Blow Bars: Which Metallurgy Is Right for You?

Aug 4, 2015

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Blow bars are a critical part when it comes to crushing with Horizontal Shaft Impactors (HSI). Whether you call them breaker bars, blow bars, hammers or impact hammers, they are all the same.  They impart the energy into the material and accelerate it into the curtain or apron, causing the shattering and crushing of the material.

Unless you’re crushing Styrofoam, what metal you use matters. Some are better for highly abrasive materials while other are better suited for materials filled with rebar. Choosing the wrong bar for your application can mean decreased production, frequent bar replacements and increased parts cost from frequent replacements. All this would mean less material produced and less profit for you.

The 4 major types of blow bars are high chrome, medium chrome, low chrome and hybrid alloy.

High Chrome – This bar metallurgy is what you would likely want to select if you plan or crushing asphalt or another highly abrasive feed material. However you do need to ensure feed size is kept down as well as insuring large and medium-sized rebar is kept out of the feed. Introducing too much steel or steel that is too large can cause the bar the fracture.

Medium Chrome – This is a bar that you would probably want to select if you plan on crushing a variety of feed materials over the course of the bar’s life. This type of bar handles relatively large feed sized when compared to the impactor’s feed opening. It can also handle most steel contaminants without issue. This bar can do some work in asphalt but is not a good choice for large Reclaimed Asphalt Pavement (RAP) jobs.

Low Chrome – This is the bar you would likely select if you expect to do primarily concrete, demolition and aggregate jobs. This bar stands up to very large feed materials as well as feed that is heavily contaminated with steel and rebar. This bar will not handle highly abrasive materials well, however.

Hybrid Alloy – This unique alloy is similar to a high chrome bar and would be a good fit for operators who are crushing materials that are abrasive, such as asphalt, but may need the ability to handle larger feed sizes. This bar can also work for operators who may need to crush concrete or light aggregates on occasion. Steel and rebar should be removed, especially if large, or limited when feeding using hybrid alloy bars.

These bars fit the needs of nearly all operators, but special jobs may require special metallurgy bars. Eagle Crusher’s parts and engineering departments can work with you to determine the best bar for you application.

Contact Eagle Crusher today to discuss what blow bar is the best fit for your operation.

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Previous Posts

Which Blow Bars Are Right For You?

Which blow bars are right for your job? Blow bars are thick slabs of metal, typically some mixture of chrome, that are cast for the purpose of effectively breaking apart material like asphalt, concrete, limestone, etc. Often in sets of 3 or 4, blow bars are inserted...

Mobile Vs Portable Rock Crushers: The Pros and Cons

Mobile Vs Portable Rock Crushers: The Pros and Cons We all know that different material processing jobs present unique challenges and with the current world market, buying the right crushing equipment is critical to keeping your company up and crushing. One of the...

Staying Safe During Warm Weather Crushing

Staying Safe During Warm Weather Crushing As the summer months roll in, bringing higher temperatures and more sun exposure with it, operating portable crushing and screening plants at outdoor locations can become more demanding and introduce new safety hazards to team...

Why It Is Important To Have Critical Spares On Hand

Why It Is Important To Have Critical Spares On Hand Downtime is the enemy to productivity when you have a job to do, so you want to be prepared by keeping critical spares on hand. Having critical spares on hand allows for the minimal downtime of replacing the part in...

What Are Crushers?

What Are Crushers? Crushers are machines designed to reduce large materials, typically rocks, concrete or asphalt, into smaller materials for purposes of sizing, recycling, reduction, and more. These crushers are typically found in quarries, mines, recycling...

Eagle Crusher at World of Asphalt / AGG1 2022

Did you miss Eagle Crusher at World of Asphalt / AGG1? No worries, we’ve got you covered. Eagle Crusher was one of the 440 companies showing at the record-breaking World of Asphalt / AGG1 in Nashville, Tennessee this year. With over 11,000 attendees, Eagle Crusher was...

How To Startup Your Crushing Equipment This Spring

How To Startup Your Eagle Crusher Crushing Equipment This Spring Now that Spring is officially here, that means warmer temperatures to help with the startup of the plants that were inactive over the winter. Your service manuals and vendor books have more detailed...

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All you need to know about the UltraMax® 69X in one place. From horizontal shaft impactors to jaw crushers, Eagle Crusher manufactures some of the toughest and most powerful crushing equipment on the market, empowering producers to conquer any size crushing project....

Why Choose Eagle Crusher?

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Introducing the RapiDeploy® 1000

At Eagle Crusher, we pride ourselves in developing products that meet our customers needs. That’s why we’ve taken our popular RapiDeploy® 500 plant and enlarged it: Introducing the RapiDeploy® 1000 The RapiDeploy® 1000 features our powerful Ultramax® UM-15 impactor...

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