310S Stainless Steel: High-Temperature Excellence

310S is a premium austenitic stainless steel grade defined by ASTM standards, primarily composed of 25% chromium and 20% nickel—elements that form its core strength. This composition endows it with exceptional oxidation resistance, even in continuous high-temperature environments up to 1,150°C (2,100°F), making it far more resilient than standard 304 or 316 grades.

One of its key characteristics is its stability under thermal cycling, which prevents embrittlement and maintains structural integrity when exposed to rapid temperature changes. It also boasts excellent creep resistance, meaning it retains shape and strength under prolonged stress at elevated temperatures. Additionally, 310S offers good weldability using common techniques, though post-weld annealing is recommended to avoid carbide precipitation.

The grade’s primary role lies in high-heat applications where corrosion resistance is equally critical. Its advantages include superior resistance to sulfur-rich atmospheres and nitric acid, making it ideal for environments where both heat and chemical attack are prevalent. Unlike lower-nickel grades, 310S resists scaling and oxidation, reducing maintenance needs in long-term use.

Typical applications span industrial furnaces (heater elements, liners), power generation (boiler components, exhaust systems), and chemical processing (high-temperature reaction vessels). It is also used in incinerators, thermal processing equipment, and aerospace components requiring sustained performance under extreme heat.