Let’s discuss what the hardness of the steel rods in rod mills is

Steel rods for rod mills in coal grinding systems, HRC 45–55

Is this a mandatory requirement for purchasing steel bars?

We use 65 manganese steel with diameters of 50, 65, and 75 millimeters. I’m not sure what materials other companies choose; which brand do they opt for? We choose Shandong Iron and Steel

4# lovemylife, how are the situations with the broken steel rods of yours, those rated at 50? Is it serious?

Our steel rods had been in use in the grinder for about half a month when it was discovered that over 50 of them had broken, most of them being size 50

This post was last edited by GSP on 2014-10-13 at 16:35. Analysis of the broken rod phenomenon: (1) Causes: A. Material: internal porosity. Regarding the issues with steel billets in steel mills, only very large-scale mills are able to meet the stringent technical requirements involved, especially for those with a diameter of over 70 mm. While most steel mills can produce billets of this type, their compression ratio and hardenability are low, meaning that their microstructure is not dense enough. B. Process: The internal internal stress has not been relieved. Bar breakage is like an explosion, occurring from within; the process of producing steel bars in steel mills is similar to inflating a balloon – it is necessary to relieve the internal stresses in order to prevent bar breakage. (2) Solution: A. Focus on the materials. a. Try to use materials from **super-large steel mills** ； b. The new alloy material developed by our company was specifically created by industry experts in wear resistance from Tsinghua University and Dalian University of Technology, taking into account the conditions under which rod mills operate. It possesses excellent hardenability, and is produced by a **very large steel manufacturer (under a confidential agreement). B. Processing technology: The steel rod processing technology developed by our company has been granted a **patent**; it significantly improves the wear resistance of the steel rods, and breakage does not occur (we will replace them free of charge if they break). C. The size specifications can be adjusted flexibly; generally, the steel bars supplied by steel mills are 6 meters long. If you use 4-meter long bars, then the 2 meters that remain will be wasted. Our company can produce bars to custom lengths. D. The wear-resistant steel rods produced by our company using new materials and processes extend their service life, reduce costs, and lessen the workload on workers. Don’t worry about stopping the mill and adding steel rods every day – it even **increases production**.

It should be a necessary item; the hardness of steel rods varies greatly, ranging from HRC 10 to 55. It depends on the hardness of the material being ground