Chen Jinqi,Cheng Zhaoyang,Feng Dajun,et al.Preparation of 6.5%Si High Silicon Steel by Pack Rolling Method and its Performance Characteristics[J].Special Steel,2023,44(04):114-119.
Chen Jinqi,Cheng Zhaoyang,Feng Dajun,et al.Preparation of 6.5%Si High Silicon Steel by Pack Rolling Method and its Performance Characteristics[J].Special Steel,2023,44(04):114-119. DOI: 10.20057/j.1003-8620.2023-00032.
Preparation of 6.5%Si High Silicon Steel by Pack Rolling Method and its Performance Characteristics
In view of the brittleness and difficulty in rolling of 6.5% Si high silicon steel at room temperature, ordinary silicon steel hot rolled plate (≤3%Si) is used to cover the high silicon steel (6%-8%Si) billet, and produce 0.3 mm thickness high silicon steel strip by hot rolling, warm rolling and high temperature annealing. It is found that the hot-rolled high silicon steel by pack rolling has a brittle-ductile transition in the range of room temperature and 280 ℃, the elongation increases significantly at 280 ℃, and the fracture morphology exhibits a large number of toughness nests, manifested as plastic fracture. According to the real-time monitoring of the process parameters, it can be seen that the average rolling force of the pack-hot-rolled 6.5% high silicon steel during warm rolling at 550-600 ℃ is related to the plate thickness, roller gap, material hardening degree, rolling temperature and other factors. The reduction rate first increases and then decreases with the thickness reduction. The reason for the reduction is related to the saturation of rolling load and the proximity of rolling thickness to the target thickness. The ratio of the cladding layer to the core layer of the warm-rolled-finished plate is 1/5. Warm rolled plate with a thickness of 0.3 mm was annealed at high temperature, and the high-frequency iron loss P
0.2/10k
of finished plate is 78.8 W/kg, presenting excellent magnetic properties, which is significantly lower than that of the ordinary silicon steel with 3% Si.
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