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NO.4 stainless steel coil
NO.4 is one of brushed or polished surface, it is similar with HL surface, but a little different, usually if we find a long and continue line it is HL, other is NO.4 or NO.3,NO.5. etc.
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BA stainless steel coil
BA surface is a special finish, like mirror finish but not bright enough to mirror. Bright annealing also be called as brilliant annealing, is to anneal the products in a confined space slowly cooling at least 500 degrees, then make the products natural cooling still in the enclosed space, after that to get the brightness and beautiful surface, and without causing decarburization situation.
