Alleima® 321 Has good machining properties. Please Speak to Alleima for thorough suggestions on the choice of tools and slicing data. “PH”: Means Precipitation Hardening, indicating a steel which might be hardened by a special heat treatment method. Grades like 17-4PH tumble into this category. Disclaimer: Suggestions are for steerage 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