. The alloy is composed of approximately 40-50% ferrite in the annealed state. The super biphase microstructure has the high strength of ferritic steel grades while retaining the corrosion resistance of austenitic steel grades, making it suitable for a variety of applications in industries such as oil and gas, CPI (chemical processing industry) and Marine environments.

• Excellent corrosion resistance in a wide variety of corrosive chemicals
• Pitting Resistance Equivalent number (PREN) of >40
• Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments
• Critical Pitting Temperature exceeding 50°C
• High strength compared to austenitic and 22%Cr duplex stainless steels
• Excellent ductility and impact strength at both ambient and sub-zero temperatures
• High resistance to abrasion, erosion and cavitation erosion
• Excellent resistance to stress corrosion cracking in chloride containing environments
• Listed in NACE MR 0175 for sour service
• ASME Approval for Pressure Vessel application