321 stainless steel plate

321 stainless steel plate and sheet is part of the austenitic family of stainless steel. 321 is basically a 304 grade containing a stabilizer of titanium. Type 321 is a good choice for applications where heat is an issue. 321 can be used in applications up to 900 degrees Celsius where 304 is normally used up to 500 degrees Celsius. Grade 321 has excellent forming and welding characteristics. It does not polish well so would not be used for decorative applications.

321 stainless is a titanium stabilized grade commonly used for service in the 1000-1600°F temperature range. For service temperatures up to about 1600°F, a stabilizing treatment at 1550-1650°F, air cool, may be used to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking.


321 Pipe, 321 Plate, 321 Round Bar, 321 Sheet

Common Trade Names

321, 321 Stainless, Alloy 321


AMS 5510, AMS 5645, ASME SA 240, ASME SA 312, ASME SA 479, ASTM A 240, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 312, ASTM A 479, EN 1.4541, QQS 763, QQS 766d, UNS S32100, Werkstoff 1.4541.


Oxidation resistant to 1600°F

Stabilized against weld heat affected zone (HAZ) intergranular corrosion

Resists polythionic acid stress corrosion cracking


Aircraft exhaust manifolds


Expansion joints

Furnace parts

Heating element tubing

Heat exchangers 

Woven or welded screens for high temperature mineral processing

Chemical Composition:

Carbon Max:0.08

Manganese Max:2

Phosphorous Max:0.045

Sulfur Max:0.03

Silicon Max:0.75

Chromium Range:17-19

Nickel Range:9-12

Nitrogen Max:0.1



Mechanical Properties:

Tensile Strength Min:75 KSI

Yield Strength Min:30 KSI

Elongation Min:40%

Hardness Min:95 HRB



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