ASTM B423 is a standard specification that covers nickel-iron-chromium-molybdenum-copper alloy (UNS N08825 and UNS N08221) seamless tubes and pipes for general corrosion applications. The alloy composition of UNS N08825 contains nickel, iron, chromium, molybdenum, and copper, while UNS N08221 contains nickel, chromium, iron, molybdenum, and tungsten.
The ASTM B423 specification outlines the chemical composition, mechanical properties, dimensions, and other requirements for seamless tubes and pipes made from these alloys. The tubes and pipes are available in various sizes and thicknesses, and are used in applications where resistance to corrosion is critical, such as in chemical processing, petrochemical, and marine industries.
The standard provides guidelines for the manufacturing process, testing, and inspection of the tubes and pipes, including hydrostatic testing, non-destructive testing, and surface inspection. It also includes marking requirements and packaging for shipment of the tubes and pipes.
Overall, ASTM B423 is an important standard in the materials industry, as it provides a clear set of guidelines for the manufacturing and testing of nickel-iron-chromium-molybdenum-copper alloy seamless tubes and pipes, ensuring that they meet specific requirements for use in critical applications.