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SHEETFIN.TXT
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1991-02-05
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UNPOLISHED OR ROLLED FINISHES:
No. 1 A rough, dull surface which results from hot rolling to the specified
thickness followed by annealing and descaling.
No. 2D A dull finish which results from cold rolling followed by annealing
and descaling, and may perhaps get a final light roll pass through
unpolished rolls. A 2D finish is used where appearance is of no
concern.
No. 2B A bright, cold-rolled finish resulting in the same manner as No. 2D
finish, except that the annealed and descaled sheet receives a final
light roll pass through polished rolls. This is the general purpose
cold-rolled finish that can be used as is, or as a preliminary step
to polishing.
No. 2BA
or BA Non-standard but widely offered bright annealed finish, highly
reflective surface.
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POLISHED FINISHES
No. 3 An intermediate polished surface obtained by finishing with a 100-grit
abrasive. Generally used where a semifinished polished surface is
required. A No. 3 finish usually receives additional polishing during
fabrication.
No. 4 A polished surface obtained by finishing with a 120-150 mesh abrasive,
following initial grinding with coarser abrasives. This is a general-
purpose bright finish with a visible "grain" which prevents mirror
reflection.
No. 6 A dull satin finish having lower reflectivity than No. 4 finish. It
is produced by Tampico brushing the No. 4 finish in a medium of
abrasive and oil. It is used for architectural applications and
ornamentation where a high luster is undesirable, and to contrast with
brighter finishes.
No. 7 A highly reflective finish that is obtained by buffing finely ground
surfaces but not to the extent of completely removing the "grit"
lines. It is used chiefly for architectural and ornamental purposes.
No. 8 The most reflective surface, which is obtained by polishing with
successively finer abrasives and buffing extensively until all grit
lines from preliminary grinding operations are removed. It is used
for applications such as mirrors and reflectors.