CF8M Stainless Steel Single Screw Pump Rotor Precision Casting

CF8M Stainless Steel Single Screw Pump Rotor Precision Casting

In demanding fluid transfer applications, the rotor is the heart of the screw pump — and its quality determines everything. Our CF8M stainless steel single screw pump rotors are precision cast using the lost-wax investment casting process, delivering the dimensional accuracy, surface integrity, and corrosion resistance required for reliable, long-life operation in chemical, food, pharmaceutical, and marine environments.

Material Properties

• Grade: CF8M (cast equivalent of AISI 316 / 1.4408)
• Tensile Strength: ≥485 MPa
• Yield Strength: ≥170 MPa
• Hardness: ≤217 HB
• Molybdenum Content: 2–3% — significantly enhances resistance to chloride pitting and crevice corrosion
• Corrosion Resistance: Excellent resistance to acids, alkalis, chlorides, and process chemicals
• Temperature Range: Suitable for cryogenic to 870°C service conditions
• Hygienic: Meets requirements for food-grade and pharmaceutical fluid handling

Casting Process & Quality

• Process: Lost-wax investment casting for precise helical rotor geometry
• Dimensional Tolerance: CT4–CT6 per ISO 8062
• Surface Roughness: Ra 1.6–3.2 μm (post-machining/polishing available)
• Helix profile accuracy: Tight pitch and lead tolerances for consistent volumetric efficiency
• Post-processing options: CNC turning, grinding, hard chrome plating, electropolishing, passivation
• Quality inspection: Dimensional check, surface inspection, dye penetrant testing (PT) available

Key Features

• Superior corrosion resistance: CF8M’s molybdenum content provides outstanding protection in chloride-rich and chemically aggressive media
• Precision helix geometry: Accurate rotor profile ensures tight clearance with stator for optimal volumetric efficiency and minimal slip
• Smooth surface finish: Reduces friction, minimizes wear on stator rubber, and improves flow efficiency
• High temperature capability: Maintains dimensional stability and mechanical properties across a wide temperature range
• Low pulsation flow: Precision cast rotor geometry delivers smooth, continuous fluid transfer with minimal pressure fluctuation
• Custom specifications: Rotor diameter, pitch, lead, length, shaft connection, and surface finish per your drawings or samples

Applications

• Chemical and petrochemical process pumps
• Food and beverage transfer (sauces, dairy, beverages)
• Pharmaceutical and biotech fluid handling
• Marine and offshore fluid systems
• Wastewater and sludge transfer
• Oil and gas production and injection systems
• Pulp and paper processing

Custom Order Process

1. Submit your rotor drawing (STEP, DXF, DWG, or PDF) or sample part
2. Receive detailed quotation within 24–48 hours
3. Prototype approval before mass production
4. Lead time: typically 15–30 days depending on complexity and quantity

Ready to discuss your rotor specifications? Contact us for a custom quote — our engineering team is ready to assist.