Forged grinding steel balls
	C	Si	Mn	P	S	Cr	HRC
60M orged grinding ball	0.55-0.65	0.17-0.37	0.7-1.0	0.04max	0.04 max	0.25max	52-60
65M orged grinding ball	0.62-0.70	0.17-0.37	0.9-1.2	0.035max	0.035max	0.25max	56-63
75MnC orged grinding ball	0.72-0.92	0.17-0.37	0.7-1.0	0.04max	0.04max	0.4-0.6	58-64