high chrome and low chrome casting steel ball, diameter:17-170mm,no breakage, even wearing, no wearing,adn high ... .0,mn:0.5-1.5,cr:22-30,mo:0-1.0,cu:0-2.0,ni:0-1.5,p:<0.10,s<0.06middle chrome casting steel ball ... :c:2.1-3.2,si:0.5 ... ,cr:7-15,mo:0-1.0,cu:0-0.8,ni:0-1.5,p:<0.10,s<0.06low chrome casting steel ball:c:2.2-3 ...