WELDING HIGH-MOLYBDENUM SUPERAUSTENITIC STAINLESS-STEEL

A high-molybdenum, nitrogen-enriched, nickel-based filler metal was de veloped for welding superaustenitic stainless steels. The beneficial e ffects of high Ni content and nitrogen addition in reducing the solute microsegregation and the precipitation of intermetallic phases were u sed to design the filler alloy. The weld had a precipitate-free, fully austenitic microstructure and exhibited excellent mechanical properti es, and reduced hot-cracking susceptibility and high-chloride pitting- corrosion resistance.