A351 CK20

CK20 is an austenitic stainless steel casting alloy defined by ASTM A351/A351M, primarily intended for high-temperature, pressure-containing components such as reformer tubes, manifolds, and heat exchanger parts. With a nominal composition of 25% chromium and 20% nickel, CK20 offers excellent resistance to oxidation, carburization, and sulfidation in elevated-temperature service environments. Its stable austenitic microstructure ensures good creep resistance and structural integrity under long-term thermal exposure, making it a preferred material in the petrochemical, refining, and heat treatment industries. CK20 is widely used where both high-temperature strength and corrosion resistance are critical for reliable performance.