Finding a reliable investment casting manufacturer in China takes more than a Google search — you need a foundry that reads your drawing accurately, holds tolerance in production, and ships with clean documentation every time.
Qianhao is a factory-direct precision investment casting manufacturer in Ningbo, China. Since 1994, we have supplied custom lost wax castings to buyers across 40+ countries in carbon steel, stainless steel, alloy steel and duplex grades.
Chinese precision foundries now meet and often exceed Western quality standards — at 40–60% lower unit cost. Here is what makes sourcing from China the right move for global manufacturers.
Steel mills, ceramic suppliers and machining centres are clustered within hours of our foundry, cutting lead times and raw material costs that Western suppliers cannot match.
ISO 9001, IATF 16949, CE, BV and DNV certifications mean your parts meet the same standards you would demand from a European or US foundry.
CNC wax injection, 6-axis robotic shell coating, CMM dimensional inspection and OES spectrometer analysis are all standard at leading Chinese investment casters.
Trial orders, small batches and high-volume production all handled from one source. No need to change suppliers as your order scales.
China's investment casting industry operates two distinct lost wax processes. Choosing the right one for your part is the first decision any professional China investment casting supplier should help you make — not leave to guesswork.Let our experts evaluate your project and recommend the most cost-effective process for your components.
Steel investment casting makes up the majority of our precision investment casting output here in China. We pour carbon steel, alloy steel, stainless steel and heat-resistant steel grades on a daily basis — alongside duplex, tool steel and ductile iron for specialist applications. If your drawing specifies a grade, we will confirm castability before quoting.
General-purpose industrial castings. Excellent strength-to-cost ratio. Water glass or silica sol process depending on tolerance requirement.
Corrosion-resistant castings for food processing, marine, chemical and medical applications. Silica sol process for best surface finish.
High-strength alloy castings for demanding mechanical applications — gears, shafts and structural components requiring superior fatigue resistance.
Two-phase ferritic-austenitic structure for superior strength and stress corrosion cracking resistance in aggressive environments.
Cast components for furnace parts, radiant tubes and high-temperature industrial equipment operating above 600°C continuously.
Cost-effective ferrous castings for housings, brackets and structural components where weight and rigidity take priority over corrosion resistance.
Every part follows a rigorous 8-stage manufacturing sequence with quality inspection points built into each stage — not just at final inspection.
CNC-machined aluminium die injects melted wax under high pressure. Each wax pattern replicates the final part geometry with high dimensional fidelity.
QC: Dimensional checkMultiple wax patterns are welded onto a central sprue to form a "tree". Gate and runner geometry is optimised to control metal flow and solidification.
QC: Weight checkThe tree is dip-coated in silica sol slurry and stuccoed with refractory sand. 6–8 layers are built up, each dried before the next. Shell thickness: ~9mm.
QC: Shell integritySteam autoclave at 120°C melts wax from the shell. Recovered wax (95%) is recycled. The hollow ceramic mould is ready for metal pouring.
QC: Shell inspectionShell pre-heated to 1,000–1,100°C for sintering strength. Molten metal poured into the hot shell — pre-heating prevents thermal shock and improves surface detail.
QC: Temp loggingAfter cooling, the ceramic shell is vibrated off. Individual castings are cut from the tree by band saw or disc cutter and the sprues are ground clean.
QC: Visual inspectionSolution annealing, normalising or quench-and-temper as specified. Heat treatment furnaces are calibrated and temperature-logged per ASTM A370.
QC: Hardness testCMM dimensional inspection, OES chemical analysis, mechanical testing and NDT (where specified) before packing and shipping with full documentation.
QC: Full cert packOur quality management system is independently audited. Every heat charge is traceable from raw material certificate to final inspection report.
Full production process control — from incoming material to outgoing inspection
Required by Tier 1 and Tier 2 automotive suppliers globally
Required for pressure-bearing parts sold into the EU market
Approved for hull structures, piping systems and marine machinery
Zeiss Contura G2. Dimensional GD&T verification to ±0.005mm
Chemical composition analysis of every heat charge before pouring
Internal porosity and shrinkage detection for critical castings
Microstructure analysis, grain size and phase verification
Yield strength, UTS and elongation to ASTM A370 / EN 10002
Surface crack detection for pressure parts and safety-critical castings
The tolerance your part requires determines which process is right for your project. This is the technical starting point for any serious evaluation of China precision investment casting suppliers. The values below follow ISO 8062-3 casting tolerance grades — submit your drawing for a part-specific tolerance assessment at no charge.
| Nominal dimension | Silica Sol — CT5 | Silica Sol — CT6 | Water Glass — CT7 | Water Glass — CT8 | With CNC machining |
|---|---|---|---|---|---|
| Up to 25mm | ±0.13mm | ±0.18mm | ±0.26mm | ±0.36mm | ±0.02–0.05mm |
| 25 – 63mm | ±0.15mm | ±0.22mm | ±0.30mm | ±0.44mm | ±0.02–0.05mm |
| 63 – 100mm | ±0.19mm | ±0.26mm | ±0.36mm | ±0.52mm | ±0.03–0.08mm |
| 100 – 160mm | ±0.23mm | ±0.32mm | ±0.44mm | ±0.62mm | ±0.05–0.10mm |
| 160 – 250mm | ±0.27mm | ±0.38mm | ±0.52mm | ±0.74mm | ±0.05–0.10mm |
| 250 – 400mm | ±0.33mm | ±0.46mm | ±0.64mm | ±0.90mm | ±0.08–0.15mm |
Upload a drawing (PDF, STEP, DWG) — we confirm feasibility and pricing within 24 hours.
A selection of parts produced in the last 12 months. Each entry shows material, tolerance achieved and the industry application.
32 Years of Precision Casting Expertise · Globally Recognized Metal Casting Manufacturer
Qianhao was established in 1994 in Ningbo, Zhejiang — a region with a decades-long concentration of precision metal manufacturing expertise. What began as a regional foundry has grown into a vertically integrated investment casting facility spanning 120,000 m² across six production sites, with over 280 engineers, quality specialists and foundry technicians on the floor.
Investment casting is the core of what we do. Our silica sol and water glass casting lines run six days a week, supported by in-house CNC machining, heat treatment and surface finishing — so the part that leaves our facility is a finished component, not a raw casting that requires further coordination on your end.
120,000
Production Area (m²)
50,000
Annual Capacity (tons)
Multiple casting processes combined with powerful machining capabilities to meet complex part requirements across diverse industries.
Specializing in cast iron, steel castings, forgings and precision machined components — optimized manufacturing processes ensure consistent product performance.
Serving automotive, rail transit, construction machinery, material handling, agricultural machinery and other mission-critical industry sectors.
Genuine feedback from customers across 40+ countries worldwide
"Outstanding casting quality, on-time delivery and a highly professional collaboration throughout. They have become our long-term manufacturing partner."
"Precision meets our strictest tolerances and the price-to-quality ratio is the best in the industry. Highly recommended to fellow manufacturers."
"24-hour quotation turnaround, expert technical support and the fastest response time we have seen from any Chinese supplier."
6+
Production Bases
500+
Employees
40+
Export Countries
32 Yrs
Industry Experience
98%
Client Satisfaction
Questions from procurement managers, engineers and first-time importers — answered plainly.
Qianhao is a globally recognized manufacturer of high-valued added and complex castings for global industry leaders
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