Non-Oriented Electrical Steel Sheet with Fine Magnetic Performance, and Calcium Treatment Method Therefor

摘要

A non-oriented electrical steel sheet with fine magnetic performance, and a calcium treatment method therefor, including an RH (Ruhrstahl-Heraeus) refinement step. The RH refinement step sequentially comprises a decarbonization step, an aluminum deoxidation step, and a step of adding calcium alloy. In the step of adding calcium alloy, time when the calcium alloy is added satisfies the following condition: time interval between Al and Ca/total time after ΣAl=0.2-0.8. In this method, production cost is reduced, the production process is simple, a normal processing cycle of RH refinement is not affected, the device is convenient in operation and is controllable, and foreign substances are controllable in both shape and quantities. The non-oriented electrical steel sheet prepared according to the present invention has fine magnetic performance, and the method can be used for mass production of the non-oriented electrical steel sheet with fine magnetic performance.

主权项

1. A calcium treatment method for a non-oriented electrical steel comprising a RH refining process, the RH refining process comprising decarbonization step, aluminum deoxidation step, and calcium alloy addition step in sequence, wherein in the calcium alloy addition step, the time for adding calcium alloy satisfies the following conditions:
time interval between time for Al and time for Ca/ΣTotal time period after time for Al=0.2˜0.8, wherein, the time interval between time for Al and time for Ca is the time interval between the time point for adding aluminum in said aluminum deoxidation step and the time point for adding calcium alloy in said calcium alloy addition step, and the Σtotal time period after time for Al is the time interval between the time point for adding aluminum in said aluminum deoxidation step and the end point of the RH refining process.