| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing thin steel sheets which makes it possible to obtain the thin steel sheets free from the occurrence of segregation lines or crazing and makes it possible to obtain products free from the occurrence of the crazing during working and the uneven brightness and uneven hardness distribution on the product surfaces in the products formed by working these thin steel sheets. SOLUTION: The method of manufacturing the thin steel sheets of >=6 mm in thickness consisting of carbon steel or low alloy steel containing, by mass %, 0.07 to 0.4% C, <=0.4% Si, <=2% Mn, <=0.02% P and <=0.005% S and having Mn/S of >=160 comprises casting slabs of a rectangular shape in sectional shape and 250 to 350 mm in thickness under conditions of 1.5 to 2.5 m/min in speed, then hot rolling the slabs as blanks or cold rolling the same after the hot rolling. The thin steel sheets further preferably contain <=0.005% B by mass%.
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