|
|
U. S.
Steel Prepainted Sheet is produced by direct application of a paint
(after applying a treatment and, in most instances, a primer) onto
steel sheet in a coil-coating line. Coil-line painting can be
used to apply a paint coating directly on uncoated steel sheet or
on metallic-coated steel sheet. For maximum corrosion resistance,
coil-line painting is often done on metallic-coated steels
including galvanized, GALVALUME®, and terne coated
sheet.
Prepainted, coated steel sheet offers users a unique combination
of advantages: the strength of steel, the corrosion
resistance of a metallic coating and the beauty and additional
corrosion protection of paint.
|
|
|
U. S. Steel Prepainted Coated Sheet offers users a
custom prepainted, coated steel sheet ready for fabrication.
Produced on high technology coil coating lines under rigid quality
controls, this product has a painted finish that is uniform in
color, gloss, texture and thickness, with excellent paint adhesion
and durability. Today's combinations of metallic coatings and paint
systems provide corrosion resistance and formability at levels
considered impossible only a few years ago. Steel sheet can be
readily rollformed, bent, and stamped without degradation in the
quality of the paint.
|
Prepainted steel sheet can be very cost-effective for
fabricators of painted steel sheet products. Because it requires no
in-plant painting either before or after fabrication, prepainted
steel sheet eliminates the user's capital burden of paint
facilities as well as painting costs associated with the
preparation, handling, spraying and baking or drying
operations. Also, the costs of meeting stringent disposal
requirements for paint chemicals are eliminated. Users of
prepainted sheet can realize significant savings in payroll,
equipment maintenance, inventory, yield loss and other costs
associated with operating in-plant painting lines. Prepainted
sheet also offers the benefits of a faster and simpler operation
without the worker-protection and environmental/pollution problems
that accompany painting operations.
|
|
By working closely with the paint suppliers and the
coil coating industry,
U. S. Steel has assisted in the development of primers and paints
that offer very excellent qualities for the user. Paint hardness,
paint gloss, resistance to chalk, fade, and peel, paint
flexibility, and other attributes of prepainted steel sheet have
been advanced to a high level of quality to enable its use for many
industries including the automotive, appliance, furniture, and
construction industries.
During the past 10 to 20 years, there have been
many advances in the development of prepainted steel sheet. In
order to take advantage of these technological advancements, the
user needs to take many issues into consideration. Today, these
issues can be addressed very quickly because of the long list of
successful applications that have been implemented. Questions that
need to be answered include: the properties of the steel, the type
of metallic coating if any, the metallic coating thickness, the
paint attributes with respect to flexibility, hardness, chalk and
fade resistance, etc. Obviously, these decisions depend on the
application and the performance desired by the manufacturer.
| Prepainted steel sheet for exterior use consists
of:
1. Topcoat which provides
color, pleasing appearance and a barrier film to enhance long-term
durability.
2. Primer coat to prevent
undercutting of paint and enhance corrosion resistance.
3. Pretreatment layer applied
for good adhesion and to enhance corrosion resistance.
4. Galvanized or
GALVALUME® coating for added corrosion
resistance.
5. Base steel sheet.
|
|
|
 |
Roll
application of paint to steel sheet in a continuous coil-coating
paint line. In this modern process, computer control ensures paint
films of uniform high quality -- corrosion resistant and so tough,
flexible, and adherent that they withstand forming of the sheet
into many shapes.
|
GALVALUME® is a registered trademark of BIEC
International Inc.
Return
to top
|
