ASTM A240 321 Stainless Steel Composition & High‑Temperature Stability
ASTM A240 321 (UNS S32100) is a titanium‑stabilized austenitic stainless steel grade under ASTM standards. With 17–19% chromium, 9–12% nickel, and titanium added in proportion to carbon content, it prevents carbide precipitation during welding or elevated‑temperature service, improving resistance to intergranular corrosion.
321 offers superior structural stability at temperatures around 600°C, making it suitable for heat exchangers, exhaust systems, boiler components, furnace structures, and high‑temperature pressure equipment. It maintains good weldability and does not require post‑weld heat treatment.
321 is supplied as sheets, plates, tubes, bars, and strips. As a heat‑resistant upgrade to the 304 family, it provides reliable performance in high‑temperature and welded applications across petrochemical, thermal‑processing, and aerospace industries.
321 offers superior structural stability at temperatures around 600°C, making it suitable for heat exchangers, exhaust systems, boiler components, furnace structures, and high‑temperature pressure equipment. It maintains good weldability and does not require post‑weld heat treatment.
321 is supplied as sheets, plates, tubes, bars, and strips. As a heat‑resistant upgrade to the 304 family, it provides reliable performance in high‑temperature and welded applications across petrochemical, thermal‑processing, and aerospace industries.