321 Stainless Steel is an austenitic stainless steel grade renowned for its excellent stress rupture properties and superior creep resistance at high temperatures. These mechanical properties make it a step above 304 stainless steel, particularly in applications involving elevated temperatures. Classified as a Ni-Cr-Mo austenitic stainless steel, 321 stainless steel is equivalent to the domestic grade 0Cr18Ni10Ti. While its overall performance is similar to 304, the addition of titanium (Ti) enhances its resistance to grain boundary corrosion and improves its high-temperature strength, making it ideal for prolonged exposure to heat and oxidation..
321 stainless steel is widely used in industries requiring durable materials for high-temperature environments, such as aerospace, chemical processing, and heat exchanger systems. It performs exceptionally well in continuous service up to 900°C (1652°F) and intermittent service up to 800°C (1472°F). The addition of titanium not only stabilizes the steel but also prevents carbide precipitation during welding, ensuring its structural integrity over time.
