Hot rolling mills and hot rolling methods

A hot rolling method by a hot rolling mill including:

• a pair of upper and lower work rolls;
• a pair of upper and lower backup rolls that support the work rolls;
• bending actuators that apply bending forces to the work rolls;
• work-roll horizontal actuators that move the work rolls in a horizontal direction;
• and
• backup-roll horizontal actuators that move the backup rolls in the horizontal direction,
• the work rolls satisfying a condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls, and Lb is a maximum strip width of a rolled material, the method comprising:
• adjusting an angle formed between an upper-side pair of the upper backup roll and the upper work roll and a lower-side pair of the lower backup roll and the lower work roll in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel using the work-roll horizontal actuator and the backup-roll horizontal actuator;
• and
• performing rolling in a state where a bending force is applied to the work rolls.