CONTINUOUS MANUFACTURING METHOD OF A FERRITIC STAINLESS STEEL, CAPABLE OF BEING ROLLED WITH A GRADUALLY REDUCED ROLL ILLUMINATION ON A ROLLING MILL STAND IN WHICH A STAINLESS STEEL HAS A PREDETERMINED ROLL ILLUMINATION

摘要

PURPOSE: A continuous manufacturing method of a ferritic stainless steel is provided to improve a surface quality degradation of a stainless steel due to a roping bending after a continuous cold rolling by gradually reducing a roll illumination of a rolling mill used in the continuous cold rolling.;CONSTITUTION: A continuous manufacturing method of a ferritic stainless steel comprises the following steps: a stainless steel is rolled by a continuous rolling mill equipped with more than two rolling mill stands; and a stainless steel going through a continuous rolling step is rolled by a reversible mill. The stainless steel is rolled to a gradually reduced roll illumination in a rolling mill stand having a roll illumination of less than 1.5μm and more than 0.2μm in the continuous rolling step. In the continuous rolling mill, a roll illumination of a first rolling mill stand is more than 1.0μm less than 1.5μm, a roll illumination of a second and third rolling mill stand is more than 0.4μm less than 0.8μm, and a roll illumination of a fourth rolling mill stand is more than 0.2μm less than 0.4μm.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Oil pit area ratio(%); (BB) Comparative example 1; (CC) Comparative example 2; (DD) Comparative example 3; (EE) Example 1; (FF) Example 2