MANUFACTURING FOR HOT ROLLED STEEL SHEETS WITH DECREASED SURFACE CRACK BY MINI MILL AND HOT ROLLED STEEL SHEETS FABRICATED USING THE SAME

摘要

The present invention relates to a method for manufacturing a hot rolled steel sheet by a mini mill process and a hot rolled steel sheet manufactured thereby comprising: a step for manufacturing a slab by casting continuously a molten steel including less than or equal to 0.07% of a carbon equivalent (Ceq) represented by the following equation 1, less than or equal to 50 of a ratio of a manganese content to a sulfur content, and less than or equal to 0.008 wt% of a sulfur content; and a step for manufacturing a steel sheet by rolling the slab. equation 1 carbon equivalent (Ceq) = carbon content + manganese content/4 + silicon content/7.