单向性电磁钢板的制造方法

Process for producing unidirectionally grain oriented electromagnetic steel sheet

Abstract

本发明是制造具有高斯取向晶粒和与高斯取向存在对应关系的取向的晶粒与轧制方向一致的一次再结晶组织的单向性电磁钢板的发明,在本发明的制造方法中,将以质量%计含有C:0.025~0.10%、Si:2.5~4.5%、Mn:0.03~0.55%和Al:0.007~0.040%的电磁钢板坯加热至1100~1450℃以上,实施热轧,制成为热轧板后,实施热轧板退火,接着采用分割型机架式多辊式可逆轧机实施多次的冷轧,然后实施一次再结晶退火,接着实施二次再结晶退火,从而制造单向性电磁钢板,该制造方法的特征在于:(a)使用直径为55mm以上且小于105mm的小径工作辊进行第一次的冷轧、或第一次和第二次的冷轧;(b)使用直径为105mm以上且小于150mm的大径工作辊进行第二次或第三次以后直至最后一次前的冷轧;(c)使用直径比上述大径工作辊的直径小的小径工作辊进行最后一次的冷轧。
A process for producing a unidirectionally grain oriented electromagnetic steel sheet having a primary recrystallization structure wherein Goss orientation grains and crystal grains of orientation inrelationship corresponding to the Goss orientaion are aligned in the rolling direction. In the process, an electromagnetic steel slab containing by mass 0.025 to 0.10% C, 2.5 to 4.5% Si, 0.03 to 0.55%Mn and 0.007 to 0.040% Al is heated up to 1100 DEG to 1450 DEG C or higher, and hot rolled into a hot rolled sheet. The hot rolled sheet is sequentially subjected to annealing, cold rolling multipletimes by means of a split housing cluster type reversing hot rolling machine, primary recrystallization annealing and secondary recrystallization annealing, thereby obtaining a unidirectionally grainoriented electromagnetic steel sheet. The process is characterized in that (a) the first cold rolling or first and second cold rollings are carried out with the use of a small-diameter work roll of 55 to less than 105 mm diameter, (b) the second or third to prefinal cold rollings are carried out with the use of a large-diameter work roll of 105 to less than 150 mm diameter, and (c) the final coldrolling is carried out with the use of a small-diameter work roll of diameter smaller than that of the large-diameter work roll.

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