This Alloy is mostly regarded to acquire similar weldability to 304 and 304L stainless While using the key variation remaining the titanium addition which eliminates or stops carbide precipitation all through welding. A preheating will not be essential for this steel. A heat treatment after welding is normally not common. https://madanijayateknik.com/service/detail/round-bar-plate-sheet-pipe-tube-stainless-steel-321-uns-s32100-din-x6crniti18-10-aisi-321-dan-321h-uns-s32109-din-x8crniti18-10-aisi-321h