finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 17555

Polishing of stainless steel


2002

Hello all,

I am looking for a way to get a surface finish around 4 Ra or better on Stainless Steel without using EP. And of course, I'm looking for the cheapest means possible. However, the parts will be used in an Ultra High Purity setting in the semiconductor industry, so surface chemistry is a must. The parts will go through a citric passivation process after whatever polishing we end up on. I was looking into using felt bob's with some time of diamond compound; is this a good low cost solution? -KB

Kevin Bennett
- Santa Clara, California


simultaneous 2002

Hi Kevin,

Any abrasive polish can leave embedded particulates in the surface, and can disturb the material grain structure at the surface. Both are lethal to semiconductor processes as they can release microparticles into entrained gas streams. These are two of the many reasons why CMP was developed. I'm curious, though. Why the prohibition on electropolish? It leaves an excellent surface and passivates far better than Citric. Its used quite commonly for Stainless semiconductor vacuum equipment and internal surfaces of gas manifold valves & piping. It can also be done on the most complicated gizmos...internal bores and out. But EP is a bit sensitive to selection of raw materials.

Dave Kinghorn
Dave Kinghorn
Chemical Engineer
SUNNYvale, California



2002

CMP (Chemical Mechanical Polished) stainless steel surface can be polished to Ra of less than 1 microinch. If we can be of service, please let me know.

Thanks,

Michael Liu Taylor
Michael Liu Taylor
   specialty stainless steel distributor
Dallas, Texas



2002

A couple of things. Any fine surface profile is not normally cheap. Then again, it depends upon where you are starting from, then comes volume of parts to be process and configuration. You already told us the metal. The fastest way to improve a surface finish is by using an abrasive mechanical process and that is also normally the cheapest. That usually means mass finishing systems, but it can involve buffing. The surface profile of 4Ra is a good finish but is commonly achieved using maybe a 2 step mass finishing process.

P.S.: A diamond dust compound and wheel bob is an expensive proposition and not worth the effort for that Ra. If you want to use a wheel, use a non-woven abrasive wheel. That should accomplish 4 Ra surface finish.

tony kenton
AF Kenton
Hatboro, Pennsylvania



If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2019 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.