These comparison table is just intended as an indication from the closest khown equivalent grades. The resource standarts really should normally be checked to the specific purpose for every material, in the event of question Preheating is not really needed for this steel. Interpass temperature shouldn't exceed one hundred fifty°C. 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