blow bar crusher

• How to choose the correct blow bar material?

  Sep 25, 2025

  Choosing the wrong crusher blow bars material will have a series of serious negative impacts on the operation and economic benefits of an impact crusher. So, how should we choose the correct material for impact crusher parts?   1. High-manganese steels: MN13CR2, MN18R2, and MN22CR2. Mn steel offers advantages in wear resistance and toughness, but its wear resistance is not as good as high-chromium steels.   2. High-chromium steels: CR22 or Cr26. Cr steel offers advantages in wear resistance, but its disadvantage is that it makes the blow hammer brittle (poor toughness), unable to absorb impact energy during crushing and prone to breakage.   Impacts: Secondary Equipment Damage: Broken hammer fragments fly at high speed, potentially damaging the crusher liner, impact frame, and even the rotor, resulting in high repair costs and extended downtime.   Safety Hazards: Flying fragments pose a serious safety hazard, potentially harming equipment and personnel.   3. Materials with added Mo include: CR27MO0.5, CR27MO1, and CR27MO2.  The advantage of Mo is that it increases microstructure and toughness, but it comes at a high price.   4. Other Materials: Depending on the application environment and requirements, titanium carbide, ceramics, and other materials can also be added to extend service life. Although relatively expensive, the overall cost-effectiveness is significant. Different Heat Treatment:       How to interpret the material report provided by the manufacturer? In addition to ensuring that the main material components, such as Mn and Cr, match the quoted value, the lower the P and S values, the better; these are considered impurities.   Common Misconception: Higher hardness is not always better. For applications involving high impact and hard materials (such as granite crushing), sufficient toughness (e.g., using high-toughness alloy steel) is crucial. For applications involving high abrasiveness but low impact (e.g., limestone crushing), a higher hardness (e.g., using high-chromium cast iron) is recommended.   The correct selection method: Provide accurate information: Provide ONA Casting with the crusher model, material type, hardness, feed size, and expected output. ONA's professional engineers can recommend the most suitable material, such as high-chromium cast iron, high-manganese steel, and alloy steel.   If price is the only consideration, the savings in blow bars purchase costs may far outweigh the significant losses caused by frequent downtime, equipment damage, and reduced production.   Therefore, choosing the right material is crucial.   Some blow bars suit to Metso: NP1007: 7062251011 NP1110: 7062251250 NP1213: 7062252506 NP1315: 7062252760 NP1520: 7062255000 Z036: MM0230680 NP1315/1415 PN: 7062252760 NP1213 Suit to Metso Nordberg. APS4054 PN: APS4054F.2.1B-2 Suit to Sandvik Original Dimensions Inlaid ceramics Increase using life.  

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