F55 (UNS S32760 / W.Nr. 1.4501)

F55 (UNS S32760 / W.Nr. 1.4501) has excellent corrosion resistance to a wide range of areas, especially resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with critical pitting temperature that is more than 50°C (122°F). This material is known to also have high strength and extended lifecycle. It is 10% lighter than grade 316 steel, ideal for sub-zero service, and more cost effective than nickel alloys. Stainless steel grade F55 can be easily machined and welded.

Equivalent Grades


Chemical Composition, %


Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A182
Plate, Sheet and StripASTM A312
Pipe and TubeASTM A167, 240
Welding Product
OthersASTM A403


F53 with additions of chromium, molybdenum, and nitrogen F55 has enhanced pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types.


F55 steel is widely used in the following applications:

  • Pumps
  • Valves
  • Chokes
  • Bolting
  • Pipework/flanges
  • Connectors and manifolds
  • Oil and gas industry
  • Equipment in defence, chemical and marine industries