Full alloy range from one supplier
High chrome, martensitic and manganese steel bars in the same profile, so you can trial grades without changing supplier.
Crusher Wear Parts
HSI Impactor Blow Bars
Bars for horizontal shaft impactors across the common rotor designs, in the full range of wear alloys.
Overview
About hsi impactor blow bars
Horizontal shaft impactors do their crushing by throwing material against the blow bar and then against the impact aprons. The bar therefore takes the initial strike, and its alloy sets both the wear life and how the machine behaves when something uncrushable arrives.
Melco casts HSI blow bars across the full alloy range: high chrome for abrasive clean rock, martensitic steel for mixed duty, austenitic manganese for high impact and recycling work. Bars are supplied in weight-matched sets so the rotor stays balanced.
We work from OEM drawings, customer drawings or a physical sample. Where a customer is unsure which alloy to run, we normally suggest trialling two grades on the same machine and comparing tonnes per set.
Applications
- Horizontal shaft impact crushers, primary and secondary
- Aggregate, limestone and hard rock crushing
- Recycled concrete and asphalt processing
- Mobile and track-mounted impactor spreads
Features
What you get
Weight-matched sets
Bars weighed and paired before dispatch to keep the rotor in balance.
Section-appropriate heat treatment
Cycle chosen for the actual section thickness, so properties hold through the bar rather than only at the surface.
Full test documentation
Chemical analysis, hardness and dimensional report supplied per heat.
Specifications
Manufacturing specification
Applies to hsi impactor 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 A532 Cl. II Type B (15Cr-3Mo) | 14–18% Cr, 2.5–3.5% Mo, 2.4–3.0% C | 58–64 HRC | General high-abrasion impact crushing |
| ASTM A532 Cl. II Type D (20Cr-Mo) | 18–23% Cr, 1.5% Mo max, 2.0–3.3% C | 58–63 HRC | Abrasive limestone and secondary duty |
| ASTM A532 Cl. III Type A (25Cr) | 23–30% Cr, 1.5% Mo max, 2.0–3.3% C | 56–62 HRC | Highest abrasion, corrosive or wet feed |
| 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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Mounting profile: the face that decides whether a bar seats square. -
High chrome bars after fettling, before dimensional check. -
Weight-matched set strapped for container loading.
Questions
HSI Impactor Blow Bars: common questions
How many blow bars does an HSI rotor take?
Most horizontal shaft impactors run three, four or six bars depending on rotor design and duty. Fewer, heavier bars suit primary crushing; more bars give a finer product and steadier load.
How do I get more tonnes from a set of blow bars?
Three things matter most: matching the alloy to the feed, turning the bars at the right point rather than running them to destruction, and keeping the apron gap set to the manufacturer figure. A worn apron setting pushes far more work onto the bars.
Can blow bars be turned and reused?
Most symmetrical designs can be rotated once to present a fresh face, which typically recovers a substantial share of the original life. Turn them before the wear reaches the mounting area.
Do you supply matched sets or individual bars?
We supply matched sets as standard, because mixing wear states unbalances the rotor. Individual bars are available where you are replacing a single damaged casting from a recent set.
More from our range
Related products
Enquiry
Enquire about hsi impactor 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.