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Electropolishing For 304 Stainless Steel

Electropolishing For 304 Stainless Steel

304 Stainless Steel contains 18% chromium and 8% nickel and is non-magnetic. The reason why this metal works well by being electropolished is because it chemically removes parties at a microscopic level, making the steel impervious to rusting over time, since it transforms it into a pure metal. Electropolishing 304 steel is also extremely helpful against rust from salt, such as de-icing and ocean water.

Looking for reliable passivation or electropolishing service for your 304 Stainless Steel surfaces, pieces and parts? Celco Inc has been setting the world standard since 1986 for a wide range of chemical cleaning for metals.

Contact us with questions or call (620) 842-3701

Celco’s Youtube Electropolishing Video

Benefits Of Our Electropolishing Process

The greatest benefits of this advanced finishing method include:

  • Removing microscopic burrs and leveling on the surface of machined parts.
  • Leveling the peaks and valleys that are common on metal surfaces.
  • Creating a smooth surface to reduce friction and drag.
  • Relieving stress on the surface of the component.
  • Leaving a bright, mirror-like finish on most metal alloys.
  • Providing a more easily sterilized surface.

View Some Of Our Electropolishing Work

You can see pictures of our work on some 304 steel parts and others using the electropolishing process below and to view our whole image gallery click here.


If you are not sure if the stainless steel you need treated is 304 or some other type, please call us. Contact us with questions or call (620) 842-3701

Basic Stainless Steel Sheet Finish Designation

The following list of stainless steel sheet finish designations includes a short description of how each surface may be obtained.

  • Unpolished Finish No. 1: A dull finish produced by hot rolling to a specified thickness, followed by annealing and descaling.
  • Unpolished Finish No. 2D: A dull finish produced by cold rolling to a specified thickness, followed by annealing and descaling. May also be accomplished by a final, light roll pass on dull rolls.
  • Unpolished Finish No. 2B: A bright finish commonly produced in the same way as 2D except that the annealed and descaled sheet receives a final, light coldroll pass on polished rolls. This is a general purpose, cold-rolled finish, and is more readily polished then the No. 1 or No.2D finishes.
  • Polished Finish No. 3: An intermediate polished finish generally used where a semi polished surface is required for subsequent finishing operations following fabrication, or as a final finish with a 50- or 80-grit abrasive compound.
  • Polished Finish No. 4: A general purpose bright polished finish obtained with a 100-180 mesh abrasive, following initial grinding with coarser abrasives.
  • Buffed Finish No. 6: A soft satin finish having a lower reflectivity than No.4 finish. It is produced with a greaseless compound, #200 grit, top dressed with white rouge or chromium green rouge.
  • Buffed Finish No. 7: A highly reflective finish produced by buffing a surface that has first been refined to approximate a No. 6 finish, then buffed lightly with a white rouge without removing satin finish lines.
  • Buffed Finish No. 8: The most reflective finish commonly produced. It is obtained by flexible polishing with successively finer abrasive compounds, then buffing extensively with a very fine chromium green rouge bar compound.

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