Care & Effect of Polishing Stainless Surfaces

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Care & Effect of Polishing Stainless Surfaces 2018-04-26T11:14:40+00:00

Care must be taken when polishing to ensure consistency of surface appearance and ‘cleanness’ of cut. Microscopic Laps and Tears in the surface of Stainless Steel can lead to oxygen depletion and hence promote corrosion in certain environments e.g. a marine atmosphere.

We understand that ‘grit’ alone does not define the surface appearance or ‘cleanness of cut’. The first use of a new fine belt used on a polishing line can cut rougher than a coarse belt towards the end of its life. Aluminium Oxide belts can sometimes be aggressive and must be used carefully to avoid damage to the stainless surface. Silicon carbide polishing is generally a cleaner cut, but increased reflectivity can highlight deficiencies in the surface of the sheets.

The diameter of the polishing roll affects the angle of polishing ‘cut’ and too small a diameter can give an aggressive cut which can tear the metal surface.

There has been a trend in recent years of ‘brushing’ sheets and this generally provides a smooth fine and clean finish, but it is important to understand that a stainless surface once damaged cannot be repaired and that a good looking surface which has been brushed after polishing with an aggressive Aluminium Oxide belt, will remain damaged and therefore prone to more rapid surface staining in certain environments.

At Stainless International, we have the deep knowledge of the polishing process and sources of supply, to ensure that sheets are supplied to the highest standards and consistency that you need for your application.