Services
Investment Casting
Investment Casting Service — Precision Lost Wax Casting from a Full-Process Foundry
Leesh Holdings produces investment cast parts in steel, stainless steel, alloy steel and copper alloys for agricultural machinery, pump & valve, construction, mining and railway industries — from 0.05 kg to 100 kg, with finishing and inspection all under one roof.
A Leading Investment Casting Supplier for Global OEM & ODM Customers
Leesh Holdings supplies precision investment castings to customers in China and around the world. Over years of development, our lost wax castings have earned their place in demanding applications across railway, automobile and truck, construction machinery, mining machinery, forklift trucks, agricultural machinery, shipbuilding, petroleum machinery, construction, pump and valve, mechanical and electrical, hardware tools, and electric power equipment.
We operate both silicon sol and water glass investment casting lines, so we can match the process to your part — finer tolerance and surface finish where you need it, and cost-effective volume production where you don't.
Why customers choose our investment casting service
- Two process routes: silicon sol and water glass
- Complex geometry and fine detail cast near-net-shape
- In-house heat treatment, machining and surface treatment
- Full inspection: chemistry, mechanical tests and NDT
- OEM and ODM support with export documentation
Investment Casting Capabilities: Tolerances & Surface Finish
Both processes follow the lost wax route — the difference is the shell binder. Silicon sol (colloidal silica) delivers the highest accuracy; water glass offers excellent value for larger and higher-volume parts.
| Process | Mass (kg) | Tolerance Standard | Casting Tolerance (CT) | Surface Roughness |
|---|---|---|---|---|
| Silicon Sol | 0.05 – 50 | ISO 8062 | CT4 – CT6 | Ra 3.2 – 6.3 μm |
| Water Glass | 0.10 – 100 | ISO 8062 | CT6 – CT8 | Ra 6.3 – 12.5 μm |
Tolerance grades follow the ISO 8062 system for castings. Final tolerance is confirmed against your drawing during engineering review.
The Investment Casting Process, Step by Step
Every investment cast part begins as a wax pattern and ends as a finished, inspected component. Here is how your part moves through our foundry.
Wax Pattern Injection
Wax is injected into a metal die to form a precise pattern of your part — the "lost wax" that gives the process its name.
Pattern Assembly
Wax patterns are gated onto a central wax sprue to build a tree, allowing many parts to be cast in a single pour.
Ceramic Shell Building
The tree is dipped in ceramic slurry and coated with refractory stucco, layer by layer, using silicon sol or water glass binder.
Dewaxing
Steam autoclaving melts the wax out of the shell, leaving a precise, heat-resistant ceramic cavity.
Melting & Pouring
Preheated shells are filled with molten metal at controlled temperature. Chemistry is verified before each pour.
Finishing & Inspection
Parts are cut from the tree, ground, heat treated and machined as required, then dimensionally and metallurgically inspected.
Materials We Investment Cast
From everyday carbon steel to corrosion-resistant stainless grades and copper alloys, we cast to your specified grade with verified chemistry.
| Material Family | Common Grades |
|---|---|
| Stainless Steel | SUS304, SUS316, SUS304L, SUS316L, SUS321, SUS310S, 1.4301, 1.4401, 1.4404, CF8, CF8M, 316Ti, 904L |
| Stainless Iron | 201, 410, 420, 430, 431, 440C, 1.4021, 1.4016 |
| Carbon Steel | A3, Q235, Q355, 20#, 35#, 45#, 50#, 1045, S235JR, C45 |
| Alloy Steel | 20Cr, 20CrMo, 20CrNiMo, 40Cr, 40CrMo, 40CrNiMo, 42Cr, 42CrMo, 42CrNiMo, 30CrMnSi, 16MnCr5, 4140, 8630 |
| Brass | H59, H62, H65, H70, H75, H80, HPb59-1, HMn58-2, C36000 |
| Copper Alloys | T2, Tin bronze, Aluminum bronze, Silicon bronze, Cu-Ni white copper |
This is our basic material range but is not limited to it — special grades can be arranged on request. Send your material specification with the inquiry.
Industries & Parts We Serve with Investment Casting
Investment casting earns its place wherever parts need complex shapes, smooth surfaces and repeatable quality — at a lower cost than machining from solid.
Agricultural Machinery
Seed opener parts, disc blades, plow shares, linkage components
Pump & Valve
Impellers, valve bodies, wear rings, corrosion-resistant trim
Railway & Automotive
Brake and coupler parts, suspension components, brackets
Construction & Mining
Excavator wear parts, crusher components, bucket teeth holders
Marine & Offshore
Fittings, deck hardware, corrosion-resistant castings
Hardware & Tools
Hand tool heads, lock parts, fittings with fine surface detail
Power & Electrical
Conductor fittings, switchgear parts, insulator hardware
Petroleum Machinery
Fittings, valve internals, instrumentation hardware
Forklift & Machinery
Counterweight parts, hydraulic fittings, structural hardware
Inside Our Investment Casting Foundry
A look at the production floor behind your investment casting service — from wax injection to the inspection lab.
Wax Pattern Assembly
Wax patterns gated onto the sprue to build a complete casting tree.
Ceramic Shell Building
Multi-layer ceramic shells built by slurry dipping and stuccoing.
Melting & Pouring
Controlled-temperature pouring into preheated ceramic shells.
Inspection & Testing
Dimensional, chemical and mechanical verification before dispatch.
Post-Casting & Surface Treatment, All In-House
You receive a part that is closer to finished — we handle the steps between "cast" and "ready to assemble".
Post-Casting Processes
Surface Treatments
How We Verify Every Investment Casting
We invested in a complete set of inspection facilities so that physical, chemical, non-destructive and geometric requirements are verified in-house — no third-party delays, no guesswork.
Investment Casting Questions, Answered
The questions buyers ask us most — before sending drawings.
What is investment casting?
Which materials can be investment cast?
What part sizes and tolerances can you achieve?
Do you offer post-casting machining and surface treatment?
How fast can I get a quotation?
What is the difference between investment casting and sand casting?
Ready to Start Your Investment Casting Project?
Send us your drawings today — our engineers will review manufacturability and return a quotation within 24 hours.
Email Us for a Free Quote
