For the purpose of definition, a finish is a mechanical or chemical treatment on the surface that imparts a particular interaction behavior with light. When it comes to stainless steels, finishes fall into either one or a combination of the following categories;
While each of these finishes have their own particular nuances, they all start at the mill. These finishes are applied to the surface as the metal is cold worked and reduced, then annealed and pickled. This stable surface finish serves as the base for all subsequent layers and can be left untouched or further refined.
The following finishes are produced at the mill and are provided, as is, for use in art and architectural projects:
2D Finish: The least refined surface available for thin sheet material. The 2D surface is dull and characterized by a dark steel-like appearance. It is sometimes used on roof surfacing materials or other cladding surfaces (where light reflectivity and the associated glare are required to be minimized).
2B Finish: Characterized by a surface more refined and glossy than 2D. This is a base finish for many mechanically applied finishes. Occasionally the 2B finish is used on an artistic or architectural surfacing material without additional mechanical treatments.
2BA Finish: This is the most refined of the mill finishes and is characterized by a mirror-like reflectivity. The bright annealed surface is very smooth and generally free of surface markings or streaks. It is used as a base for many mechanical finishes and chemical finishes, including mirror polishing, satin polishing, glass bead blasting, and Angel Hair polishing.
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