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Stainless steel grade F55 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.

The following datasheet provides an overview of stainless steel grade F55.

Chemical Composition

The chemical composition of grade F55 steel is outlined in the following table.

Element Content (%)
Iron, Fe Balance
Chromium, Cr 26
Nickel, Ni 8
Molybdenum, Mo 4
Manganese, Mn 1
Silicon, Si 1
Copper, Cu 1
Tungsten, W 1
Nitrogen, N 0.3
Carbon, C 0.03
Sulfur, S 0.015
Phosphorous, P 0.035

Mechanical Properties

The mechanical properties of grade F55 steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 730-930 MPa 105877 - 134885 psi
Proof strength 530 MPa 76870 psi
Modulus of elasticity 200 GPa 29007 ksi
Elongation at break (in 50 mm) 25% 25%

Other Designations

Equivalent materials to grade F55 are EN 10088-3 1.4501 and ASTM A182 F55.


Grade 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




Supply Form



Thickness?0.40-4.75mm?General Width?1000?1219?1500mm

Whole Coil or piece of it

Cold Annealed?Surface 2B?2E


Thickness?4.76-60mm?Width?1500?2000?2500mm?Length?3000?6000?8000?8500mm?Under 10mm plate can be coiled?

Whole Coil or piece of it

Single hot rolling?Solid solution annealed state?Surface 1D



Whole Coil or Specified size

Cold Annealed?Surface 2B?2E

Bar & Rod

Rolled barΦ5-45mm?Length≤1500mm

Polished Bar?circle?Square?

Solution annealing,descaling

Forged barΦ26-245mm?Length≤4000mm

Weld tube

Outer diameterΦ4.76-135mm?Wall Thickness0.25-4.00mm?Length?≤35000 mm

Base on your requirement

Use for PHE

Seamless Tube

Outer diameterΦ3-114mm?Wall Thickness0.2-4.5mm

Base on your requirement

Use for PHE


Outer diameterΦ0.1-13mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Forged piece

roundness and square alloy

Base on your requirement

Steel, Alloy


All kinds of Flangs

Base on your requirement

Steel, Alloy

Welding Material

Coil wire Φ0.90mm/1.2mm/1.6mm

Base on your requirement

Certificate of Origin?America, Sweden, Britain, Germany, Austria, Italy, France.

Straight WireΦ1.2mm/1.6mm/2.4mm/3.2mm/4.0mm

Welding rodΦ2.4mm/3.2mm/4.0mm


Elbow, three links, four links, different diameter size

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Explosive bonded laminate

Raw Sheet Thickness≥2mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

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