ballize

Etymology

From ball + -ize.

verb

To burnish (metal) by a technique that involves pushing an oversized ball through a hole.“It is possible to ballize stainless steel”
To undergo such a process.“Metals that ballize successfully are: Sintered iron, sintered brass and other sintered materials. Aluminium, brass, bronze, copper, lead and cadmium. Mild and tool steels. […]”