SS321 is a titanium-containing austenitic stainless steel, also known as stainless steel 321 or AISI 321, and its full name is "stainless steel 321".

This material belongs to the American standard titanium-containing austenitic stainless steel, and the implementation standard is ASTM A276/A276M-17.

The main characteristics of SS321 stainless steel include good resistance to intergranular corrosion, high temperature resistance, and good mechanical properties at high temperatures.

It improves intergranular corrosion resistance by adding titanium, and is particularly suitable for outdoor open-air machines in the chemical, coal, and petroleum industries, as well as heat-resistant parts of building materials that require high resistance to intergranular corrosion.