Cast Iron 9-Blade Sewage Pump Impeller Shell Molding For Centrifugal Pump Fluid Boosting Systems
This Cast Iron Sewage Pump Impeller (9-Blade Centrifugal Type) is a core rotational and fluid-boosting component designed for sewage lift pumps, septic tank drainage pumps, chemical clean water pumps, agricultural irrigation pumps, slurry transfer pumps, and municipal water supply and drainage equipment. Weighing approximately 3.8 kg, it is manufactured by our in-house Shell Molding (Resin Sand Casting) + CNC precision machining process to achieve high strength, precise multi-vane geometry, and reliable dynamic balance under high-speed rotation. The use of grey cast iron HT250 provides an excellent balance of high tensile strength (≥250 MPa), superior wear resistance against abrasive particles in sewage and slurry media, and excellent vibration damping.
Matech's one-stop approach, covering pattern making, shell molding (resin sand) casting, stress relieving heat treatment, CNC machining (vane profiles, hub bore, keyway, balancing surfaces), dynamic balance testing, surface treatment (black oxide / as-cast finish), dimensional inspection, and engineered packing, ensures this impeller offers excellent vane profile accuracy, tight dimensional tolerances on hub bore and mounting interfaces, and a ready-to-install finish — performing reliably in demanding sewage, slurry, and multi-media centrifugal pump applications.
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Custom 9-Vane Centrifugal Impeller | Shell Molding Casting | 3.8kg HT250 High-Flow Rotor for Sewage & Slurry Pumps — Matech
| Specification | Details for This Case | Matech’s Capability / Notes |
| Alloy Grade | HT250 | We work with Gray Cast Iron(HT150, HT200, HT250, HT300),Ductile Cast Iron(QT400-18,QT500-7,QT600-3,QT700-2),Vermicular Graphite Cast Iron(RuT300,RuT400),Alloy Cast Iron(Heat-resistant,Corrosion-resistant grades),with material certification provided |
| Unit Weight | 3.8 kg | We can handle iron casting parts from 0.1 kg ~ 50 kg |
| Overall Dimensions | 300 × 300 × 50 mm | Maximum machining size approximately 1200 × 1000 × 600 mm, subject to drawing confirmation |
| Casting Tolerance | CT7-CT9 （ GB/T 6414） | Achieved via our in-house precise tooling and stable assembly line production process |
| Machining Tolerance | ±0.02mm | Achieved by 3/4/5-axis CNC centers. Tighter tolerances can be discussed,with best achievable tolerance up to 0.005 mm |
| Surface Roughness | Ra 20 μm (unmachined surface) / Ra 1.6 µm (machined surface) | Typical machined surface roughness can reach Ra 0.8–3.2 μm (turning/milling); Ra 0.4–0.8 μm achievable after grinding |
| Min. Wall Thickness | 3mm | We specialize in thin-wall castings; min. 3.0 mm (for iron castings)feasible depending on geometry. |
| Heat Treatment | Artificial Aging Treatment (Stress-Relief Annealing) | Annealing, normalizing available for iron castings |
| Surface Treatment | black oxide / as-cast finish | Options: Sandblasting / Shot Blasting, Painting (Spraying / Dipping),Dacromet Coating,Black Electrophoresis (ED-Coating),Anti-rust Oil etc. Corrosion resistance per your spec. |
| Application | Sewage lift pumps, septic tank discharge pumps, chemical process pumps, agricultural irrigation pumps, slurry transfer pumps, municipal water supply and drainage equipment; core rotating components for fluid pressurization in various types of centrifugal pumps | We serve Mining, automotive, industry equipment, machinery, pump & valve, new energy, etc. |
| MOQ | 1000 pcs | Flexible MOQ, starting from prototype/small batch quantities. |
| Sample Lead Time | 25-40 working days (with new tooling) | Defined upon drawing review. Expedite options available. |
| Production Lead Time | 30-45 working days | Based on order quantity and complexity, confirmed in contract. |
| Drawing Formats | STEP, IGES, X_T, DWG, PDF | We process all standard 2D/3D formats. |
| Customizable | Manufactured according to drawings or samples | Every aspect—material, geometry, tolerance, finish—is built to your design. |
| Certification | ROHS,ISO 9001:2015 | Material certificates, dimensional inspection reports, and PPAP Level 3 documentation available upon request for automotive and critical components |
| Packing | Custom PE foam + plywood crate | Engineered packing designed for your part’s specific fragile/critical areas. |
Customization Options
Every casting project starts with your unique design and requirements. Whether it's iron, steel, or aluminum, we tailor every aspect of the manufacturing process to your exact specifications. Below are the key dimensions you can customize with Matech — your drawing is our only standard.
Material Selection
From aluminum alloy to grey/ductile iron to carbon steel/stainless steel — we pour the alloy your design demands. Custom compositions are welcome. Full material certification included.
Casting Process
Our engineers tailor the most suitable manufacturing process to your specific needs based on your part's geometry, volume, and performance requirements, ensuring the optimal balance between quality and cost.
Dimensional Accuracy & Machining
We machine to your exact tolerances. In-house 3/4/5-axis CNC with custom fixtures. Casting tolerance CT4-CT11, machining tolerance up to ±0.005mm.
Heat Treatment
MATECH provides a full range of heat treatment services, including:Annealing, Normalizing, Quenching, Tempering, Carburizing, Nitriding, Solution Treatment.
Surface Treatment & Coating
Matech support: Sandblasting / Shot Blasting,Chemical Degreasing, Pickling/Passivation, Mechanical Grinding / Polishing, Zinc Plating, Hard Chrome Plating, Electroless Nickel Plating, Anodizing, Dacromet, Powder Coating, Black Oxide, Stainless Steel Passivation.
Testing, Documentation & Packaging
From material certificates to complete customs clearance documents, and from custom pallets to packaging optimized for your product's specific characteristics. Your parts arrive fully documented, well-protected, and ready for immediate use.
Our Advantages
Technical Advantages
Pattern shop, shell molding & resin sand casting lines, CNC machining, heat treatment, and inspection lab — all centralized under one roof. No outsourcing. From base iron melting to finished and coated part, we maintain full control over lead time, quality consistency, and batch traceability.
Before pattern production begins, we provide a detailed DFM report covering solidification behavior, graphite morphology control, gating & riser design, core assembly strategy, and machining allowance optimization. For 9-vane centrifugal impellers like this 3.8 kg HT250 component, we focus on uniform vane spacing to ensure balanced mold filling, vane thickness consistency to prevent casting distortion, and controlled cooling to avoid hard spots at vane roots and hub junctions during machining.
We specialize in geometrically demanding parts with complex vane profiles and multi-core assemblies — such as centrifugal impellers, pump housings, valve bodies, gearboxes, and cylinder heads. Our shell molding process delivers superior surface finish on vane surfaces and excellent dimensional repeatability for high-volume impeller production. We pour a full range of grades — grey iron (HT150–HT350), ductile iron (QT400-18 to QT700-2) — with in-house heat treatment to tailor hardness, strength, and wear resistance to your specification.
Service Advantages-总部接待区 1 拷贝
Material Advantages
We charge carefully proportioned pig iron, steel scrap, and ferroalloys (FeSi, FeMn) into our electric induction furnaces. Carbon equivalent, silicon content, and alloying elements are spectrometer-verified and adjusted in real time before tapping. Precise inoculation practices ensure consistent flake graphite morphology and mechanical properties across every pour — critical for maintaining uniform HT250 wear resistance and machinability across all nine impeller vanes.
Every production batch is identified by a unique heat number. Chemical composition reports, mechanical test records (tensile strength, hardness), metallographic analysis (flake graphite distribution, matrix structure), and heat treatment charts are compiled into a traceable dossier — from furnace charge to finished impeller.
We pour a comprehensive range of grey iron (HT150–HT350), ductile iron (QT400-18 to QT700-2), austempered ductile iron (ADI), Ni-resist, and high-Si-Mo ductile iron. Whether your application demands wear resistance against abrasive slurry, vibration damping for high-speed rotation, or corrosion resistance in aggressive media, we match the grade and heat treatment to your requirements.
Service Advantages
A dedicated project manager oversees the entire process — from design review to final delivery — ensuring efficient communication at every stage and a single point of contact for all technical and commercial matters.
Quotations are typically provided within 24–48 hours. Production progress is updated regularly through photos and production data, with continuous customer feedback collection throughout the project. For rotating pump components, first-article inspection reports including dynamic balance test results and dimensional layout are provided before batch production begins.
Full batch traceability and 24-hour response to quality-related issues ensure reliable post-delivery support. Flexible MOQ with pilot order options available for new impeller projects.
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Contact Us
Contact us now! Our technical team and mechanical engineers are ready to provide one-stop support for your project from requirement review, quotation to delivery.
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E-mail: ma@matechin.com
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Address: 1st Floor, Building 8, No. 868 Xinge Road, Xinqiao Town, Songjiang District, Shanghai, China
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