| 摘要 |
PURPOSE:To prepare a non-directional steel strip uniformly high in magnetic flux density in each direction of a plate surface in low cost, by applying hot rolling, cold rolling and winding-up to low carbon steel wherein the sum amount of Si and Al is specified under specific conditions. CONSTITUTION:Low carbon steel containing 1.5wt% or less Si and Al in sum content and comprising the remainder substantially Fe is hot rolled so as to adjust a rolling finish temp. to 600-700 deg.C and the hot rolled steel is subsequently cold rolled at once at a draft of 75-80% to obtain a final plate thickness while the rolled strip is wound up at 500 deg.C or less. In this case, annealing after cold rolling is performed at about 700-950 deg.C by a usual method and impure components such as C, S, N or O are reduced as possible. |
