What is aisi 321 annealed stainless steel?

If you are sourcing high-performance stainless steel for industrial applications, understanding AISI 321 annealed stainless steel is crucial. This titanium-stabilized austenitic stainless steel is widely used in chemical, aerospace, automotive, and food processing industries, where high corrosion resistance and excellent high-temperature stability are required.

 

What is aisi 321 annealed stainless steel?

AISI 321 stainless steel is an austenitic stainless steel containing 17-19% chromium, 9-12% nickel, and a small addition of titanium. The titanium enhances the material's resistance to intergranular corrosion, particularly at temperatures between 800°C and 1500°F, making it well-suited for welded components. It can be processed into a variety of practical product forms, including sheet, coil, tube, bar, and wire.

 

Annealing AISI 321 stainless steel significantly enhances its corrosion resistance, particularly intergranular corrosion. It resists cracking during processing (such as bending and stamping) even at temperatures up to 870°C (1600°F). It also improves the material's fracture resistance at low temperatures or under impact loads. It is suitable for high-temperature applications such as boilers, furnaces, and aerospace applications.

 

321 Annealed Stainless Steel Chemical Composition

Element	Composition (%)
Carbon (C)	0.08 max
Chromium (Cr)	17.0 – 19.0
Nickel (Ni)	9.0 – 12.0
Titanium (Ti)	0.34 – 1.0
Manganese (Mn)	2.0 max
Silicon (Si)	1.0 max
Phosphorus (P)	0.045 max
Sulfur (S)	0.03 max
Iron (Fe)	Balance

321 annealed stainless steel Physical Properties

Physical Properties	Metric	English	Comments
Density	8 g/cc	0.289 lb/in³

 

What are the mechanical properties of annealed AISI 321 stainless steel?

In the annealed condition, AISI 321 stainless steel typically has a minimum tensile strength of around 500-700 N/mm² (73-102 ksi), a minimum yield strength (0.2% offset) of at least 190-205 MPa (28-30 ksi), and a minimum elongation at break of 40%. It also exhibits a Brinell hardness of approximately 150. Key characteristics include good formability, weldability, and high-temperature strength due to its titanium stabilization, which prevents carbide precipitation.

 

Applications of AISI 321 Annealed Stainless Steel plate

Chemical processing equipment (reactors, heat exchangers)

Aerospace components (engine parts, exhaust systems)

Automotive exhaust systems and turbochargers

High-temperature furnace components and heat treatment equipment

Food processing machinery and pharmaceutical equipment

 

Where can I buy AISI 321 annealed stainless steel sheets, plates, and coils?

GNEE Stainless Steel utilizes efficient tools such as laser cutting machines, CNC punching machines, and polishing equipment to process a wide range of 321 stainless steel sheets, ranging in thickness from 0.3mm to 8mm, ensuring that the products meet international standards such as ASTM A240. Each batch undergoes rigorous quality inspections before shipment, including checks on surface finish, thickness tolerance, and dimensional accuracy, to ensure that the products meet customer requirements.

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AISI 321 Annealed Stainless Steel Sheets – Bright Annealed (BA) Finish

Product Form	Thickness (mm)	Width (mm)	Surface Finish	Typical Applications
Sheets / Plates	0.5 – 3.0	1000 – 2000	Bright Annealed (BA)	Chemical processing equipment, food processing, pharmaceutical machinery
Coils / Strips	0.3 – 2.0	500 – 1500	Bright Annealed (BA)	Stamping, forming, automotive parts, industrial fabrication
Cut-to-Size Sheets	0.5 – 3.0	Custom	Bright Annealed (BA)	Custom panels, furnace components, high-temperature parts