Eesson manufactures custom precision cast parts according to customer drawings, material specifications and quality requirements. The following values are general reference ranges for preliminary evaluation. Final capability is confirmed after reviewing the drawing, alloy, structure and critical dimensions.
The lost-wax process can reproduce curved surfaces, ribs, bosses, mounting features and detailed external or internal geometry in a single casting. Feasibility depends on metal flow, section transitions and the proposed gating arrangement.
Typical casting tolerance depends on part size, alloy, geometry and feature location. Critical bores, threads, sealing faces and mounting surfaces can be CNC machined when tighter functional tolerances are required.
A wall thickness of approximately 2.5–3 mm is a practical starting point for many stainless and alloy steel castings. Localized thinner areas may be evaluated according to alloy fluidity, surface area and filling conditions.
| Capability | Typical Reference Range |
|---|---|
| Casting Process | Silica sol investment casting |
| Material Types | Stainless steel, carbon steel and alloy steel |
| Typical Part Weight | Approximately 0.05–20 kg, subject to part review |
| Typical Maximum Dimension | Up to approximately 500 mm, depending on shape and alloy |
| Minimum Wall Thickness | Approximately 2.5–3 mm for many designs |
| Typical As-Cast Tolerance | From approximately ±0.10 mm on smaller dimensions; tolerance increases with size and complexity |
| Surface Roughness | Typically Ra 3.2–6.3 μm in the as-cast condition |
| Production Type | Initial samples, pilot batches and repeat production |
| Secondary Operations | Heat treatment, CNC machining, grinding, polishing and finishing |
| Inspection | Material, dimensional, hardness and surface inspection as required |
These ranges are for early project assessment rather than unconditional production guarantees. Tight tolerances, thin sections and large or complex parts are reviewed individually.
The silica sol casting process uses a disposable wax pattern and a ceramic shell to reproduce detailed component geometry. It is suitable for stainless steel and alloy steel parts that require complex shapes, controlled dimensions and relatively smooth as-cast surfaces.
Before tooling, Eesson reviews the drawing to identify wall-thickness changes, machining allowance, sharp transitions, potential distortion and other manufacturing risks.
Process planning then covers wax production, gating, shell building, melting, pouring, heat treatment, machining and inspection. The final route is adjusted to the alloy and functional requirements of the component.
Review the 2D drawing, 3D model, alloy, quantity, critical dimensions and application conditions.
Develop tooling with allowances for wax behavior, metal shrinkage and subsequent machining.
Inject and inspect wax patterns before assembly to control visible defects and dimensional variation.
Attach patterns to the runner system with suitable spacing and orientation for filling and feeding.
Apply silica sol slurry and refractory layers, allowing each layer to dry before the next coating.
Remove the wax from the hardened shell and prepare the ceramic cavity for metal pouring.
Melt the specified alloy and pour it under process conditions selected for the material and geometry.
Remove the ceramic shell, separate individual castings and clean residual shell and gating material.
Complete heat treatment, machining, grinding, polishing or other finishing required by the drawing.
Inspect finished parts against the approved drawing and quality plan before protection and packing.
Material selection affects corrosion resistance, strength, hardness, wear performance, heat resistance, machinability and overall component cost. Eesson produces stainless steel investment casting, carbon steel casting and alloy steel investment casting parts according to customer requirements.
Grades such as 304, 304L, 316 and 316L are commonly considered for corrosion-resistant pump, valve, fitting and general industrial components.
Grades such as 410 and 420 may be selected when heat-treatment response, hardness and wear resistance are more important than maximum corrosion resistance.
Grades such as 17-4PH may be evaluated for components that need a combination of corrosion resistance and higher mechanical strength.
Carbon steels and heat-treatable alloy steels can provide practical strength, machinability, fatigue resistance and wear performance for industrial parts.
| Material Category | Example Grades | General Selection Considerations | Typical Part Types |
|---|---|---|---|
| Austenitic Stainless Steel | 304, 304L, 316, 316L | Corrosion resistance, toughness and general industrial performance | Pump parts, valve components, fittings and equipment parts |
| Martensitic Stainless Steel | 410, 420 | Hardness, wear resistance and heat-treatment response | Mechanical, locking, wear and valve components |
| Precipitation-Hardening Steel | 17-4PH or equivalent | Higher strength combined with corrosion resistance | High-strength industrial and energy components |
| Carbon Steel | Grade selected by drawing or standard | General mechanical strength, machinability and cost balance | Brackets, levers, hardware and machinery parts |
| Alloy Steel | 4140, 42CrMo or equivalent | Strength, fatigue resistance, wear performance and heat treatment | Automotive and heavy-duty mechanical components |
Customers may specify an exact material grade or provide performance requirements. Equivalent grades and final material condition should be confirmed before production.
Investment casting reduces machining allowance, but functional components often require additional operations for critical dimensions, mechanical properties, surface quality or assembly. Eesson can coordinate casting and downstream processing within one project.
Annealing, normalizing, quenching and tempering, solution treatment, aging or stress relieving may be selected according to the alloy and mechanical-property requirements.
Machining can be applied to sealing surfaces, mounting faces, threads, bores, grooves, bearing seats and other critical features.
Gates, flash, sharp edges and localized surface irregularities can be removed according to drawing and handling requirements.
Shot blasting or comparable cleaning processes can remove residual ceramic material, scale and surface contamination.
Mechanical polishing, passivation, painting, plating or other finishing can be evaluated according to the alloy and service environment.
Where required, castings may be combined with machined parts, fasteners, pins, bushings or other purchased components before final inspection.
Quality control begins with drawing review and material confirmation, not only final inspection. Inspection items are selected according to part function, alloy, dimensional tolerances, surface requirements and the agreed quality plan.
Chemical composition, material certificates and heat-treatment records as required.
Wax pattern, shell condition, pouring, heat treatment and first-piece machining checks.
Calipers, micrometers, gauges, fixtures, optical measurement or CMM as appropriate.
Dimensional, hardness, material or non-destructive testing reports by agreement.
Finished castings can be checked against the approved drawing, datum system and critical feature requirements. Visual inspection and roughness measurement may be included when surface acceptance criteria are defined.
Hardness testing can help verify material condition and heat-treatment results. Tensile, metallographic or other mechanical testing may be arranged where required.
Dye penetrant, magnetic particle, ultrasonic or X-ray inspection may be selected according to material, component function, defect risk and the specified acceptance standard.
Available documentation can be discussed before quotation, including material records, dimensional reports, hardness reports, heat-treatment certificates and third-party reports.
Precision investment casting is suitable for metal components with complex geometry, detailed surfaces or material requirements that would otherwise require extensive fabrication, machining or multi-part assembly.
Valve bodies, discs, pump components, impellers, flow-control parts and fittings with corrosion-resistant alloys and machined sealing surfaces.
Brackets, levers, housings, linkages, forks, mounting parts and wear-resistant components for industrial equipment.
Mechanical levers, locking components, brackets, linkages and other parts requiring consistent geometry and controlled material properties.
Flow-control, pump, valve, bracket and high-strength mechanical components exposed to pressure, corrosion, temperature or load.
Precision brackets, equipment housings, mounting bases, linkages and control-system components with detailed structural features.
Drawing-based OEM components combining casting, heat treatment, machining, surface finishing and final inspection.
Each custom investment casting project follows a structured development process so that technical risks, tooling, inspection requirements and delivery expectations can be reviewed before batch production.
Provide drawings, 3D files, alloy, quantity, tolerances, finishing and application information.
Evaluate wall thickness, transitions, machining allowance, potential distortion and casting risks.
Confirm tooling, unit price, sample quantity, secondary operations, inspection and schedule.
Manufacture tooling and inspect initial wax patterns after technical and commercial approval.
Produce samples using the agreed alloy, casting route, heat treatment and finishing operations.
Inspect against the drawing and complete any required tooling or process adjustments.
Transfer the approved parameters and inspection requirements to pilot or volume production.
Complete final inspection, protection, packaging and shipment according to project requirements.
A typical new project may require approximately four to seven weeks from confirmed drawing to initial samples. Complex tooling, special testing, heat treatment or machining may require additional time.
Precision investment casting is suitable for stainless steel, carbon steel and alloy steel parts with complex profiles, integrated features or detailed surfaces that would otherwise require extensive machining, welding or multi-part assembly. It is especially practical for recurring production where near-net-shape casting can reduce material waste and machining allowance.
Suitable components often include curved surfaces, ribs, bosses, mounting structures, internal details and several functions combined into one casting. Final feasibility depends on alloy selection, part size, wall thickness, dimensional requirements and expected production volume.
CNC machining or another casting method may be more practical for very low-volume parts, extremely simple geometries or components requiring tight tolerances across most surfaces.
Eesson reviews the drawing, material, section transitions, machining surfaces, heat treatment, finish and inspection requirements before confirming the investment casting process.
Room J757, No. 5358, Huyi Rd, Jiading, Shanghai, China
Room J757, No. 5358, Huyi Rd, Jiading, Shanghai, China
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