| 摘要 |
PURPOSE:To eliminate the edge crack of hot coil, by heating at a high temperature and limiting the temperature difference of start and end of finish rolling after rough rolling at the time of carrying out hot rolling of slab containing a specific amount of C.Si and Mn. CONSTITUTION:At the time of carrying out hot rolling of continuous casting slab composed of C<=0.085%, Si;2-4%, Mn<=0.15%, Fe and inevitable impurities; balance, finish rolling is carried out controlling the temperature difference (DELTAT) of start and end of the finish rolling within 220 deg.C after heating at a high temperature of more than 1300 deg.C and carrying out rough rolling. By the above method, the secondary recrystallization after the last finish annealing, is perfect and magnetic characteristics in rolling direction is superior and also, product being B10 characteristics of 0.3mm thickness product at last 1.74Wb/m<2>, is able to manufacture stably in industrial scale. |
