Large unit weight hot rolling process and rolling apparatus therefor
AssigneeKawasaki Steel Corporation
InventorsTakatsugu Nitoh, Hidehiko Kimishima
Life of this patent
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Abstract
A sheet bar having a thickness of 20 to 50 mm, as continuously cast by a sheet bar caster, is passed as it is through a first sheet bar twister and is then wound in an up-end state into an up-end sheet bar coil. Then, this up-end sheet bar coil is rewound, passed through a second sheet bar twister, finish-rolled and wound into a hot coil. As compared with the slabbing—high draft rolling process of the prior art, the invention is advantageous in that it can improve the quality, production yield and production efficiency and can reduce the cost for an apparatus such as the cost for its construction and maintenance.
Claims20
A large unit weight hot-rolling process for sheet bars, comprising:
- passing a sheet bar having a thickness of 20 to 50 mm, as continuously cast by a sheet bar caster and without heavy rolling, through a first sheet bar twister and then winding it in an up-end state into an up-end sheet bar coil;
- unwinding said up-end sheet bar coil;
- finish-rolling the unwound sheet bar coil through a second sheet bar twister;
- and
- winding the finish rolled sheet into a hot coil.
A large unit weight hot-rolling process for sheet bars, comprising:
- passing a sheet bar having a thickness of 20 to 50 mm, as continuously cast by a sheet bar caster and then lightly rolled without heavy rolling, through a first sheet bar twister and then winding it in an up-end state into an up-end sheet bar coil;
- unwinding said up-end sheet bar coil;
- finish-rolling the unwound sheet bar coil through a second sheet bar twister;
- and
- winding the finish rolled sheet into a hot coil.
An apparatus for hot-rolling a large unit weight sheet bar coil continuously, comprising:
- (1) at least one sheet bar caster;
- (2) at least one light draft rolling mill operatively directly connected to the sheet bar caster;
- (3) a first sheet bar twister disposed downstream of the light draft rolling mill and upstream of a winder to wind a sheet bar coil, for reorienting a lightly rolled sheet bar from a horizontal position to an upright position;
- (4) at least one winder downstream of the twister for winding the sheet bar coil in an up-end state;
- (5) a device for thermally holding or heating said up-end sheet bar coil positioned downstream of the winder;
- (6) at least one unwinder positioned to receive up-end sheet bar coils from the thermal holding or heating device and for unwinding said up-end sheet bar coil;
- (7) a second sheet bar twister disposed just downstream of an unwinder for unwinding said up-end sheet bar coil, for reorienting the sheet bar from the upright position to the horizontal position;
- and
- (8) a finish-rolling mill downstream of the second twister.
Dependencies are inferred from the claim text.