Introduction: The grinding ball with chromium content =10%-14%, hrc =58 is popular on current market and also very economic . Chromium content =47, hrc =58 , this kind ball is called special high chromium steel ball High chrome grinding ball issuitable for the industry with high requirement on grinding fine, and high abrasion . High chrome grinding ball can increase production, and reduce consumption obviously in the cement industry. Features: Good toughness, low abrasion, low broken rate of low chromium alloy casting; low chromium ball hardness can reach 50-62hrc z