Mining & CrushersImpact Crusher / Hammer Mill
Blow bar (impact crusher rotor bar)
Most common replacement part in impact crushers – high wear rate. Blow bar weight: 10–200 kg. Cr content drives hardness: 27%Cr = ~650 HBN. Match material to feed: Mn for soft high-impact feed; Hi-Cr for hard abrasive rock. Balance weight within set of bars critical.
Specifications
Material
Hadfield Mn steel Mn14Cr2 (high impact, softer material); 27%Cr Hi-Chrome White Iron (high abrasion, harder rock); Martensitic white iron Cr15MoNi (balanced)
Grades
Mn14Cr2
Material Class
HadfieldWhite IronMn SteelHi-Chrome
Service Conditions
abrasionimpact loading
Common Processes
Sand casting (green or resin); solution anneal (Mn) / heat treat (white iron: destabilise & temper for 600–700 HBN)
NDT & Inspection
Chemical analysis; hardness (white iron: ≥580 HBN; Mn: post-work hardening 250–500 HV); microstructure; dimensional; Charpy impact (Mn); VT
Typical Specs & Notes
Most common replacement part in impact crushers – high wear rate. Blow bar weight: 10–200 kg. Cr content drives hardness: 27%Cr = ~650 HBN. Match material to feed: Mn for soft high-impact feed; Hi-Cr for hard abrasive rock. Balance weight within set of bars critical.
⚠ Caveats
Balance weight within set of bars critical.