Coating processes – Immersion or partial immersion – Molten metal or fused salt bath
Patent
1997-11-26
2000-05-30
Beck, Shrive
Coating processes
Immersion or partial immersion
Molten metal or fused salt bath
427421, 427329, 2983108, 72202, B05D 300, B05D 118, B23D 7104
Patent
active
060688874
ABSTRACT:
A process for producing plated steel sheet comprises the steps of heating a steel slab containing not more than 0.5 wt % C to the temperature range not lower than the transformation point Ac.sub.3, and jetting high-pressure water to the surface of a steel sheet at a discharge pressure of 300 kgf/cm.sup.2 or more at least once during hot rough rolling and hot finish rolling, thereby removing a layer of iron oxide on the surface of the steel sheet. The steel sheet is thereafter coiled while keeping a finishing delivery temperature of the steel sheet in the range of 500-800.degree. C., reducing the layer of iron oxide on the surface of the steel sheet at 50-98 % in an annealing furnace with the temperature of the steel sheet held in the range of 750-900.degree. C., and plating the steel sheet. With the process of the invention, plated steel plates having superior workability and plating adhesion can be produced at low cost, even when cold rolling and pickling are omitted from the production steps.
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Isobe Makoto
Kato Chiaki
Seto Kazuhiro
Beck Shrive
Kawasaki Steel Corporation
Kolb Jennifer L.
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