No.1: After hot rolling, annealing, pickling and descaling. The
surface of the treated steel sheet is a dull surface, somewhat
rough.
No.2D: It is better than N0.1, and it is also a dull surface. After
cold rolling, annealing, descaling, and finally light rolling with
rough rolls.
No.2B: This is the most commonly used in architectural
applications, except that after annealing and descaling, a final
light cold rolling with a polishing roll is performed, the other
process is the same as 2D, the surface is slightly shiny, and can
be polished.
No.2B Bright Annealed: This is a reflective surface that is rolled
with polished rolls and final annealed in a controlled
atmosphere. Bright annealing still retains its reflective surface
and does not produce scale.
No. 3: represented by 3A and 3B. "
3A: The surface is uniformly ground, and the abrasive grain size is
80-100.
3B: The rough surface is polished, and the surface has uniform
straight grains. Usually, it is polished on the 2A or 2B board with
an abrasive belt with a particle size of 180-200.
No.4: One-way surface finish, not very reflective, this finish is
probably the most versatile in architectural applications. The
process steps are firstly polishing with coarse abrasives, and
finally grinding with abrasives with a particle size of 180.
No. 6: It is a further improvement of No. 4. It is polished with a
Tampico polishing brush in abrasive and oil media. 4 surfaces.
This surface finish is not included in "British Standard 1449", but
is available in American Standard.
No.7: Known as bright polishing, it is polishing the surface that
has been ground very finely but still has scratches.
Usually a 2A or 2B plate is used, with a fiber or cloth polishing
and the corresponding polishing paste.
No.8: Mirror polished surface with high reflectivity, often called
mirror finish because it reflects a clear image. Continuous
polishing of stainless steel with a fine abrasive, followed by a
very fine polishing paste.
Surface finish level 14 = Ra 0.012
Surface finish level 13 = Ra 0.025
Surface finish level 12=Ra 0.050
Surface finish level 11 = Ra 0.1
Surface finish grade 10 = Ra 0.2
Surface finish grade 9 = Ra 0.4
Surface finish grade 8 = Ra 0.8
Surface finish grade 7 = Ra 1.6
Surface finish grade 6 = Ra 3.2
Surface finish grade 5 = Ra 6.3
Surface finish grade 4 = Ra 12.5
Surface finish level 3 = Ra 25
Surface finish class 2 = Ra 50
Surface finish class 1 = Ra 100
The above surface roughness units are all μm, that is, microns.
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