The temperature of silicon steel sheet during annealing should not be too high or too high. Too high temperature will affect the insulation coating or make the lamination bonding. As for the common temperature of silicon steel sheet, we make the following explanation. Generally, the temperature of oriented silicon steel sheet is about 800 ℃, and that of non oriented silicon steel sheet is about 700 ℃, and the protective atmosphere in the furnace is strictly controlled to be non oxidizing atmosphere during annealing.
Based on the principle of non oxidation and non carburization of iron core lamination and no obvious deterioration of insulation coating on the surface of electrical steel strip (silicon steel sheet). The best choice is hydrogen nitrogen mixture containing 2-10% hydrogen. The addition of a small amount of hydrogen can ensure that the iron core lamination is not oxidized. The dew point of protective gas should be below 0 ℃.
To produce qualified silicon steel sheet has certain requirements for equipment and process. Xianxian COSCO Electronics Co., Ltd. adopts silicon steel produced by large manufacturers, has a long-term cooperative relationship with Baosteel and Hebei Iron and Steel Group, and reduces the procurement cost to the minimum while ensuring the quality.