High and low chromium alloyed mini-balls Low chromium alloyed balls, polybasic alloyed casting balls High and low chromium alloyed casting bars Specifications Diameter 16*16 18*18 20*25 20*30 20*35 22*22 25*25 25*30 25*35 30*35 30*40 35*40 35*45 Chemical composition Kinds c SI mn cr mo cu S p Low cr alloy 2.7-3.5 1.0-1.8 0.3-0.8 0.3-1.5 0-0.6 0-0.6 less than 0.15 less than 0.15 High cr alloy 1.7-3.2 0.3-1.2 1.3-2.6 11-16 less than 2 less than 1 less than 0.08 less than 0.1 Mechanical properties Microstructure ak hardness Low cr alloy p+c greater than 2.0 45-50 High cr alloy m+c greater than 3.0 56-62 Low chromium alloyed balls, polybasic alloyed casting balls Low chromium cast grinding balls chemical composition Low chromium cast grinding balls designation chemical composition C SI mn cr mo PS Zqcr 2 2.0-3.3 less than 1.2 less than 1.5 1.0-3.5 less than 1.0 less than 0.15 less than 0.15 Properties and microstructure Low chromium cast grinding balls designation (hrc) ak(j/cm 2) microstructure times of falling balls Polybasic alloyed casting balls chemical composition Name chemical composition(%) C SI mu cr mo cu ni nb ti zr v b p S Polybasic 1 1.8-3.2 0.5-1.5 0.4-1.5 3.5-8 Properties and microstructure Name (hrc) ak(j/cm 2) microstructure times of falling balls Polybasic 1 Polybasic 2 Specification Ball diameter(mm) weight of each ball(kg) pcs/ton 20 0.0322 31056 25 0.063 15873 30 0.11 9091 40 0.257 3 891 50 0.50 2000 60 0.867 1153 70 1.37 729 80 2.05 487 90 2.9 345 100 4.00 250 110 5.3 188 120 6.80 147 125 7.75 129 130 8.74 114
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