STEEL STRIP NOTCHING EQUIPMENT, STEEL STRIP NOTCHING METHOD, COLD ROLLING FACILITY, COLD ROLLING METHOD, AND MANUFACTURING METHOD OF COLD ROLLING STEEL STRIP

摘要

PROBLEM TO BE SOLVED: To provide steel strip notching equipment, a steel strip notching method, a cold rolling facility, a cold rolling method, and a manufacturing method of a cold rolling steel strip that enable cold rolling without causing a joint part rupture (weld zone rupture) even in a brittle material and a high alloy material such as a silicon steel sheet and a high-tensile steel sheet with high contents of Si and Mn.SOLUTION: Steel strip notching equipment for forming a notch in a plate width direction end portion of a joint part where the rear end of a preceding steel strip and the leading end of a succeeding steel strip are joined includes notching means that causes an amount of increase in Vickers hardness in a plate end after the notch formation to be less than Hv 50 as compared to before the notch formation, and causes an amount of dross formation to be 0.2 mm or less.SELECTED DRAWING: Figure 7