CF8M Stainless Steel Impeller
CF8M is the cast equivalent of 316 stainless. The molybdenum addition is what separates it from CF8 (304), and it is the reason CF8M holds up in chloride-bearing water where plain 304 pits.
It is the default for municipal water, wastewater and general chemical duty. It is not the answer for high-chloride seawater or abrasive slurry — those move you to duplex CD4MCu or a high-chrome iron respectively.
| Standard | ASTM A743 CF8M / EN 1.4408 |
| Equivalent | Cast 316 stainless steel |
| Condition | Solution annealed and passivated |
| Balancing | To the grade agreed on the order (ISO 1940) |
| Certification | EN 10204 3.1 per heat, spectrometer results |
| Construction | Closed, semi-open or open, to your drawing |
What to Send With Your Enquiry
The more of this we get up front, the fewer rounds before a firm price.
| Item | Why it matters |
|---|---|
| Outside diameter | Sets the head at a given speed — the primary duty parameter |
| Bore & keyway | Must match the shaft already in the pump |
| Hub height | Positions the impeller against the casing face and wear rings |
| Vane count & profile | Moves the duty point and the pressure pulsation |
| Rotation direction | A mirrored impeller looks correct and pumps badly |
| Pumped fluid & temperature | Drives the alloy decision more than anything else |
| Quantity | Minimum is 100 pieces; the batch size sets the tooling amortisation |
