For a long time, some domestic and foreign ferrous metals (iron ore) and nonferrous metal beneficiation industries still use low chromium balls and forged steel balls as grinding bodies. Although some mill ball manufacturers use high chrome balls instead of low chrome balls and forged steel balls to do a lot of work, the quality of their balls is not good enough and their wear resistance is not good (hardness is lower HRC56-59, resistance Grinding only 1.5 times the ordinary low-chromium ball), and sometimes even a lot of crushing balls and so on, in short, that cost is poor, can not bring good economic benefits to users, it has been unable to change the status quo. Practice has proved that the mine ultra-hard high-chromium ball instead of low-chromium ball and forged steel ball use is bound to be a trend, most foreign mines have long been used super-hard high-chromium ball as a grinding body.
In recent years, Ningguo Zhongyi Wear-Resistant Material Co., Ltd. has continuously developed and developed a series of new products (in combination with industry and user working conditions), especially the ultra-hard and high-chromium balls specially used in mines, which are favored by mine users soon after they are put into the market. The product hardness (HRC) up to 63-67, the impact value ≥ 4.0J / ㎝ 2 or more, wear resistance is 2 times the ordinary low-chromium ball, forged steel ball more than 2.2 times (wear resistance is GB / T17445- 2009 national standard high chromium ball 1.5 times); the actual use of the user test broken ball rate ≤ 0.3% (much lower than the national standard and similar business level). In addition, our company has developed products with more than 30% chromium content for export. Due to the low abrasion performance of special high chromium ball for this mine, the grinding efficiency is high, the gradation of steel balls in the mill is not likely to change easily, not only increasing the fineness of ore powder to a certain extent, Production, but also to ensure the quality of ore powder; while lengthening the cycle of supplementing the ball, greatly reducing the labor intensity of workers, in particular, greatly reducing the number of additional ball.