Built for tramp metal
Manganese and martensitic grades that deform rather than fracture when rebar goes through.
Crusher Wear Parts
Rubble Master & McCloskey Blow Bars
Bars for compact mobile impactors working demolition and recycling feed, where tramp metal is a daily fact.
Overview
About rubble master & mccloskey blow bars
Compact mobile impactors from Rubble Master, McCloskey and Eagle spend much of their life on demolition and recycling sites, crushing reinforced concrete, brick and asphalt. That feed almost always contains rebar and other tramp metal.
For that duty Melco generally recommends austenitic manganese steel or a martensitic grade rather than high chrome. The bar needs to survive a rebar strike without fracturing, and manganese steel deforms where high chrome would break.
We supply these bars in weight-matched sets, palletised and strapped for direct container loading. This is one of our higher-volume export lines.
Applications
- Rubble Master, McCloskey and Eagle mobile impactors
- Reinforced concrete and demolition waste
- Asphalt and road planings recycling
- On-site crushing spreads with mixed feed
- Brick, block and construction waste processing
Features
What you get
Matched sets, palletised
Weight-matched and strapped to heat-treated pallets, ready for container loading.
High-volume export line
Regular production runs mean patterns are already tooled for the common models.
Grade guidance included
We advise on grade for your actual feed rather than shipping a single default alloy.
Specifications
Manufacturing specification
Applies to rubble master & mccloskey blow bars produced at our works. Castings outside this range can usually be accommodated, so please ask.
| Moulding | No-bake resin sand and green sand |
|---|---|
| Melting | Induction furnace, spectrometer-controlled |
| Piece weight | 5 kg – 2,000 kg |
| Heat treatment | In-house, computer-controlled cycles |
| Dimensional control | Template and CMM check against drawing |
| Documentation | Chemical, hardness and dimensional report per heat |
Material grades
| Grade | Typical composition | Hardness | Suited to |
|---|---|---|---|
| ASTM A128 Grade A | 1.05–1.35% C, 11.0–14.0% Mn | 200–229 BHN as-cast, 500+ BHN work-hardened | Standard high-impact duty |
| ASTM A128 Grade B-3 | 0.9–1.05% C, 11.5–14.0% Mn | 200–229 BHN as-cast, 500+ BHN work-hardened | Heavier sections, improved toughness |
| ASTM A128 Grade C | 1.05–1.35% C, 11.5–14.0% Mn, 1.5–2.5% Cr | 220–250 BHN as-cast | Where extra initial hardness is needed |
| Low-alloy martensitic steel | 0.3–0.5% C, Cr-Ni-Mo alloyed | 45–52 HRC | Mixed impact and abrasion |
| Martensitic / manganese composite | Hard martensitic face, austenitic Mn body | 50 HRC face, tough core | Reinforced concrete and recycling |
Composition ranges are quoted against the published standard. Actual analysis for your heat is issued with the castings.
Gallery
From our works
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Export packing: palletised, strapped and heat-number marked. -
Mounting profile: the face that decides whether a bar seats square. -
Stedman-fit bars following heat treatment.
Questions
Rubble Master & McCloskey Blow Bars: common questions
Which alloy is best for crushing reinforced concrete?
Austenitic manganese steel to ASTM A128 is the usual choice. It work-hardens at the wear face while staying tough through the body, so a rebar strike deforms the bar instead of cracking it. A martensitic grade is a reasonable middle ground where the concrete is lightly reinforced.
How long should a set of blow bars last on demolition work?
Life varies far too much with feed, setting and operator practice for a single figure to be meaningful. What we can do is help you benchmark tonnes per set on your own machine and then compare grades against that baseline.
Do you supply for both Rubble Master and McCloskey machines?
Yes, along with Eagle and other compact mobile impactors. Send the machine model and we will confirm the fitment.
Are these original manufacturer parts?
No. These are independently produced replacement wear parts made to fit those machines. Melco Castings is not affiliated with or endorsed by Rubble Master, McCloskey or Eagle.
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Enquiry
Enquire about rubble master & mccloskey blow bars
Tell us the machine, the feed and the quantity. If you have a drawing or photographs of the worn part, mention it and we will send an upload link.
Melco Castings is an independent manufacturer of replacement wear parts. Machine and OEM names are used only to identify the equipment our castings fit. We are not affiliated with, endorsed by, or a distributor for any of these manufacturers.