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Hot Strip
Mill | Temper
Mill
Product processed through the pickle line is designated as Hot
Rolled Sheet Pickled or Hot Rolled Sheet Pickled Non-Temper
Rolled.
Product designated as Hot Rolled Sheet Pickled is processed
through the pickle line and temper rolled. Alternately,
product designated as Hot Rolled Sheet Pickled Non-Temper Rolled is
processed only through the pickle line with no additional
processing. Therefore, any pickled applications requiring
guaranteed flatness must be ordered Hot Rolled Sheet Pickled.
In either case, the pickling operation results in coils that
have a clean bright grayish surface. The coil ends are cropped back
to gauge. These products may be ordered as dry, oiled, mill edge or
side trimmed edge. When ordered as side trimmed edge, the product
will exhibit a uniform edge with excellent width control. These
edges result in better conditions for welding as compared to a mill
edge. When product is ordered as oiled, a film of oil will be
applied for rust and surface protection. Special precautions
to prevent rust must be taken on any product ordered dry.
1. Uncoiler
Receives coils from the hot strip mill and unwraps them for
processing through the pickle line.
2. Processor
Primary purpose is to minimize tendency for coil breaks by
alternately flexing the steel around a series of small diameter
rolls. In addition, the surface oxide is cracked for improved
pickling.
3. Shear and Welder
Provide square coil ends which are welded together, so strip
can be processed continuously through the pickle line.
4. Temper Mill
Primary purpose is to increase pickling efficiency by breaking
the surface oxide which forms on the strip surface at the exit end
of the Hot Strip Mill. In addition, the temper mill provides some
degree of improved strip flatness.
5. Pickle Tanks
Remove the surface oxide from the strip by a chemical reaction
with Hydrochloric Acid (HCL). This results in a bright,
oxide-free surface that is required for many customer hot rolled
product applications or for further processing into cold rolled or
coated sheet products.
6. Rinse Tanks
Cascading water rinses clean any residual acid from the strip
surface.
7. Dryer
Removes any excess water to prevent surface rust or stain.
8. Shear
Cuts coils to the desired weight for shipment or
processing.
9. Oiler
Provides a film of oil for rust protection as well as
protection against wrap to wrap gouging during handling and further
processing.
10. Side Trimmer
Cuts each edge of the strip to provide uniform edges with
excellent width control.
11. Recoiler
This is representative of a typical surface appearance along
with a side trimmed edge of Hot Rolled Sheet Pickled
product.
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