Stainless Steel Grade 321H (UNS S32109)

Topics Covered

Chemical Composition
Mechanical properties


Stainless steel 321H is a general purpose austenitic stainless steel that is stabilized against carbide precipitation and designed to work within the carbide precipitation temperature range 427 to 816°C (800 to 1500°F). It is non-magnetic in the annealed condition and can be hardened only by cold working. Titanium is added to the alloy's composition to suppress grain boundary chromium carbide precipitation and reduce susceptibility to intergranular corrosion.

Chemical Composition

The chemical composition of Grade 321H stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe Balance
Chromium, Cr 17-19
Nickel, Ni 9-12
Manganese, Mn 2
Silicon, Si 1
Titanium, Ti 0.35
Phosphorous, P 0.045
Carbon, C 0.04-0.10
Sulfur, S 0.03

Mechanical properties

The mechanical properties of Grade 321H stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 480 MPa 69600 psi
Yield strength 205 MPa 29700 ksi
Elongation at break 29% 29%
Hardness, Brinell ≤187 ≤187


The following are some of the major applications of Grade 321H stainless steel:

  • Aircraft exhaust stacks and manifolds
  • Jet engine parts
  • Weld equipment
  • Chemical processing equipment.

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