321 Stainless Steel Round Bar Properties

321 is one of the most widely used grade in stainless steel grade family. Alloy 321 stainless steel bar is a titanium stabilized austenitic chromium-nickel stainless steel which was developed to provide an 18-8 type alloy with improved intergranular-corrosion resistance.
321 stainless steel 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.
Stainless 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.

Properties
Non-magnetic. Corrosion resistance similar to Type 304 stainless steel. Stainless 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 this grade is higher than Type 304 stainless steel. Room temperature yield strength is approximately 35,000 psi and tensile strength 85,000 psi.

Hardness
The hardness of Aerodyne Alloy stock is typically 160 BHN and Alloy 321 stainless steel bar is supplied in the fully annealed condition. This grade 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.

Machinability
Rating: 80% of B-1112
Typical stock removal rate: 90 surface feet/minute with high speed tools.

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