Abstract:

Effects of Si content and finish rolling temperature (770-920 ℃) on the electromagnetic properties of electromagnetic pure iron for shielding were investigated in order to optimize such properties. The results show that as the Si content increases to 2.0%, the maximum magnetic conductivity increases first and then decreases, and the coercive force is the opposite, while the saturation magnetic induction intensity decreases gradually but the decrease is small. With the increasing final rolling temperature, the [111]component in the hard-to-magnetization direction of the grain first decreases sharply and then increases slowly. The favorable (110)[001]component slowly increases, and the deviation degree first decreases and then increases. The composition and process for the best magnetic properties of the experimental steels are final rolling of electromagnetic pure iron containing 1.4%Si at 840 ℃ and annealing at 1100 ℃, where the maximum magnetic conductivity is 37.84 mH/m, the coercive force is 16.85 A/m, the saturation magnetic induction is 1.80 T, and the shielding effectiveness is 13.92 dB in low-frequency DC magnetic field environment.

Key words: electromagnetic pure iron, Si content, finish rolling temperature, magnetic properties, grain orientation