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Silicon steel sheet stress relief annealing process
1. Put the silicon steel sheet to be annealed into the iron box (according to the size of the silicon steel sheet, pay attention to the box should not exceed three layers) loading rack, each box of silicon steel sheet is best covered with a cover plate slightly smaller than the iron box ( It is best to use silicon steel sheet material), hang into the furnace, lock the furnace cover, press the sealing ring tightly, and connect the circulating water pipe.
2. Connect nitrogen gas, check for air leakage, and check the normal supply of circulating water.
3. Close all valves, install the vacuum tube, turn on the vacuum pump, open the vacuum valve, vacuum to -1MPA, close the needle valve and turn off the power of the vacuum pump.
4. Connect the nitrogen pipe to the inflation valve, open the inflation valve, and inject nitrogen. The pressure is between 0.03 ～ 0.1MPA, close the inflation valve and open the safety valve.
5. Install the three thermocouples of the instrument on the furnace body,
6. Check whether the voltage, current and instrument of the electrical cabinet are normal,
7. Set the initial temperature of the temperature control meter to 400 ° C, check whether the currents of the power meter are consistent, and after ensuring that the adjustments are consistent, turn on the heating switch to heat. At this time, the valve of the circulating water is opened to ensure that there is no blockage and the flow of water is smooth.
8. Check the normality of the electric room instruments and adjust the power of the annealing furnace.
9. When the temperature rises to 400 ℃, open the nitrogen filling valve (smoke exhaust), and close the inflation valve when deflating to 0.01MPA "Repeat the operation of items 3 and 4"
10. When the temperature is determined to rise to 400 ° C, carry out a constant temperature for about 1 hour (approximately the ninth time of operation), and confirm that the temperature of the instrument is also around 400 ° C.
11. After the heat preservation is completed, set the temperature control meter to 680 ℃ and heat it.
12. During heating, pay attention to the flow rate and temperature of the circulating water. The pointer of the pressure vacuum gauge should not exceed 0.1MPA; if it exceeds 0.1MPA, the inflation valve should be opened to deflate, and it should always be maintained at 0.1MPA.
13. The temperature control table is set to 680 ℃ ～ 750 ℃
(Depending on the material of the silicon steel sheet, the cold annealing non-oriented silicon steel sheet low-grade domestic BS0A600, 50W600, 50WW540 and below the general annealing temperature is about 680 ℃, the import of the same material can be appropriate +20 ℃, the non-oriented high grade general annealing temperature is 720 ℃ about.
14. After the temperature rises to the set temperature, the constant temperature time should not be less than 2 hours, and the meter should also be above and below the set temperature.
15. After the end, turn off the heating switch and the power switch.
16. After the inspection 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 ℃ (preferably 350 ℃), open the purge valve to release the gas, {black treatment should be Fill the furnace with compressed air for 5 minutes} Open the furnace cover to release the furnace. Lift the material rack, put it in a safe position and blow it tangentially with an electric fan until it cools to the desired temperature, then the circulating water valve can be closed (the outlet valve is always open),