321 Stainless Steel - AMS 5510, AMS 5645
321 SS (UNS S32100) is a titanium stabilized austenitic stainless steel that features improved resistance to intergranular corrosion. This grade is suitable for high-temperature applications up to 1500°F (815°C), where the addition of titanium stabilizes the material against chromium carbide formation. Since titanium has a stronger affinity for carbon than chromium, titanium carbide precipitates within the grain instead of forming at the grain boundaries. While corrosion resistance is similar to 304 and 304L in the annealed condition, it features higher creep and stress rupture properties, making it ideal for pressure vessels and boiler applications. 321 stainless steel is non-magnetic and heat resistant for continuous service at elevated temperatures.
321 Inventory Size Ranges
0.1875" - 0.250"
0.375" - 9.000"
0.250” - 1.125”
Custom Engineered Strip
0.0008" - 0.012"
Working with 321 stainless
321 stainless materials cannot be hardened through heat treatment, only cold working. It is easily welded by all standard methods, and post-weld annealing is not required. This product is ductile and can be formed with ease. While corrosion resistance is generally excellent, especially against dilute organic acids, 321 SS is not suitable for chloride solutions, where it is susceptible to pitting and crevice corrosion.
Machining 321 stainless
Alloy 321 is prone to work hardening and can be difficult to machine due to the addition of titanium – recommend rigid, powerful machining with minimal vibration and a quality lubricant, with tools kept sharp at all times. Avoid interrupted cuts to prevent unnecessary work hardening.
Purchasing 321 stainless steel in sheet, coil, round bar, and hex bar
We are suppliers of 321 stainless steel sheet, coil, hex bar, and round bar stock in a variety of lengths and widths, and we can custom cut this material to your exact specifications. Our stainless steel coil can also be slit to your desired width.
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Standard Inventory Specifications
- UNS S32100
- UNS S32109
- AMS 5510
- AMS 5645
- ASTM A 167
- ASTM A 240
- ASTM A 276
- ASTM A 479
- ASME SA 167
- ASME SA 240
Other industry standards we comply with:
- GE Aircraft Engine (GT193)
- RR SABRe Edition 2
- DFARS Compliant
Common Trade Names
- ATI 321 (™ Allegheny Technologies)
Common Applications of 321
- Useful in the chromium carbide precipitation range (800-1500°F, 427-815°C)
- Aircraft exhaust stacks
- Chemical processing equipment
- Welded equipment
- Jet engine parts
- Heat Exchangers
- Expansion joints
321 Physical Properties
|Grade||Density||Modulus of Elasticity in Tension||Melting Range|
|321||7.92||0.286||28 x 106 psi
|347||7.96||0.288||28 x 106 psi
|20-100||68-212||16.6 x 10-6||9.2 x 10-6|
|20-600||68-912||18.9 x 10-6||10.5 x 10-6|
|20-1000||68-1832||20.5 x 10-6||101.4 x 10-6|
|Temperature Range||W/m·K||Btu · in / hr · ft2 · °F|
|Temperature Range||J/kg K||Btu/lb · °F|
- H/m Annealed
- 1.02 Max
Mechanical Properties and Yield Strength of 321
|Property||Type 321||Type 347|
|Yield Strength, 0.2% Offset
|Ultimate Tensile Strength,
|Percent Elongation in 2 in. or 51 mm||40.0||40.0|
RB (Sheet & Strip)
Please contact us for more details.
The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.