The 19-21% manganese cast blow bar is a special wear part used in heavy-duty machinery, especially in impact crushers and mobile crushers. Produced by casting methods, it contains 19% to 21% manganese (Mn). Manganese is one of the most critical alloying elements, giving steel high impact resistance, wear resistance, and long service life.

A higher manganese ratio increases both work hardening capacity and toughness. For this reason, 19-21% manganese blow bars are preferred in crushing very hard stone, granite, basalt, ores, and recycled materials.

2. How Does It Work?

These blow bars are mounted on the rotor of impact crushers. When the crusher operates:

  1. The rotor spins at high speed, throwing material against the blow bars.

  2. The blow bars fracture the material with high impact energy.

  3. The surface of the bar is exposed to continuous wear, but manganese steel has a unique property: the surface hardens under impact (work hardening).

  4. This self-hardening ability ensures long service life without premature breakage or wear.

Thus, these blow bars are not just spare parts, but critical components that directly influence crusher efficiency and operating costs.

3. Application Areas

  • Quarries and Aggregate Production

    • For crushing granite, basalt, limestone, and andesite.

    • Aggregate production for concrete and asphalt.

  • Mining Industry

    • Used in crushing iron ore, copper, gold, chrome, and other hard minerals.

    • Ideal for the first reduction stage of abrasive ores.

  • Recycling Plants

    • Crushing demolition debris, concrete waste, asphalt, and bricks.

    • Recycling of metallic construction waste.

  • Mobile Crushers

    • Highly effective in portable crushing plants.

    • Capable of handling various materials on-site.

  • Heavy Construction

    • Infrastructure projects like road building, dams, ports, and airports.

4. Advantages

  • High Impact Resistance – Withstands extremely abrasive materials.

  • Long Service Life – Reduces downtime and replacement costs.

  • Self-Hardening Surface – Becomes harder under impact.

  • Versatility – Suitable for stone, ores, concrete, asphalt, and recycling.

  • Increased Efficiency – Improves production and reduces stoppages.

5. Disadvantages

  • Higher Price compared to standard alloys.

  • Installation Sensitivity – Incorrect mounting reduces performance.

  • Overkill for Soft Materials, leading to unnecessary costs.

6. Conclusion

The 19-21% manganese cast blow bars are designed for the toughest crushing conditions. With their superior durability, self-hardening property, and wide usage in mining, quarries, and recycling, they provide maximum efficiency and reliability for heavy industries.