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This
mini-mill produces commodity steel, primarily in the form of structural
items such as I-beams, channels, and angles, from recycled scrap
carbon steel. The plant was originally built before WW II and has
undergone numerous ownership changes and facility upgrades in the
years since. Major components of the plant include an NKK United
DC arc furnace with 70-ton tap weight, a ladle metallurgy station,
a 14-stand rolling mill, and a continuous billet caster, built by
Demag and placed into service in 1991. It
was this continuous caster that Revere was asked to upgrade in 1996.
The Casting
Process
Molten
steel flows from a ladle to a tundish vessel, and from there to
four water-cooled oscillating molds. From the bottom of each mold,
a red-hot strand of steel emerges vertically. Each strand has a
rectangular cross section that ranges from 4 x 4 inches to 7 x 12
inches, depending on the mold used. Support rollers reorient the
strands to the horizontal, and another set of rollers straighten
them. Torches cut off billets to lengths varying from 8 to 25 feet,
and the billets are conveyed to a cooling bed area before being
weighed and stacked.
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Cutting
torches have flexible connections to allow each one to ride its
freshly cast strand while cutting off a billet.
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