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以工业高磁感取向硅钢的化学成分为基础,采用真空感应炉冶炼了两炉试验钢,其中一炉为基体钢未添加微合金元素作为对比钢,另一炉钢中添加了微合金元素Nb以形成新型抑制剂。采用石英管直接伸入钢水吸取少量钢水后迅速插入水中进行急冷。电子显微镜的分析结果表明,试样中的大型夹杂物为MnS与Al2O3和/或MgO的复合物。基体钢以及Nb微合金化试验钢急冷样品中都弥散分布着细小的析出物,这些细小析出物的直径约为几个纳米。Nb微合金化的高磁感取向硅钢中,不仅有MnS和AlN的细小析出物,还有大量细小的Nb(C,N)析出颗粒。采用Nb微合金化有望降低取向硅钢的板坯加热温度,还可能会进一步增强抑制剂的抑制效果。
Based on the chemical composition of industrial high magnetic induction oriented silicon steel, two furnace test steels were smelted by a vacuum induction furnace. One furnace was a base steel with no micro-alloying elements added as comparative steel and the other furnace steel was added with micro-alloying elements Nb To form a new type of inhibitor. Using quartz tube directly into the molten steel draw a small amount of molten steel quickly inserted into the water quench. The results of electron microscopy analysis showed that the large inclusions in the sample are the complex of MnS with Al2O3 and / or MgO. The matrix steel and the Nb microalloyed test steel quenched samples are dispersed with fine precipitates. The diameter of these fine precipitates is about several nanometers. Nb micro-alloyed high-magnetic-oriented silicon steel, not only fine precipitates of MnS and AlN, there are a large number of fine Nb (C, N) precipitated particles. Nb microalloying is expected to reduce slab heating temperature of oriented silicon steel, may also further enhance the inhibitory effect of the inhibitor.