ballize

verb2

1. •
   To burnish (metal) by a technique that involves pushing an oversized ball through a hole.

   • It is possible to ballize stainless steel — 1982
2. •
   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. […] — 1971