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Hot
Rolled Coil |
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| Thickness |
1.20 - 6.50
mm |
| Width |
600 - 1,650
mm |
| Inner Diameter |
760 mm |
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Pay
off Reel, Flattener, and Entry Crop Shear |
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| Before processing through
pickling and oiling line, hot-rolled coil is unwraped, its surfaces are improved
until smooth, and its head end is then sheared off. |
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Stitcher
and Notcher |
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| For processing through tension
section, the stitcher welds the steel strip of one
coil to the coil following it. The strip's edge
is sheared in a concave pattern. Coiled steel of
over 4 mm in thickness cannot be stitched or notched,
and thus must be processed one coil at a time. |
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Tension
Leveler |
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| Steel strip with a thickness of
1.20- 4.00 mm must be smoothed out with a tension
leveler before pickling. Steel strip with a thickness
of 4 mm or more is conveyed directly into the pickling
process. |
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Pickling
Tank |
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| Smooth steel strip is covered
with a film of oxides. This deposit of rust is removed
by means of hydrochloric acid in four different
tanks, each with its own specific strength. The
first tank has the weakest solution, and the last
is the most powerful. In each tank is a squeegee
roll, which prevents the acid from following along
with the steel strip as it moves through. Used acid
is treated and recycled in an acid regeneration
plant. The fumes from the acid, meanwhile, are absorbed
by water in a scrubber. The air emerging from this
process is, therefore, free of acid vapour. |
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Rinsing
Tank |
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| The steel strip that emerges from
pickling is washed in five different rinsing tanks.
The water from the fifth tank is sent back to be
used in the first tank, and is later treated and
recycled. |
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Air
Dryer |
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| The steel strip is then dried
in blasts of hot air until no moisture adheres to
it, thus preventing a recurrence of rust. |
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Side
Trimmer and Inspection Station |
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| The side trimmer ensures that
the steel strip is of the exact width desired by
the customer. The upper and lower sides of the strip
are then inspected for quality. |
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Electrostatic
Oiler |
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| Having been rinsed, trimmed, and
inspected, the steel strip is then oiled to guard
against corrosion. A film of oil with a negative
charge is sprayed over the steel, which has a positive
charge. This electrostatic method ensures firm adhesion
of the oil and a complete, consistent coating of
the steel's surface. |
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Exit
Crop Shear and Exit Mandrel |
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| The steel strip is finally cut,
wound into a coil, fitted with a strap, weighed,
and given an attractive wrapping before delivery
to the customer. |
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Hot
Rolled Coil Pickled and Oiled |
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| Inner Diameter |
580/610 mm |
| Outer Diameter |
915 - 2,100
mm |
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