Abstract: In order to study the edge quality of the hotrolled plate of oriented silicon steel is coarse, which readily leads to cracking during subsequent cold rolling, the thermal strength thermoplastic curve of oriented silicon steel and the thermal simulation test under various deformation conditions is measured by a thermal simulation testing machine. 
At 700 ℃ to 750 ℃, the reduction of area drops to the lowest point (approximately 35 %), and the fracture morphology shows fewer dimples, indicating brittle fracture, making it unsuitable for rolling within this temperature range. Additionally, due to the high internal distortion energy after hightemperature deformation, the deformed grains can be eliminated through static recrystallization, and the recrystallization grains grow.By reducing the roughing pass to 1+3, setting the edge heater at 90 ℃, strictly controlling the input of scaling water and cooling water in the rolling line to compensate the temperature drop at the edge of the oriented silicon steel, and using the side pressure of the vertical roll of the rough rolling 30mm to improve the degree of recrystallization at the edge,and reducing the loading gap of the oriented silicon steel to 50mm during the furnace loading,shortening the heating time of oriented silicon steel to 180 min can improve the edge quality of oriented silicon steel hot-rolled coil. The results showed that the edge quality excellence rate of oriented silicon steel hot-rolled coil is increased from approximately 30 % to more than 80 % after the process optimization, and there is no significant impact on the magnetic properties of the finished coil.

Key words: oriented silicon steel hot-rolled coil, edge quality, recrystallization, lateral pressure, heating time