1.4501 S32760 (F55) Super Duplex

High performance duplex steel with additions of chromium, molybdenum, and nitrogen for enhanced pitting and crevice corrosion resistance.

Superduplex UNS S32760 (F55) combines the desirable aspects of both austenitic and ferritic grades and gives significant life cycle cost advantages when used in severe and corrosive conditions.

It has exceptional resistance to pitting, crevice corrosion and to stress corrosion cracking and have high strength combined weldability.

The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >40, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media. It also provides higher strength than both austenitic and 22% Cr duplex stainless steels.

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Range

Product FormSize Range
Round Bar Peeled K1258" - 3"
If you do not see what you are looking for, please contact your local service centre with your specific requirements.

Related Specifications

  • ASTM A479
  • ASTM A276
  • NACE MR0175 ISO 15156
  • NORSOK M630
  • 1.4501
  • F55

Properties

Chemical Composition

Applications

  • Process industry components in nitric acid, dioxide, polypropylene & PVC production, caustic evaporators
  • Equipment handling organic & fatty acids
  • Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
  • Oil and chemical tankers
  • Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
  • Pollution control systems, fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
  • Pulp & paper industry components such as black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
  • Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant
  • Agrochemicals production such as fertilisers (based on wet phosphoric acid)
  • Sewage treatment, seawater cooling, desalination plants

Characteristics

  • 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

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