Here is a guide on stainless steel use and selection. Chemical passivation and or pickling after welding or production - pickling and/or passivation of ground surfaces improves the corrosion resistance by two or more grades.A large improvement in corrosion resistance performance happens at a surface roughness of about 0.5 micrometer Ra. Surface finish – the smoother the finish the more corrosion resistant.It's important to consider that, although 304 stainless steel can corrode, it will not rust in normal atmospheric conditions.
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