3 mil ENP on a 316 ball ? 3 mil ENP on a 316 ball ? Mous1747 (Mechanical) (OP) 7 Dec 17 20:33 why it's not common or industry standard to 3 mil ENP on a 316 ball? but RE: 3 mil ENP on a 316 ball ? mk3223 (Mechanical) 27 Jan 18 22:53 IMO, there is no need to have ENP coating on 316SS, which is to provide a corrosion resistant surface as 316SS itself. RE: 3 mil ENP on a 316 ball ? SJones (Petroleum) 28 Jan 18 12:10 Why should it be a standard? It's generally for tribological purposes rather than corrosion control, and is a subjective materials selection. Steve Jones Corrosion Management Consultant http://www.linkedin.com/pub/8/83b/b04 All answers are personal opinions only and are in no way connected with any employer.