The main document, that regulates the quality of steel grinding balls produced by Energosteel Company, is the standard DSTU 8538:2015.
We have repeatedly informed our readers about this standard in the News section, as well as of any changes made to this document. Thus, in DSTU 8538:2015, compared to the previous version, DSTU 3499-97, the 5 hardness grade of grinding balls was significantly underestimated. However, change#3 «returns» the improved quality characteristics of grinding balls to standard.
The change#3 was adopted by Order 87 of 11.03.2021 and entered into force on 01.07.2021. What gives us this change#3 to DSTU 8538:2015? First of all, the quality improvement of our products – this is where the 6th hardness grade of grinding balls appeared!
Table 2a, which indicates the hardness of grinding balls with high surface and volumetric hardness, supplements the standard.
Table 2a
| Nominal diameter of balls, mm | Grade hardness of grinding balls | |
| 6 | ||
| Hardness HRC / HBW, not less than | ||
| Surface hardness | Volumetric hardness | |
| From 15 to 55 inclusive | 65/653 | 64/640 |
| 60-70 | 60/590 | 58/567 |
| 80-100 | 58/567 | 55/534 |
| 110-120 | 56/545 | 50/477 |
What is also important, in this change, amendments were made to section 7:
“Grinding balls are fire, explosion and radiation safety products that do not harm human health and do not pollute the environment.”
We are sure that our customers together with us will only be glad of this news, because the improved quality characteristics of 6th hardness grade of grinding balls produced by Energosteel, which are characterized by equally high hardness on the full grinding ball – from the surface to the center, can reduce wear (%) to minimum values.