... NEW MATERIALS FORGED STEEL BALLS A.SIZE:40-150MM B.CHEMICALELEMENTS:C:0.7-0.9,SI:0.45-0. ... 64HRC57-61FOB$700-1000QINGDAODIA110-140MMHRC55-60HRC52-58FOB$700-1000QINGDAO C.CHEMICALELEMENTS:C:0.72-0.82,SI:0.17-0. ... 37,MN:0.7-0.8,P:0.035MAX,S:0 ... ,MN:0.6-0.12,P:0.035MAX,S:0.035MAX,CR:0.04 B TYPESIZE:60-90MM,3-6MHARDNESS ... :45-55CHEMICALELEMENTS:C:0.72-0.82,SI:0.17-0.37,MN:0.7-0.8,P:0.035MAX ...