The company “Energosteel” produced an experimental batch the 20mm grinding balls of high carbon alloy steel in the end of December 2016. The batch showed higher hardness values throughout cross section of grinding ball with a surface hardness 61-63HRC and volumetric hardness – 59-61 HRC.
According to old national quality standard (DSTU 3499-97) current grinding balls correspond to the 4-th hardness group and according to the new national quality standard (DSTU 8538: 2015) they correspond to the 5-th hardness group.
Grinding balls have been successfully tested for the impact resistance. Thirty balls have been selected from a batch for the experiment. Each selected ball sustained the total impact energy of 64 312 J without destruction.
This batch of grinding balls was successfully shipped for export.