Square Grid

Alloy 321

An austenitic chromium-nickel-titanium stainless steel, Alloy 321 offers outstanding performance at temperatures up to 870°C.

Whilst retaining good strength and corrosion resistance when exposed to high temperatures, Alloy 321 will also maintain its strength and toughness at sub-zero temperatures.


Product forms Size range from size range to
Alloy 321 round bar 9.53 mm 184.15 mm
Alloy 321 sheet & plate 0.4064 mm 20 mm

Can't find the product you need? Please contact us directly."

  • Gallery Image

    Round Bar

  • Gallery Image

    Sheet & Plate

Chemical Analysis

% Cr Ni Mo Cu Ti C Mn Si P S N Fe
Min 17 9 - - 5x (C+N) - - 0.25 - - - -
Max 19 12 0.75 0.75 0.7 0.08 2 1 0.04 0.03 0.1 Balance


Gallery Image

Perfect for applications in the Thermal Processing industry

Alloy 321 can be used in a variety of applications including:

  • Aircraft piston engine manifolds
  • Expansion joints
  • Thermal oxidizers
  • Refinery equipment
  • High temperature chemical process equipment

About Alloy 321

Alloy 321 stainless is a titanium stabilized grade commonly used for service in the 538-870°C temperature range. For service temperatures up to about 870°C, a stabilizing treatment at 842-899°C air cool, may be used to provide optimum resistance to intergranular corrosion in the heat affected zone (HAZ), and to polythionic acid stress corrosion cracking.

Alloy 321 stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are AWS ER347 bare wire and E347 covered electrodes. Alloy 321 stainless has good machinability and is readily fabricated.

For more information on Alloy 321 Stainless contact us, or fill in our online quote form and we’ll get right back to you!


7.916 g/cm³
Melting range:
1400 –1427°C


UNS Number:
UNS S32100
Werkstoff Number:
ASTM A240, A276, A312, A479, AMS 5510, 5645
Download the Alloy 321 Data Sheet Download

Request a Quote

Fill in our online form to get a fast quote. Got a question? Contact us on [email protected]