磁粉是磁力探伤必需的材料。过去,主要是依靠进口或各单位自行制造。按照自力更生方针,为填补缺门,满足磁性探伤单位的需要,我厂采用了新的化学反应工艺,试验成功了黑色、灰色、红色、棕色、橙色等色彩的探伤磁粉,并投入了生产。这些磁粉的磁性已达到10克以上,细度达到300 Magnetic particle testing is necessary for magnetic materials. In the past, it mainly relied on imports or the manufacture of various units. In accordance with the principle of self-reliance, in order to fill the gap and meet the needs of magnetic testing units, our factory adopted a new chemical reaction process and succeeded in testing magnetic particles of black, gray, red, brown and orange colors and put them into production. These magnetic powder has reached more than 10 grams of magnetic, fineness of 300