Method of manufacturing a rolling method and ultra-thin steel plate of cold-rolled steel sheet

摘要

PROBLEM TO BE SOLVED: To obtain an ultra thin steel sheet having sheet thickness of ≤0.1 mm, which has a fine shape on the second cold rolling stage without performing shape correction by temper rolling and to prevent a coil thereof from crushing.;SOLUTION: When obtaining the ultra thin steel sheet having sheet thickness of ≤0.1 mm by performing cold rolling twice by using a cold tandem rolling mill having a plurality of multistage rolling stands of four or more stages, in the second cold rolling, the work rolls of the final stand are taken as dull rolls in which average length Rsm of a roughness curve element which is a surface roughness parameter measured in the axial direction and circumferential direction satisfies 25 μm≤Rsm≤55 μm and the elongation percentage of the final stand is taken as ≤0.3%.;COPYRIGHT: (C)2013,JPO&INPIT