According to DSTU 8538:2015, grinding balls 50 HRC after heat treatment should be consistent with the standards shown in table 2 (DSTU 8538:2015), for example, for grinding balls with a nominal diameter of 120 mm, this is at least 50 HRC / 477 HB on the surface. Please note that information about the upper rate is not specified.
The main standards for measuring steel grinding balls 50 HRC, according to the control methods prescribed in DSTU 8538:2015, is to determine only the hardness on the surface on two diametrically opposite sites.
Thus, when production and supply of grinding balls 50 HRC, the testing Energosteel’s laboratory takes measurements only on the balls surface in accordance with the DSTU 8538:2015 standards. However, if the surface of produced grinding balls exceeds the minimum permissible values this does not mean that grinding balls quality does not comply with DSTU 8538:2015, because the upper limit of the norm is not regulated.
