Used for secondary crushing and shaping. Blow bars and impact liners face high-speed impact wear; high-chromium iron and ceramic composites are selected for the feed abrasiveness.
In an impact crusher, blow bars on a high-speed rotor strike the feed. Material then impacts the first, second and optional third apron liners, as well as other particles. Wear is concentrated in four main systems:
Explore part names, images, material options and technical requirements. Select a card to open the corresponding replacement part page.
Blow Bar
Blow Bar Retaining Wedge
Blow Bar Backing Bar
Rotor Assembly
Rotor Protection Liner
Rotor Shaft
Rotor Bearing
Rotor Bearing Seal
First Apron Liner
Second Apron Liner
Third Apron Liner
Side Liner
Feed Liner
Impact Apron Assembly
Apron Pivot Pin and Bushing
Bearing Housing
Materials for similarly named parts may differ by OEM, machine model and operating conditions. Confirm the machine model, OEM drawing number and measured dimensions before ordering or manufacture.
| Material Family | Typical Property Range | Recommended Operating Conditions | Main Limitations |
|---|---|---|---|
| Manganese Steel | Typical initial hardness of approximately 180–240 HB; relies on work hardening under impact | Large feed and high impact, with potential tramp material | May not work-harden sufficiently with low impact or fine feed |
| Martensitic Steel | Commonly around 45–55 HRC, balancing hardness with some toughness | Medium to high abrasion with moderate impact | Control heat treatment, hardness gradients in thick sections and residual stresses |
| High-Chromium White Cast Iron | Working layer commonly around 58–65 HRC | Low to moderate impact and high abrasion with relatively fine, consistent feed | Greater brittleness; unsuitable for heavy lump impact or frequent tramp metal |
| Ceramic / MMC Composites | Hard particles provide abrasion resistance while the steel or iron matrix carries the load | Stable, highly abrasive duties where longer wear life offers significant value | Validate insert placement, bonding quality, impact limits and recycling risks |
1. Provide the equipment OEM, model, serial number, rotor diameter and width, blow bar pocket dimensions, part numbers and used-part photos. 2. Weigh and match blow bars as a set. Metso NP replacement guidance permits a mass difference of up to 2% between opposed blow bars; follow the balancing specification for other brands. 3. Record composition, heat-treatment batch, hardness distribution, nondestructive test results and individual mass for bars, liners and wedges. 4. After rotor repair, check dimensions, weld NDT and static/dynamic balance; do not use hardfacing to conceal structural cracks. 5. Check shaft and housing concentricity, journal fits, tolerances, seal grooves and lubrication passages. 6. Specify the ceramic type, volume fraction or arrangement, matrix grade, bonding method, impact restrictions and site monitoring criteria for ceramic composites. 7. Clean and inspect wedges, support surfaces and locking parts during replacement. Worn wedges increase the risk of loose or broken blow bars.
Provide the machine model, operating conditions and target service life so our engineers can recommend materials and prepare a quotation.
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