Stainless Steel Grade 333 (UNS S33300)

Topics Covered

Chemical Composition
Mechanical properties


Stainless steel 333 is a high chromium nickel base alloy with excellent resistance to carburization and high temperature oxidation. It has an exceptional ability to withstand the repeated thermal shock of water or oil quenching. It is one of the few stainless steel alloys that can resist polythionic acid stress corrosion cracking and dew point corrosion by sulfuric acid.

Chemical Composition

The chemical composition of Grade 333 stainless steel is outlined in the following table.

Element Content (%)
Nickel, Ni 44 – 47
Chromium, Cr 24 - 27
Molybdenum, Mo 2.5 – 4
Cobalt, Co 2.5 – 4
Tungsten, W 2.5-4
Manganese, Mn 2
Silicon, Si 0.75
Carbon, C 0.08
Sulfur, S 0.03
Phosphorous, P 0.03
Iron, Fe Balance

Mechanical properties

The mechanical properties of Grade 333 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 738 MPa 107000 psi
Yield strength 324 MPa 47000 psi
Elongation at break 48% 48%


The following are some of the major applications of Grade 333 stainless steel:

  • Radiant tubes, muffles, retorts
  • Boilers
  • Gas turbine combustion chambers
  • Sour water stripper reboiler lining
  • Thermowells
  • Molten glass process equipment
  • Tube hangers for petroleum refining and power generation
  • Carburizing furnace fixtures
  • Calciner shells

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