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1.Surface Finishes
Dull Finish
Dull finish, which is attained by attaching
numerous fine grains onto the steel surface, is often
called 'pear-skin finish' or 'egg-shell texture'.
The grains are made by steel grit blasted roll.
The dull finish is useful in drawing because lubricant
oil can be evenly spread over the entire surface, thereby
reducing the possibility of friction. The
fine grains also help boost paint adherence and extend
the steel life span.
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Classification
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D1
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D3
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D5
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D7
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D9
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EA
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EB
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Dull Finish Ra(µm)
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2.00-3.00
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1.50-2.50
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1.00-1.80
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0.7-1.30
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0.40-0.80
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0.50-1.20
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0.30-0.60
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Remark
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Commercial Quality
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High Image Clarity
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TV shadow
mask
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Classification
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B0
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B2
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B4
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B6
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BC
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Bright Finish Ra(µm)
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0.50-0.70
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0.30-0.50
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0.15-0.30
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0.05-0.15
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0.27-0.42
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2.Oiling
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Steel surface is treated with lubricant
oil to prevent rusting while in storage or during
shipment. Depending on customers' request,
POSCO delivers its steel products either oiled (heavily,
generally, or lightly) or un-oiled.
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Classification
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CODE
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Oiling Amount(mg/m²)
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HEAVY
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AH
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3,000 - 4,500
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GENERAL
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AG
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1,500 - 3,000
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LIGHT
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AL
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700 - 1,500
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DOS-A
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BC
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200 - 400
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DOS-A
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BD
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50 - 100
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DOS-A
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BS
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25 - 60
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DOS-A
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BU
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10 - 25
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Un-Oiled
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X
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-
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