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Stainless Steel Polishing
Stainless Steel polishing, often referred to as metal polishing, is the process of smoothing the surface of a fabricated piece of metal such as pipes, sheets, angles, fittings, etc.
Standard Surface Finishes of Stainless Steel:
Surface finishes on stainless steel are generally selected for appearance. The degree, extent of forming and welding should be taken into consideration when selecting raw material. You would not want to start with polished raw material that is going to be scratched in process and is going to be final polished anyway. In this instance it is often more economical to use a cold rolled finish material, and then polish.
Unpolished Stainless Steel Finishes
No. 1 Finish: Hot rolled, annealed and descaled. Produced by hot rolling followed by annealing and descaling. Generally used in industrial applications, such as for heat or corrosion resistance, where smoothness of finish is not critical or of importance.
No. 2D Finish: A dull cold rolled finish produced by cold rolling, annealing, and descaling. The dull finish may result from the descaling or pickling operation or may be developed by a final light cold roll pass on dull rolls. The dull finish is favorable for the retention of lubricants on the surface in deep drawing operations. The finish is generally used in forming deep drawn articles, which may be polished after fabrication.
No. 2B Finish: A bright cold rolled finish commonly produced in the same manner as No. 2D, except that the annealed and descaled sheet receives a final light cold rolled pass on polished rolls. This is a general-purpose cold rolled finish. It is commonly used for all but exceptionally difficult deep drawing applications. This finish is more readily available than No. 1 or No. 2D Finish.
BA Finish: (Bright annealed) bright cold rolled and controlled atmosphere annealed to retain highly reflective finish.
Polished Stainless Steel Finishes
No. 3 Finish: A polished finish obtained with abrasives approximately 100 mesh, and which may or may not be additionally polished during fabrication.
No. 4 Finish: A general purpose polished stainless steel finish widely used for restaurant equipment, kitchen equipment, store fronts, dairy equipment, etc. Following initial grinding with coarser abrasives, sheets are generally finished last with abrasives approximately 120 to 150 mesh.
No. 6 Finish: A dull satin finish having lower reflectivity than No. 4 Finish. It is produced by Tampico brushing No. 4 Finish sheets in a medium of abrasive and oil. It is used for architectural applications and ornamentation where a high luster is undesirable; it is also used effectively to contrast with brighter finishes.
No. 7 Finish: A high degree of reflectivity. It’s produced by buffing the finely ground surface, but the grit lines are not removed. It is chiefly used for architectural and ornamental purposes.
No. 8 Finish: The most reflective finish that is commonly produced. This finish, is obtained by polishing the stainless steel with successively finer abrasives and rubbing extensively with very fine buffing rouges. The surface is essentially free of grit lines from preliminary grinding operations. This stainless finish is most widely used for press plates, as well as for mirrors and reflectors.