本文确定了按Mns方案制造3％取向Si钢的主要成分:C=0.03—0.05％,Mn=0.06—0.08％,S=0.018—0.025％,[Mn][S]=(11—20)×10~(-4),O_2<0.007％。证明板坯加热温度提高,初次晶粒尺寸减小,二次晶粒尺寸增大,磁性明显提高(B_(10)>1.78Wb/m~2)而且稳定。合适的板坯加热温度随[Mn][S]积增加而提高。加入适量Al和N_2后,加热温度对磁性较不敏感,二次晶粒尺寸增大,B_(10)值进一步提高。二次再结晶开始温度也就是初次晶粒迅速长大和MnS质点开始聚集的温度。
The Suitable contents of such effective constituents determined on the basis of the MnS process may be available to produce the oriented-grain Fe-3%Si as:C 0.03-0.05%, Mn 0.06-0.08%, S 0.018-0.025%, [Mn] [S]=(11-20)×10~(-4) and O_2 0.007%. The magnetic properties of Fe-3%Si have also been influenced by the slab reheating temperature. It was observed that with the raise of the reheating temperature, the primary grain size reduced and the secondary coarsened, thus,its magnetic properties may be remarkably improved, B_(10)>1.78Wb/m~2, and stabilized.The proper reheating temperature is elevated as the increase of product [Mn] [S].However, the reheating temperature became relatively insensitive to the magnetic properties when an appropriate amount of Al and N_2 was added. The secondary grains may coarsen and value B_(10) may improve further. The starting temperature of the secondary recrystallization seems to be in correspondance with that at the beginning of rapid growth of primary grains and of the aggregation of MnS particles.
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