Rolling balls for iron mine,gold mine,copper mine.Suitable for ball mill that diameter is less than 2500 mm , vertical mill.Material:
choose medium carbon steel, alloy steel, using medium frequency heating rolling process,
to achieve the core and surface hardness consistent

Goldpro rolling balls

Dimensions	Material	Hardness	Izod impact strength	Breakage Rate	Impact to broken (times)
20mm-70mm	GN-1A	60-55HRC	12-35J/CM2;	real 0.5%	20,000
	GN-2A	62-58HRC
	GN-3A	65-59HRC

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C	Si	Mn	S&P	Cr
0.30-0.57	0.17-0.35	0.5-1.8	0.036Max	0.25Max

Usage:grinding media, abrasives
Abrasive Grain Sizes:25mm
roundness:equal or below 2%
Shipping Terms:
Minimum Order Quantity:20 Ton/Tons
Annual output: 200000T
Port:XINGANG OR requirements.
Packaging Details:could be packed in standard ton bags or barrel