The surface quality of 304 stainless steel plate is mainly determined by the pickling process after heat treatment. If the oxide scale formed by the previous heat treatment process is thick or the structure is not uniform, pickling can not improve the surface smoothness and uniformity. Therefore, we should give full attention to surface cleaning of 304 stainless steel plate before heating or heat treatment.
If the thickness of the oxide scale on the surface of 304 stainless steel plate is not uniform, the surface finish of the substrate metal is different under the thick place and the thin place, and the dissolution of the oxide scale on the surface is different from the erosion degree of the substrate metal on the adhesion part of the oxide scale by acid during pickling, so the surface of 304 stainless steel plate is not uniform. Therefore, during heat treatment, the oxide scale must be uniformly formed.
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