01How the process works
Horizontal machines produce pipes and liners; vertical machines produce rings and short bushings. Rotation speed, pouring rate and mould temperature determine the structure. Light impurities and gas collect at the inner surface, which is machined, leaving a dense wall.
Typical risks are segregation of alloying elements across the wall, insufficient machining of the bore layer and wall thickness variation. For bronze bushings and alloy tubes, chemistry and structure checks matter as much as dimensions.
- Mould preparation. Mould coated and brought to temperature.
- Spinning and pouring. Metal poured at controlled rate into the spinning mould.
- Solidification. Outer wall freezes first; impurities move inward.
- Extraction. Casting removed after cooling.
- Machining and testing. Bore and outside machined; NDT and tests.
02What typically goes wrong
| Defect | Typical cause | How it is found |
|---|---|---|
| Segregation | Rotation speed, cooling rate | Chemistry across wall, hardness profile |
| Bore porosity left after machining | Insufficient stock removal | Visual, PT on bore |
| Wall thickness variation | Eccentric mould, pour rate | UT thickness mapping |
| Banding | Speed fluctuation | Macro etch |
| Cracks | Mould coating, cooling stress | PT, UT |
| Wrong alloy | Mixed scrap or ingots | PMI, chemistry |
03Where an inspector should look
01
Before production
- Alloy specification and machining allowance
- Speed and temperature parameters
- Test ring or coupon plan
02
During production
- Rotation speed records
- Pour temperature
- Coating thickness
03
After production
- Wall thickness by UT
- PT on bore
- Chemistry and mechanical tests
04Standards and references
EN 1982 (copper alloy castings), ASTM A351 and A426 for centrifugally cast pipes, customer bore porosity criteria.
Standards are named for orientation. The applicable edition and acceptance criteria are those in your contract and specification.
05How we support buyers of centrifugal casting parts
Material Verification and Certificate ReviewMaterial identification, PMI, hardness checks and technical review of EN 10204 certificates against material standards.
Independent Quality ControlIncoming, in-process and final quality control performed independently at the supplier, with measured results and clear acceptance decisions.