Centrifugally cast 2–5 mm alloy lining for glass-filled and corrosive resins. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
When a nitrided barrel wears through in eighteen months, the fix is not a harder nitriding cycle — it is a different bore. Our bimetallic barrels are centrifugally cast with a 2–5 mm alloy layer bonded to the steel body, then finish bored and honed.
Typical service life on glass-filled nylon is three to five times that of gas-nitrided steel. We line both new barrels and, where the body is sound, customer-supplied ones.
Quote within one business day. We reply with a matching proposal, delivery date and price — no generic catalogue PDF.
Standard range shown. Every dimension below can be changed to your machine, resin and output — custom manufacturing is our daily business.
| Alloy layer | 2–5 mm, centrifugally cast |
|---|---|
| Alloy type | Fe-based / Ni-based, matched to resin |
| Bore diameter | Ø20–300 mm |
| Bond strength | Metallurgical, no flaking at the interface |
| Bore finish | Honed, Ra 0.4 |
| Typical life gain | 3–5× vs nitrided on filled resin |
| Lead time | 30–45 days |
The honest answer depends on your resin, not on price. Here is how we advise customers.
| Gas Nitrided (38CrMoAlA) | Bimetallic Alloy Lining | |
|---|---|---|
| Best for | Unfilled PE, PP, PS, ABS, virgin PVC | Glass-filled, mineral-filled, recycled, corrosive |
| Surface hardness | HV 900–1020, depth 0.45–0.7 mm | Alloy layer 2–5 mm, metallurgically bonded |
| Typical service life | Baseline | 3–5× baseline on abrasive resin |
| Cost | Lower | Higher, recovered through fewer stoppages |
| Certification | MTC with heat number | MTC + hardness records, third-party on request |
2 mm covers most filled resins; 3–5 mm for heavy glass loading or recycled feedstock. We recommend based on your resin and expected annual output.
If the body is not cracked or oval beyond recovery, yes. Send it in and we measure first — we will tell you honestly if relining is not worth the freight.
Yes, an MTC with heat number and hardness readings ships with every bimetallic barrel. Third-party inspection (SGS / TÜV) can be arranged at your cost.
Complete matched set for 90–450 t injection moulding machines, nitrided or bimetallic.
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High-compression PET screw with barrier tips, low acetaldehyde generation for bottle-grade preforms.
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Three-zone GP screw for PE, PP, PS and ABS with polished flight profile.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
