SS 321/321H

SS 321 and SS 321H are austenitic stainless steels that are primarily composed of chromium, nickel, and titanium. They are designed to provide excellent resistance to intergranular corrosion, which is often a concern in high-temperature environments. Both grades are similar to SS 304 in terms of chemical composition, but with the addition of titanium to stabilize the material, preventing chromium carbide formation during welding.

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Advantages of SS 321/321H:

• Excellent Resistance to Intergranular Corrosion: The titanium stabilizes the material, preventing chromium carbide formation at grain boundaries, which is a common issue in stainless steels exposed to high temperatures.
• High-Temperature Performance: Both SS 321 and SS 321H offer outstanding resistance to high-temperature oxidation and scaling. SS 321H, in particular, has better high-temperature strength and creep resistance, making it ideal for critical applications.
• Corrosion Resistance: These grades provide superior corrosion resistance, especially in high-temperature environments where other austenitic stainless steels might fail.
• Weldability: Both grades have good weldability due to the stabilizing effect of titanium, which minimizes the risk of sensitization during welding.