SUS321 Stainless Steel: Titanium-Stabilized for Welding

Key Characteristics & Welding Benefits:

Titanium Stabilization: Titanium chemically binds with carbon, preventing chromium carbides from forming at grain boundaries during heating (like welding).

Corrosion Resistance: This stabilization provides superior resistance to intergranular corrosion after welding, a common issue in non-stabilized steels.

High-Temperature Strength: Maintains good strength, toughness, and oxidation resistance at elevated temperatures.

Weldability: Easily welded with standard methods; post-weld heat treatment is generally unnecessary, unlike some other stainless steels.

Filler Metal: Use 347 filler metal for best results when welding 321 to 321, as titanium doesn't transfer well across the arc.

Common Applications:

Aerospace components

Oil refinery equipment

Heat Exchangers & Boilers

Pressure Vessels

Expansion Joints & Exhaust Pipes

In essence, SUS321 is the go-to choice when you need the properties of Type 304 stainless steel but with enhanced protection against weld-induced corrosion at high heat.