Hot rolling method for non-oriented electrical steel thin strip
A technology for grain-oriented electrical steel and electrical steel, which is applied in the field of hot rolling of non-oriented electrical steel strips, can solve the problems of difficulty in cold rolling and difficulty in cold rolling, and achieves reduction of iron loss of finished products, improvement of production efficiency, and excellent electromagnetic properties. Effect
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Embodiment 1
[0015] Raw material composition: C: 0.003%, Si: 3.7%, Al: 0.25%, Mn: 0.35%, P: 0.015%, S: 0.003%, N: 0.025%, the rest is Fe and unavoidable impurities.
[0016] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;
[0017] 2. The steel billet is heated at 1150°C, held for 200 minutes, rolled out of the furnace to 30 mm, and the first piece is rolled into a hot coil box for heat preservation. The second billet is rolled to the same thickness, and the first billet is taken out from the hot coil box and stacked on the second billet, and then enters the finish rolling mill and rolled to 0.5mm, the starting rolling temperature is 940°C, the stand water is turned off, and the final rolling temperature is 810°C . After hot rolling, it is coiled and kept warm, and the coiling temperature is 680°C;
[0018] 3. Slowly cool to room temperature and then cut and roll;
[0019] Finished iron loss P1.5: 2.88W / kg, magnetic induction B5000: 1.70T.
Embodiment 2
[0021] Raw material composition: C: 0.003%, Si: 3.55%, Al: 0.35%, Mn: 0.25%, P: 0.018%, S: 0.003%, N: 0.025%, the rest is Fe and unavoidable impurities.
[0022] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;
[0023] 2. The steel billet is heated at a temperature of 1050°C, and after being held for 200 minutes, it is rolled out of the furnace to 30mm, and the first piece is rolled into a hot coil box for heat preservation. The second billet is rolled to the same thickness, and the first billet is taken out from the hot coil box and stacked on the second billet, and then enters the finishing mill and rolled to 0.65mm, the starting rolling temperature is 940°C, the stand water is turned off, and the final rolling temperature is 800°C . After hot rolling, it is coiled and kept warm, and the coiling temperature is 690°C;
[0024] 3. Slowly cool to room temperature and then cut and roll;
[0025] Finished iron loss P1.5: 2.85W / kg, magnetic inducti...
Embodiment 3
[0027] Raw material composition: C: 0.003%, Si: 5.0%, Al: 0.85%, Mn: 0.55%, P: 0.010%, S: 0.003%, N: 0.022%, the rest is Fe and unavoidable impurities.
[0028] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;
[0029] 2. The steel billet is heated at 1080°C, held for 220 minutes and rolled out to 30mm. Two hot coil boxes are installed in front of the finishing mill. With the same thickness, the first two billets are pulled out from the hot coil box and stacked on the third billet to enter the finish rolling to 0.5mm, the starting rolling temperature is 950°C, the stand water is turned off, and the final rolling temperature is 820°C. After hot rolling, it is coiled and kept warm, and the coiling temperature is 700°C;
[0030] 3. When the roll temperature drops to the room temperature, the edge is cut and divided into rolls;
[0031] Finished iron loss P1.5: 2.1W / kg, magnetic induction B5000: 1.68T.
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