n.去磁作用(退磁作用；祛磁效應(yīng))
It shows hard , strong magnetism , stable temperature , uneasy demagnetisation and well anti-causticity .It is widely used in stationeties, motors, speakes and metal detectors, etc. 其材質(zhì)特點(diǎn)是硬而脆，磁性較強(qiáng)，溫度穩(wěn)定性好，不宜退磁，耐腐蝕性好。
