How to Achieve Ra0.2 Mirror Finish on Stainless Steel – Mechanical vs. Electropolishing vs. Hybrid 2026-11-09
Ra0.2 is an indicator that must be clearly defined – it is both a boundary between hygiene grades and a watershed between process paths. Mechanical polishing can reach Ra0.2, and electropolishing can reach Ra0.2, but the surfaces obtained by the two are not equivalent in micro-topography, residual stress, corrosion resistance, or cleanability. Unless the specification simultaneously states "by what method Ra0.2 is achieved" and "what acceptance conditions beyond Ra0.2 apply," the number itself guarantees nothing.
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