... other medium.· Speciality It is magnetic, it must be plated when it is out of surface,it can ... be plated with zinc,glod,nickle,chrome and so on.The frictional resistance is strong,the HRC is ... rolling, and the magnetism can be taken out, HRC≤26.It has good antirust and anticorrosive ... Steel BallsApplied Are 316 stainless steel ball is used in many special industry as iatrical ...