321 Stainless Steel Bar (AMS 5645)
Arch Metals supplies 321 stainless steel bar from Dallas, Texas, to aerospace, energy and fabrication customers across Texas and the surrounding states. 321 is an austenitic stainless steel stabilized with titanium, so it resists intergranular corrosion after exposure to temperatures between about 800°F and 1500°F. We supply annealed 321 bar to AMS 5645 and ASTM A276/A479 with certified material and saw cutting to length. Request a quote and we’ll confirm sizes and availability.
321 Stainless Steel Forms
- Round bar, annealed
- Hex and flat bar on request
- Plate and sheet on request
Size availability changes with mill supply. Send us your sizes through our quote request form and we’ll confirm stock, lead time and pricing.
321 Stainless Steel Condition and Specifications
- Annealed bar (AMS 5645, ASTM A276, ASTM A479): solution annealed for best corrosion resistance and ductility. 321 is not hardenable by heat treatment; strength comes only from cold work.
- Equivalent designations (UNS S32100): also known as Type 321 and 18-10Ti in some international standards.
Not sure which condition or specification your drawing calls for? Send us the print requirements and we’ll match the material.
Typical Properties of Annealed 321 Stainless Steel
- Ultimate tensile strength: about 90 ksi (620 MPa)
- Yield strength: about 35 ksi (240 MPa)
- Elongation: about 45%
- Hardness: about 80 HRB
- Density: 0.286 lb/in³ (7.92 g/cm³)
- Chemistry: about 18% chromium and 10% nickel, stabilized with titanium
These are typical values for annealed bar. Guaranteed minimums vary by specification, condition and size, so check the governing spec or your mill cert for design values.
Why Engineers Choose 321 Stainless Steel
Standard 304 stainless steel can lose corrosion resistance at the grain boundaries when it sits in the 800°F to 1500°F range. The titanium in 321 ties up carbon so that sensitization doesn’t happen, which makes it a reliable choice for parts that run hot or are welded and not annealed afterward. For the same job with a niobium-stabilized grade, see 347 stainless steel bar. Common uses for 321 include:
- Aircraft exhaust manifolds and collector rings
- Jet engine and turbine components
- Expansion joints and bellows
- High-temperature chemical process equipment
- Furnace parts and heat exchangers
321 Stainless Steel FAQs
What is the difference between 321 and 304 stainless steel?
321 adds titanium to stabilize the alloy against carbide precipitation, so it keeps its corrosion resistance after long exposure to 800°F to 1500°F. 304 is lower cost and is the better choice for general room-temperature service.
What is the difference between 321 and 347 stainless steel?
Both are stabilized austenitic grades. 321 uses titanium and 347 uses niobium (columbium). 347 is often preferred for welding filler and very high-temperature service, while 321 is more common in bar and sheet.
Can 321 stainless steel be hardened?
No. 321 cannot be hardened by heat treatment. It can be strengthened by cold working, and it is normally supplied annealed.
Cut-to-Size 321 Stainless Steel With Delivery Across Texas
We ship 321 stainless steel throughout Texas, Oklahoma, Louisiana, New Mexico and Arizona, and we saw bar and plate to the size you need. See our processing services for cutting options, or browse all the metals we supply. We also supply 347 stainless and 17-4PH stainless bar.
To get pricing, send us the grade, condition, form, size, length and quantity through our quote request form, or call (888) 444-6061.