Silicon steel sheet stress removal annealing process
10. When the temperature rises to 400℃, keep a constant temperature for about one hour (about the time of operating item 9), and determine that the temperature of the instrument is also about 400℃.

11. After heat preservation, set the temperature control meter at 680℃ for heating.

12. During the heating period, attention should be paid to the flow rate and temperature of circulating water. The pointer of pressure vacuum gauge should not exceed 0.1MPA; If it exceeds 0.1MPA, open the air charging valve for air discharge and keep it at 0.1MPA at all times.

13. The temperature control meter is set at 680℃ ~ 750℃

According to the material of the silicon steel sheet, the general annealing temperature of the cold-rolled non-oriented silicon steel sheet of low grade domestic BS0A600, 50W600, 50WW540 is about 680℃, the imported same material can be appropriate +20℃, the general annealing temperature of the non-oriented high grade is about 720℃.

14. After the temperature rises to the set temperature, the constant temperature time shall not be less than 2 hours, and the instrument shall also be around the set temperature.

15. After the end, turn off the heating switch and power switch.

16. After the check is correct, the furnace silicon steel sheet stress-relief annealing process enters a natural cooling state. When the temperature in the furnace drops below 380℃, open the air valve and exhaust the gas. Lift the material rack out, put it in a safe position, and then use the electric fan to blow the air tangentially until it cools to the ideal temperature. At this time, the circulating water valve can be closed.