F61 (UNS S32550 / W.Nr. 1.4507)

F61 (UNS S32550 / W.Nr. 1.4507) steel compared with F53 and F55 steels it delivers increased strength and corrosion performance. Its minimum yield strength exceeds 550Mpa, whereas other grades are limited to 550Mpa. In addition, it contains up to 2.0% of copper, which aids pitting corrosion resistance.

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


High performance 25% chromium super duplex (austenitic/ferritic) steel with 1.75% copper. Good strength/ductility combinedwith high resistance to all forms of corrosion.


F61 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