High‑alloy SMO 254 (UNS S31254 / Alloy 254 6Mo) flanges, compliant with ASTM A182 F44 / ASME SA182 standards, designed for severe corrosion environments such as seawater, chemical processing, and offshore applications. Available in welding neck, slip‑on, blind, RTJ and other types—sizes from ½″ to 60″ NB, pressure classes up to 2500#, with full test documentation and export readiness ... https://www.calicometal.com/products/smo-254/flanges.html