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After that the coil is passed through Zinc
pot where Zinc coating is carried out. Zinc and Antimony of highest purity
are used for coating sheets in a technologically advanced Hot-dip process.
The bath temperature would be 440 to 460 C. This operation is performed
at a precise temperature set up. Due care is taken for pretreatment
of substrate on which Zinc coating takes place and consequently increases
the life and performance of the galvanized sheets. The percentage
of Al, Sb and Sn in the batch would be 2 to 3%, 0.35 to 0.45% and 0.30
to 0.40%, respectively.
Zinc coated coils thus passed through Chromate
solution to safe guard the coils from white rusting and other atmosphere
reaction, which further passes through Tension Leveller to improve the
shape of product and give perfect flatness. The chromic acid concentration
shall be 20 to 25 gm/ltr with a temperature of 40 to 45 C.
At the exit, coils are coiled. These
total process are completed in in-line in the continuous line and
the line speed adjusted with strip guage.
The total installed production capacity
of CGL-1 and CGL-2 are 96488 MT/annum and 161054 MT/annum, respectively.
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