ASTM Intercontinental is a nonprofit Group that provides alongside one another professionals from a variety of industries to develop and sustain an unlimited collection of voluntary consensus specifications. Preheating is not needed for this steel. Interpass temperature mustn't exceed 150°C. Heat treatment soon after welding will not be Usually typical. 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