sintered Nd-Fe-B, cast and sintered AlNiCo and sintered SmCo (SmCo5, Sm2Co17) of four series widely which are used in aviation of electroacoustics, instruments, computer, electronics and other extending fields. Especially, the grade of sintered Nd-Fe-B covers N35, N38, N40, N50, 30H, 33H, 35H, 45H, 30SH, 33SH, 45SH, 27UH, 38UH, 38EH and so on. Many high-tech enterprises like these produces very much.