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321 Stainless Steel Bar

Spec: AMS 5645

321 Stainless Steel Bar AMS 5645
UNS S32100
PDF: 321 Stainless Steel Bar

Nominal Composition


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.


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.


The hardness of Aerodyne stock is typically 160 BHN and Type 321 stainless steel bar is supplied in the fully annealed condition. Type 321 stainless steel can not be hardened by heat treatment, but small sections can be cold work hardened. For applications requiring maximum corrosion resistance, a stabilizing heat treatment at 1550-1650°F (843-899°C) for up to 5 hours may be used to dissolve any chromium carbides and preferentially form titanium carbides.


80% of B-1112

90 surface feet/minute with high speed tools.

Has a high rate of work hardening and requires a rigid set-up, plenty of power and positive cuts.


0.290 lbs/in3, 7.86 g/cm3

Standard Inventory Specifications

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