347 stainless steel datasheet: composition, properties, applications

347 stainless steel has a niobium stabilized austenite structure as its core, with a composition ratio of carbon ≤ 0.08%, chromium 17-19%, nickel 9-13%, and niobium ≥10×C%, effectively suppressing intergranular corrosion and improving high-temperature stability. Its tensile strength reaches 515-860MPa, elongation ≥40%, 0 ℃ impact energy ≥39J, and maintains an impact resistance of 70J/cm² at -253℃, with excellent oxidation and vulcanization resistance.

347 stainless steel material exhibits outstanding performance in high-temperature environments and maintains a low oxidation rate even after long-term use at 800 ℃, making it suitable for high-temperature components such as petroleum cracking units and nuclear electric heat exchangers. Its welding performance is stable, and it can be directly used for pressure vessels and aircraft engine exhaust pipes without heat treatment after welding.

347 stainless steel is widely used in pharmaceutical equipment, food processing lines, and refrigeration systems to meet hygiene standards and corrosion resistance requirements.