1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 2. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China 3. Institute for Structural Materials, Central Iron and steel Research Institute, Beijing 100081, China 4. Hebei Iron and Steel Technology Research Institute, Shijiazhuang 050000, Hebei, China
Abstract:High-permeability grain-oriented silicon steel sheets were produced by “TSCR + pack nitriding” process in laboratory. The results show that the nitrogen contents of the experimental steels can increase to 00146%-0.0164% from the original 0.0034%-0.0084% after the pack nitriding process in which the MnN is added into the MgO coating. The secondary recrystallization cannot occur in the decarburized and non-nitrided steel samples under the experimental high temperature annealing conditions, while the start temperature of secondary recrystallization of in the decarburized and nitrided steel samples is about 980℃. The average primary recrystallization grain size before the secondary recrystallization is about 23 μm. In the experimental steel samples, most parts of AlN, which are mainly precipitated during the high temperature annealing process after pack nitriding, can inhibit the growth of the primary recrystallization grain. Though the magnetic properties of experimental steel sheets are not stable, the best magnetic properties can be achieved as: B8=1.928T,P17/50=1.174W/kg. It is feasible to produce Hi-B steel by the “TSCR+pack nitriding” process.
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李永全. 世界上第一条高合金钢薄板坯连铸连轧生产线的生产[J]. 世界钢铁, 2003, (6): 64-67.李永全, 孙焕德. 薄板坯连铸连轧与电工钢生产[J]. 宝钢技术, 2004, (6): 60-62.Klaus G, Giuseppe A, Stefano F. Recent Technology Developments in Production of Grain-Oriented Electrical Steel[J]. Steel Research International, 2005, 76(6):413.T.Sakai, M.Shiozaki, K.Takashina. A study on AlN in high permeability grain-oriented silion steel[J]. Journal of Applied Physics, 1979, 50(3): 2369-2371.董廷亮. “TSCR+渗氮”工艺试制Hi-B钢中AlN的析出行为研究[D]. 北京:钢铁研究总院. 2011.何忠治. 电工钢[M]. 北京:冶金工业出版社,1997.