Abstract:When high grade non-oriented silicon steel is manufactured by single cold rolling process, the hot rolled plate must be normalized, the main purpose is to make the structure of hot rolled plate more uniform, increase the recrystallization grain, and coarsen the grain and precipitate, strengthen the favorable texture, then improve magnetic properties. In order to further decrease the manufacturing costs of high grade non-oriented silicon steel, through optimizing process of hot deforming, dynamic recrystallization is promoted, low-cost high grade non-oriented steel producing by the method of non-normalized "one-step cold rolled " would be possible. Three kinds of hot rolling process adjustment experiments were carried out for non-normalized 50W400 steel with 2.5% (Si+Al)(mass fraction), and the microstructure, texture and magnetic properties of hot rolled plate and the final product were studied systematically. The results show that dynamic recrystallization can be promoted by increasing the heating temperature, but it is harmful to the magnetic properties of product as a whole. On the premise of not increasing the heating temperature, changing the rough rolling passes from 5 to 3, increasing the final rolling temperature (RDT) of rough rolling, increasing the reduction of each pass, the dynamic recrystallization of hot rolling is promoted, which makes the recrystallized grains of hot rolled plate increase and coarsen obviously, and the favorable {110}〈001〉 texture is further strengthened, the magnetic properties of product are improved obviously. The study has certain guiding significance for non-normalized and low-cost production of high grade non-oriented silicon steel products.
光红兵, 林媛, 张文康. 热轧工艺对免常化50W400钢组织及磁性能的影响[J]. 中国冶金, 2023, 33(12): 122-127.
GUANG Hongbing, LIN Yuan, ZHANG Wenkang. Effect of hot rolling process on microstructure and magnetic properties of non-normalized 50W400 steel[J]. China Metallurgy, 2023, 33(12): 122-127.
JONAS J J,QUELENNEC X,JIANG L,et al. The Avrami kinetics of dynamic recrystallization[J]. Acta Materialia,2009,57(9): 2748.
[19]
NAKAYMA A,HONJOU N. Effects of manganese and sulfur contents and slab reheating temperatures on the magnetic properties of non-oriented electrical steel[J]. Journal or Magnetism & Magnetic Materials,2001,234(1): 55.
TOSHIAKI U,JONAS J J.Modeling texture change during the recrystallization of an IF steel[J].ISIJ International,1994, 34(5):435.
[23]
EVERY R L,HATHERLY M. Oriented nucleation in low-carbon steels[J].Texture,1974,1:183.
[24]
PARK J T,SZPUNAR J A. Effect of initial grain size prior to cold rolling on annealing texture in non-oriented electrical steel[J]. Materials Science Forum,2002,408/409/410/411/412: 1257.
[25]
PARK J T,SZPUNAR J A. Evolution of recrystallization texture in non-oriented electrical steels[J]. Acta Materialia,2003,51: 3037.