Steels 316L, 420, 17-4PH and 316LVM are often chosen for medical products and labelled as "surgical grade".
I am curious as to how these types of steel are used for the production of common medical tools, for example ball-tipped tools such as "dental ball burnishers". Are these cast? If so, I suppose the parting line would be visible along the tool. Or alternatively, could the steel ball, rod and handle be manufactured separately and then welded? I guess this doesn't make much economic sense. As a third approach, I have noticed piercing parts being manufacture by screwing threaded steel balls on threaded rods. Again more labour intensive than casting, but less setup costs (no molds needed).