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VTD
VTD (Vacuum Tank Degasser) is a vacuum degasser facility
that can manufacture high-quality products, which was
not possible with the conventional ladle furnace (LF).
De-carburization, de-nitrogenization, and de-sulphurization
occur in the vacuum of 60 - 70pa and oxygen is blown in
to enhance the de-carburization capacity. |
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Caster
Thin slab caster manufactures slabs 67.5mm thin at the
maximum speed of 5m/min. EMBR (Electric Magnetic Brake
Ruler) optimizes the cast fluidity and the dynamic cooling
controls the slab cooling capacity in accordance with
the casting speed. In addition, the resonance mold steel
type that can have its mold vibration pattern adjusted
during casting as well as the liquid core reduction that
join non-crystallized slabs all contribute to the making
of slabs with outstanding surface and internal quality. |
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Reduction Mill
After the 67.5mm-thin slabs are produced by the caster,
they are rolled into 20 to 30mm bars depending on the
thickness of final products. Then they are cut into appropriate
length with the maximum unit weight of 24 tons. The continuous
mill reduces the rolling strain of finishing, which facilitates
the mass production of thin slabs. |
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Inductive Heater
Continuous rolling process tends to lower the bar temperature
but eight induction coils heat up the bars at a consistent
temperature, allowing the bars to maintain the temperature
of 1,100·Æ C at the exit. |
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Coil Box
Coil box, introduced for the first time in Korea, reels
the rolled bars and keeps them at a constant high temperature
to eliminate the temperature difference between the front
end and the back end as well as to reduce the quality
fluctuation inside the coil. The coil box is equipped
with 20 COG burners to maintain the proper temperature
and it is large enough to store 10 coils. |
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Finishing Mill
Finishing mill rolls the 20 - 30mm bars into those with
the final thickness between 1.2 - 12.7mm. The finishing
mill is structured in 4-high 5-stand type, and on-line
grinders as well as pair cross mill that controls crown
are installed to raise the product quality. |
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Skin Pass Mill
This 4-high 1-stand mill levels the coil shape and improves
the mechanical properties of coil by skin passing room-temperature
strips. |
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