321 Stainless Steel Bar

UNS S32100 (Grade 321)

321 stainless steel bar, also known as UNS S32100 and Grade 321, is primarily comprised of 17% to 19% chromium, 12% nickel, .25% to 1% silicon, 2% maximum manganese, traces of phosphorus and sulfur, 5 x (c + n) .70% titanium, with the balance being iron. With regards to corrosion resistance, 321 is equivalent to Grade 304 in the annealed condition and is superior if the application involves service in the 797° to 1652° F range. Grade 321 combines high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Industries that use 321 include:

  • Aerospace
  • Chemical

Products partially or completely constructed of 321 include:

  • Aircraft exhaust stacks
  • Aircraft piston engine manifolds
  • Chemical processing equipment
  • Compensators and expansion bellows
  • Expansion joints
  • Furnace components
  • High temperature chemical process equipment
  • Jet engine parts
  • Manifolds
  • Refinery equipment
  • Superheater and afterburner parts
  • Thermal oxidizers
  • Welded equipment
Stocking Diameters ½” to 24”
Material Lengths Up to 12’
Bar Specifications
Uns Type Ams Astm Federal Characteristics
S32100 321 5645 A-276
A-314
A-479
QQ-S-763 321 is a titanium stabilized 300 Grade to permit use in approximately 800° F to approximately 1500° F range, without harmful carbide precipitation. 321 is subject to intergranular corrosion.
Chemistry Analysis
C MN P S SI CR NI MO CU OTHER M/NM
.08 2. .045 .03 1. 17. – 19. 9. – 12. .5 .5 Ti 5xC Min. NM

The information above is not warranted, guaranteed, or for design purposes.

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