The invention, and the surface properties are excellent, and its main purpose is to provide a method to manufacture a hot-rolled steel sheet available for producing a hot rolled steel sheet having a microstructure and a manufacturing apparatus.
The present invention, the heating device, descaling device and finish rolling mills heat, and a cooling unit arranged above finishing mill column, using a rapid cooling apparatus arranged immediately after the finishing mill column, controls the operation of the heating apparatus, cooling apparatus and quenching device and confined series temperature of the finish rolling mill heat the inlet T1, finishing mill in the manufacture of hot-rolled steel sheet method for controlling the heat final stand confined in the inlet-side confined series temperature T2 and quenching device the outlet side of the extending temperature T3, and the heating device, di scaling device, finishing mill heat, and having a quenching device, and control means disposed in the cooling unit, immediately after the finishing mill heat, the finishing rolling mill to heat, the heating device by the control means, to control the operation of the cooling apparatus and the quench unit and to apparatus for producing a hot rolled steel sheet for controlling the T1, T2, T3.