316Ti

316Ti is a titanium-stabilized austenitic stainless steel, a variant of 316 designed to resist sensitization and improve high-temperature corrosion resistance. The titanium addition binds carbon, reducing chromium carbide precipitation at grain boundaries during welding and exposure to elevated temperatures, thus preserving corrosion resistance in heat-affected zones. The alloy is similar to 316 in its basic composition—high chromium and nickel content with molybdenum to enhance pitting resistance—plus a stabilizing addition of titanium. Carbon content is kept low to further minimize sensitization.

Properties of 316Ti include good corrosion resistance in chloride-containing environments, solid formability, and weldability. It maintains strong performance at moderate to high temperatures and shows improved resistance to sensitization after welding compared with non-stabilized 316. The exact high-temperature limits depend on service conditions and exposure.

Fabrication for 316Ti uses standard techniques employed for 316, including TIG and MIG welding. Post-weld heat treatment is generally not required, though solution annealing may be used in some high-temperature applications to restore maximum corrosion resistance. Care should be taken to manage heat input during welding to prevent carbide formation and distortion.

Applications for 316Ti span chemical processing, petrochemical, power generation, and marine components where welded structures encounter corrosive media and elevated temperatures. Common uses include heat exchangers, piping, casings, and offshore equipment.

Standards and designations: In Europe, 316Ti is designated X6CrNiTi18-10; in North America it is commonly referred to as UNS S31635.