: : Stainless Steel Alloy 321

Stainless Steel Alloy 321

  • AMS 5645
  • ASTM-A 193
  • ASTM-A 276
  • ASTM-A 240
  • ASTM-A 479
  • QQS 763



Stainless Steel Alloy 321 Composition

  • Iron 68%
  • Chromium 18%
  • Nickel 11%
  • Titanium > 5 x Carbon

Stainless Steel Alloy 321 Description

Type 321 is a titanium stabilized austenitic chromium-nickel stainless steel which was developed to provide an 18-8 type alloy with improved intergranular-corrosion resistance. Type 321 is stabilized against chromium carbide formation by the addition of titanium. Since titanium has a stronger affinity for carbon than chromium, titanium carbide precipitates within the grains instead of forming at the grain boundaries.

Type 321 should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC), or for welding under conditions which prevent a post-weld anneal.

Stainless Steel Alloy 321 Applications

Stainless Steel Type 321 is used in aircraft parts, such as exhaust systems whjere opertaing temperatures are higher than 800ºF.

  • Aircraft Exhaust systems
  • Aircraft Manifolds
  • Chemical Processing Equipment
  • Welded Equipment
  • Jet Engine parts

Stainless Steel Alloy 321 Properties

Non-magnetic. Corrosion resistance similar to Type 304 stainless steel. Type 321 is used for welded equipment which cannot be annealed and for equipment which is operated between 800-1500°F (427-816°C). The elevated temperature stress rupture and creep strength of Type 321 is higher than Type 304 stainless steel. Room temperature yield strength is approximately 35,000 psi and tensile strength 85,000 psi.

 
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