Put the electrical steel sheet to be annealed into the iron box (according to the size of the electrical steel sheet, it is best not to exceed three layers of packing), install the rack, cover each box with a cover plate slightly smaller than the iron box (preferably made of electrical steel sheet material), lift to the furnace, lock the furnace cover, install the chimney, and open the exhaust valve.

First turn on the power switch, check whether the voltage, current and meter of the electric cabinet are normal, set the initial temperature of the temperature control meter to 400C, check whether the current of the power meter is consistent, after ensuring that the adjustment is consistent, turn on the heating switch for heating. Check whether the electric room instrument is normal or not, and adjust the power of the smoke furnace. Connect the nitrogen, check whether there is gas leakage, and check the normal supply of circulating water. When the temperature rises to 400C, open the nitrogen and nitrogen valve and inject 100-200m1 nitrogen to open the circulating water valve. When the temperature is determined to rise to 400C, the temperature is constant for about 1 hour, and the temperature of the Dahua table is also about 400C (at this time, the exhaust gas is not much).

After the heat preservation is completed, the temperature control meter is set to 500C for heating, and pay attention to whether the condition of the ammeter is consistent, and deal with any problems in time. When the temperature rises to 500C, the constant temperature is kept for about 45 minutes, at this time to see whether the furnace body changes or whether there is gas leakage, and whether the circulating water supply is normal. After the constant temperature is completed, the temperature control meter is set to 600C, and the temperature is heated. Turn up the ammonia pressure regulator and inject 200-400 m1 of nitrogen. At this time, there is more exhaust gas. When the temperature rises to 600C, the constant temperature is kept for about 45 minutes, at this time to see whether the voltage is normal. Finally, the temperature control meter is set to 680C-750C(according to the material of the electrical steel sheet, the cold-rolled non-oriented electrical steel sheet low grade domestic general annealing temperature of about 680C, the import of the same material can be appropriate +20C, non-oriented high grade general annealing temperature of about 750C. The general annealing temperature of cold-rolled oriented electrical steel sheet is about 820C). The nitrogen can be turned up a bit, or 400 m1 of nitrogen can be kept, and there is more exhaust gas at this time. After the temperature rises to the set temperature, the constant temperature time should not be less than 2 hours, and the Dahua table should also be at the set temperature, and the exhaust valve can be turned down.

After the end, turn off the exhaust valve (do not close can), nitrogen injection in 100-200m1. The circulating water valve can be closed (the outlet valve is always open), and the heating switch and power switch can be closed. After the inspection is correct, the furnace electrical steel sheet stress-relief annealing process enters a natural cooling state when the temperature in the furnace drops below 380C (preferably 350C).