In heavy industries such as mining, building materials, and metallurgy, the crushing of high-hardness materials (such as granite, basalt, iron ore, etc., with a Mohs hardness of 5-7 or higher) places extremely high requirements on the impact resistance and wear resistance of the core component of the crusher—the impact block.
Many users face a common problem: ordinary material impact blocks wear quickly and need frequent replacement; high-hardness cast iron materials, although wear-resistant, are brittle and prone to chipping and damaging the main machine. When dealing with high-hardness materials, choosing the right impact block material is the key to reducing costs and improving production line efficiency.
A large number of engineering practices have proved that under high-hardness and high-impact working conditions, the modified high-manganese steel series (Mn13Cr2, Mn18Cr2) is the optimal choice for impact blocks. Its core advantage is balancing “hardness and toughness”, achieving “hard surface and tough core, and harder with more impact”, which perfectly adapts to the crushing needs of high-hardness materials.
When crushing high-hardness materials, three major tests are imposed on the impact block: first, high impact load, which may cause the component to chip when materials hit at high speed; second, severe abrasive wear, where sharp particles continuously cut the working surface; third, complex stress fatigue, where repeated impacts are likely to produce cracks and spalling. This requires the impact block to be based on toughness, while taking into account hardness and fatigue resistance, both of which are indispensable.
Modified high-manganese steel is optimized by adding alloying elements such as chromium, molybdenum, and vanadium on the basis of traditional high-manganese steel. It retains the “work hardening” characteristic of classic high-manganese steel—after water toughening treatment, the initial hardness is HB200-250, with tough texture. Under high impact, the surface hardness quickly increases to above HB500, forming a hard wear-resistant layer, while the interior maintains a high-toughness matrix to absorb impact and prevent fracture.
The applicable scenarios of the two mainstream modified high-manganese steels are clear: Mn13Cr2 is a general choice for high-hardness materials. By adding 2% chromium on the basis of Mn13, the work hardening speed is faster, and the wear resistance is 30%-50% higher than that of ordinary Mn13. It has excellent toughness and is suitable for medium and high-intensity impact working conditions such as granite and basalt; Mn18Cr2 is a top configuration for extreme working conditions, with manganese content increased to 18%, stronger impact toughness, and wear resistance 2-3 times that of ordinary Mn13, suitable for easy chipping scenarios such as extra-large hard materials and high-stress extrusion.
High-chromium cast iron, commonly used in the industry, although high in hardness and wear resistance, has poor toughness and brittleness, and is prone to fracture under high impact. It is only suitable for medium and low impact and high wear scenarios, and cannot adapt to the high impact needs of high-hardness materials. In contrast, modified high-manganese steel has far superior toughness, and the greater the impact, the more sufficient the hardening, making it more secure in terms of safety and service life.
The selection suggestions can be summarized as follows: choose Mn13Cr2 for medium and high-hardness materials (such as limestone, slag) for the best cost performance; choose Mn18Cr2 for ultra-high-hardness materials (such as silica, iron ore) or high-impact working conditions for longer service life. At the same time, it should be noted that the impact block must undergo standard water toughening treatment, be installed firmly, and inspected regularly to give full play to its impact resistance and wear resistance advantages.
Choosing the right impact block material can greatly extend the service life, reduce the frequency of shutdown and part replacement, and lower the costs of labor and main machine loss. With excellent comprehensive performance, modified high-manganese steel Mn13Cr2 and Mn18Cr2 have become the mainstream choice for high-hardness material crushing scenarios, providing users with stable and economical wear-resistant solutions.
SHANVIM as a global supplier of crusher wearing parts, we manufacture cone crusher wearing parts for different brands of crushers. We have more than 20 years of history in the field of CRUSHER WEAR PARTS. Since 2010, we have exported to America, Europe, Africa and other countries in the world.
Post time: Mar-05-2026