321 Stainless Steel

This is a standard austenitic 18/8 stainless steel grade, (304), but stabilized by Titanium. The titanium within means the stainless steel is intergranular corrosion resistant after heating, (between 425-900 degrees Celsius). Remarkably high strength as well as scaling resistance and phase stability set 321 Stainless Steel apart from other similar grades. This grade is not, however, recommended for welding consumable, as the titanium component does not allow good transfer of heat across a high-temperature arc.


Chemical Formula

Iron, <0.08% Carbon, 17-19% Chromium, 9-12% Nickel, <2% Manganese, <1% Silicon, 0.3-0.7% Titanium, <0.045% Potassium, <0.03% Sulphur


321 Stainless Steel Plate, 321 Stainless Steel Sheet, 321 Stainless Steel Round Bar, 321 Pipe Tube & Fittings

Common Trade Names

321 Stainless Steel, 321 Stainless


  • High strength
  • Scaling resistance and phase stability
  • Excellent forming and welding characteristics
  • Resistant to potable water with up to 200mg/L chlorides at normal temperature.


Ideal uses for 321 Stainless Steel include expansion joints, aircraft parts, furnace parts, heat exchangers, mineral processing screens, welding by all standard methods, with or without filler metal.

Available Stock Sizes

See specific product page for unique sizes. Here at Atlantic Stainless no inquiry is too large or too small. Feel free to contact us today for a quote on any of your custom size orders.

If you don’t see what you’re looking for just call one of our team members at 800.876.2700. No inquiry is too large or too small, we specialize in locating hard to find items. If you do see what you are looking, we would love to assist you and give you a quote today!