A cast bronze bushing may begin as an individual centrifugal casting or as a section cut from continuous cast bronze tube. Both routes can produce reliable parts, but they create different blanks and suit different dimensions, quantities, and machining plans.
At JEDBUSHING, centrifugal casting is the primary route for custom cylindrical, large-diameter, and thick-wall bushings. Horizontal continuous casting produces bronze tubes and hollow bars that can be supplied as blanks or machined into bushings. Neither method is automatically better; the choice depends on geometry, alloy, quantity, machining allowance, and inspection requirements.
How the Two Casting Routes Produce Different Bronze Blanks
Centrifugal Casting Produces Individual Hollow Blanks
In centrifugal casting, molten bronze enters a rotating cylindrical mold and solidifies against the mold wall, creating a hollow round casting. The bore, OD, faces, flange, grooves, and other features are then machined to the approved drawing. Adequate stock must remain for surface cleanup and dimensional control.
Because each cycle produces an individual blank, centrifugal cast bronze suits custom sizes, replacement parts, small batches, thick walls, and large diameters. It can also avoid removing the center of a large solid bar when the finished component is hollow.
Continuous Casting Produces Long Tubes and Bars
In continuous casting, molten alloy enters a cooled die and the solidifying section is withdrawn continuously. The output maintains one cross-section along its length and is supplied as rod, bar, tube, hollow bar, or another simple shape.
A continuous cast bronze bushing is normally machined rather than cast as one finished part. Material is cut from a continuous cast bronze tube and then turned, bored, faced, drilled, or grooved. This is efficient when a suitable section is available or several bushings share the same starting ID and OD.
Key Differences for Bronze Bushing Production
The casting route affects how the blank is ordered, how much metal must be removed, and how easily the blank matches the finished part.
| Factor | Centrifugal cast bronze | Continuous cast bronze |
|---|---|---|
| Initial form | Individual hollow sleeve or ring | Long tube, hollow bar, solid bar, or fixed section |
| Best-matched geometry | Custom cylindrical parts, large rings, thick-wall sleeves | Parts cut from one constant cross-section |
| Typical order pattern | One-off, replacement, or small-to-medium custom batches | Repeated parts or semi-finished tube requirements |
| Size direction | Better suited to large-diameter hollow parts | Limited by the available continuous-cast section |
| Machining plan | ID, OD, faces, flanges, and details machined from one casting | Material is cut to length and then finish machined |
| Material utilization | Avoids boring a large hollow part from solid stock | Efficient when the available tube closely matches the part |
| Possible delivery | Rough casting, machined blank, or finished bushing | Full tube, cut blank, or finished bushing |
Casting method alone is not a quality grade. Centrifugal casting does not eliminate every possible discontinuity, and continuous casting does not guarantee identical properties in every alloy and section. Chemistry, process control, section thickness, machining location, and acceptance criteria still matter.
M02 generally identifies the as-centrifugal-cast condition, while M07 identifies the as-continuous-cast condition. ASTM B271/B271M covers copper-base alloy centrifugal castings; ASTM B505/B505M covers continuous cast copper-alloy rod, bar, tube, and shapes. A UNS alloy number does not replace the required casting condition or purchase specification. See copper alloy temper designations for the distinction.
Both routes may require chemical analysis, dimensional inspection, property verification, and additional testing when specified. PT, UT, or other examination should be agreed for the part and service requirement, not treated as universal for every bushing.
How JEDBUSHING Selects the Casting Route
JEDBUSHING reviews the finished component before choosing the blank. Our equipment includes cantilever centrifugal casting up to Ø5000 × 1000 mm, roller-type centrifugal casting up to Ø1500 × 3000 mm, and horizontal continuous casting up to Ø400 mm. Feasibility still depends on alloy, wall thickness, weight, tolerance, and inspection requirements.
Centrifugal casting is reviewed first for a large diameter, thick wall, non-standard cylindrical geometry, individual replacement, or hollow part that would waste substantial material if machined from solid stock.
Continuous cast bronze is considered when the alloy and tube section are available, several pieces can be cut from one length, or the customer needs hollow bar or semi-finished blanks.
Quantity alone does not decide the route. One replacement may be economical from available tube, while a repeated order may require centrifugal casting because its dimensions, alloy, or condition do not match tube stock. Parts that are neither rotationally symmetrical nor constant in section may need metal-mold or another casting route.
Send Your Bronze Bushing Drawing for Casting Review
You do not need to select the bronze casting process before requesting a quotation. JEDBUSHING can review whether the part should start as a centrifugal casting, continuous cast bronze tube, or another copper-alloy blank.
Send the finished drawing or available replacement data, including:
- alloy grade and applicable standard;
- finished ID, OD, length, flange, and wall thickness;
- order quantity and repeat-order expectation;
- required casting condition, if specified;
- rough blank, semi-finished, or finished-machined delivery;
- machining allowance, tolerances, and surface requirements;
- material certificates, dimensional reports, or NDT requirements.
We support bronze casting, CNC machining, grooves, holes, CMM inspection, part marking, and export packing. Send your drawing to JEDBUSHING for manufacturing and quotation review.
FAQ About Centrifugal and Continuous Cast Bronze
Can the original casting method be identified from a worn bronze bushing?
Not reliably from appearance alone. Manufacturing records, the original specification, metallographic examination, and other evidence may help, but a replacement route should be confirmed from the required alloy, properties, dimensions, and service conditions.
Can JEDBUSHING supply rough castings or semi-finished blanks for local machining?
Yes. State the required machining allowance, reference surfaces, blank dimensions, inspection points, and whether material or test documents must accompany the blank.
What if an old drawing specifies an obsolete standard or casting condition?
Send the complete drawing without silently replacing the designation. JEDBUSHING can review the old requirement against currently available standards and manufacturing routes, but any material or specification change must be confirmed before production.
Can one project include centrifugal cast parts and continuous cast bronze tubes?
Yes. Different items in one project can follow different manufacturing routes. Drawings, material grades, item numbers, inspection records, and packing marks should keep the parts and their production requirements clearly separated.
