Steel sheet rolling method and steel sheet manufacturing method

Abstract

Provided are a steel sheet rolling method and a steel sheet manufacturing method that can prevent: the occurrence of external defects in steel sheets caused by coolant drips; and the occurrence of steel sheet shape defects, by appropriately controlling heat deformation of a work roll. In this steel sheet rolling method that supplies coolant to a roll constituting a rolling mill, during rolling: the amount of supplied coolant is suppressed to no more than a prescribed amount which is less than an upper normal amount, when starting operation of the rolling mill; and the amount of supplied coolant is increased to the upper normal amount if the medium elongation of the steel sheets has reached at least an upper target value.

Description

technical field [0001] The present invention relates to a method for rolling a steel plate and a method for manufacturing a steel plate, capable of preventing poor appearance of the steel plate caused by dripping (oil spot) of a coolant on the surface of the steel plate during rolling and damage to the steel plate caused by thermal deformation of work rolls. Bad shape. Background technique [0002] In the manufacturing process of steel plate, rolling is carried out by various rolling mills. In a rolling mill, the rolls that actually press the steel plate are called work rolls. In some rolling mills, coolant (hereinafter referred to as "coolant") is supplied to the rolls constituting the rolling mill for the purpose of preventing temperature rise of the work rolls due to frictional heat during rolling of the steel plate. If the supply amount of the coolant is not appropriate, the thermal deformation control of the work rolls cannot be properly performed, and even a shape de...

AI Technical Summary

Problems solved by technology

[0010] If the supply amount of the coolant 3 is suppressed for the purpose of preventing the coolant 3 from dripping, the work roll 2 cannot be sufficiently cooled, and the shape change caused by the thermal expansion of the work roll 2 cannot be properly controlled.

Therefore, only by suppressing the supply amount of the coolant 3, there is a problem that the control of the thermal deformation of the work roll 2 is poor, resulting in a shape defect of the steel sheet.

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