Hot rolling mills and hot rolling methods

A hot rolling mill comprising:

• a pair of upper and lower work rolls;
• a pair of upper and lower backup rolls that support the work rolls, respectively;
• work-roll horizontal actuators that move the work rolls in a horizontal direction;
• backup-roll horizontal actuators that move the backup rolls in the horizontal direction;
• and
• a control apparatus that controls angle adjustment by the work-roll horizontal actuators, and angle adjustment by the backup-roll horizontal actuators, wherein
• the control apparatus
• adjusts angles of an upper-side pair of the upper work roll and the upper backup roll, and a lower-side pair of the lower work roll and the lower backup roll in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel to obtain a pair cross angle at which the upper-side pair and the lower-side pair cross each other such that the pair cross angle becomes equal to or greater than 0.2 degrees;
• and thereafter
• controls the work-roll horizontal actuators and the backup-roll horizontal actuators such that the angles of the upper work roll and the lower work roll are adjusted in a state where the angles of the upper backup roll and the lower backup roll are maintained.