ASTM B725 Alloy 201 (UNS N02201) is a high‑performance nickel alloy tube and pipe grade manufactured according to the ASTM B725 / ASME SB725 specification. Alloy 201 features a low‑carbon, nickel‑rich composition that delivers excellent corrosion resistance, enhanced ductility, and good strength in a wide range of environments, including acidic and chloride‑bearing media. Compared to Alloy 200, Alloy 201 offers improved resistance to intergranular corrosion and reduced susceptibility to carbide precipitation at elevated temperatures. These tubes and pipes are widely used in chemical processing, desalination, heat exchanger systems, marine engineering, and industrial piping where reliable corrosion performance and dimensional stability are critical.