1.The chemical composition range of the steel rod which are used for rolling steel ball.
Usually carbon steel and alloy steel are used for rolling steel ball, Main chemical composition as following：less than C 1.00%，Mn less than 1.50%，less than Si1.00%，less than P and S 0.025%，less than Ni 0.30% ，less than Cr 1 .30%，less than V 0.15%.
2. Compression ratio of the steel rod which are after rolling.
Dia of steel rod 65-110mm compression ratio 14
Dia of steel rod 20-60mm compression ratio 12
Dia of steel rod 110-130mm compression ratio 17
Dia of steel rod 130-150mm compression ratio 17
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