ALLSTAR Group is the leading company in the production & marketing of grinding media in China
Home > Press > Matters needing attention in grinding rod strengthening treatmen

Matters needing attention in grinding rod strengthening treatmen

Views: 459 Update Date:Dec 19 , 2022
When the surface of the grinding rod is strengthened, the following principles should be followed, the maximum hardness difference between the grinding rod should not exceed 1HRC, the following will take you learn more about the things you should pay attention to when strengthening the grinding rod.

1. The hardness value of the surface of the grinding rod increases with time, but after a certain period of time, the increase in hardness is not obvious, and the time is long, the productivity is low, and it is easy to cause cracks on the surface of the grinding rod and damage the extreme difference between the rod and the rod. Therefore, under the premise of ensuring the hardness, the strengthening time should be limited to minimize the range within the rods, and the metallographic structure and crushing load of the grinding rod should be in the best state.

2. The surface hardness of the grinding rod increases rapidly at the beginning of strengthening, and the rod inner range and rod shape range that characterize the hardness uniformity generally increase, reaching the highest point for about 2~4 hours. Then it starts to drop, and the lowest point occurs at about 4-6 hours. This change is related to the diameter of the rod. Generally, the reinforcement greater than 9.525mm takes about 4h, and the reinforcement smaller than 9.25mm takes about 5~6h. The strength uniformity is the best, and the hardness values in both cases also meet the requirements.


3. The effect of strengthening time on the structure of the grinding rod. After heat treatment, the microstructure of the ground rod is martensite and retained austenite. Martensite has dislocation type and twin type. The dislocation type is plate-like and uneven. The twins are flaky and very brittle. After strengthening and breaking, cracks will be induced; the residual austenite is soft and can be partially transformed into martensite after strengthening, but the strengthening time is too long and no longer transforms, and cracks may appear on the surface.

4. The effect of strengthening time on the crushing load of the grinding rod. In the early stage of strengthening, the crushing load of the grinding rod increases rapidly, and then changes slowly or even slightly decreases when the steel is further strengthened. This is because the brittleness of the metal in the surface layer increases, and the strength is weakened by excessive strengthening.
Prev: The best collection of affordable grinding steel and media balls Next: Influence of Grading of Grinding Media on Grinding Effect

Contact Us

  • Office Site: Room 1226, Office Building 5, Longquan International Plaza, No. 1688, Shuangshan Street, Shuangshan Subdistrict, Zhangqiu District, Jinan City, Shandong Province, China
    Factory Site: Taitou Industrial Park, Guanzhuang Town, Zhangqiu District, Jinan City, Shandong Province, China
  • +86 531 83389098
  • allstar@steelgrindingball.com
Facebook Twitter Linkedin Youtube Pinterest
Top