BA (Bright Annealed), is a specific surface finish which is produces by the mills for cold-rolled stainless steels, mainly for the grades 304 316 and 430 and in thicknesses up to a maximum of 3.0 mm.
During its production, the stainless steel is annealed in an inert gas atmosphere after cold rolling. This produces a reflective, shiny, smooth surface structure which, depending on the manufacturer and batch, can be close to a mirror-polished stainless steel of the lower quality grades.
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