Grinding Steel Ball Manufacturers Forged Grinding Ball . Chromium alloy is the main composition of casting steel ball with diameter of 6 mm to 140 mm. According to different chromium content the grinding ball can be divided into three kinds namely low medium and high chromium balls. The hardness of relevant balls are HRC≥45 HRC≥50 and HRC≥58 respectively with diameter of 6 mm to .
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