FlowMarket
Where to source investment casting: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the lost-wax casting you need — alloy, part weight and geometry, tolerance class, surface finish, annual volume, testing and certifications — and the AI agent matches you with verified precision foundries, then requests quotes, tooling cost and lead times from every match at once. Getting matched is free for buyers.
Sourcing investment casting
Investment casting — lost-wax casting — produces the most accurate castings available. A wax replica of the part is coated in ceramic slurry, the wax is melted out, and metal is poured into the resulting shell. Because the mould has no parting line and reproduces the wax exactly, the process delivers fine detail, thin walls and surfaces smooth enough to use as-cast.
That precision buys something specific: parts that would otherwise be machined from solid, or welded from several pieces, can be cast in one shot in almost any alloy — including stainless steels and superalloys that are difficult and expensive to machine. The trade-off is a wax tool up front and a longer process chain, so it earns its place where geometry is complex or the material is hard to cut.
Where investment casting wins
Complex geometry in one piece
No parting line and no draft requirement means undercuts, internal passages, thin webs and organic shapes come straight out of the shell. Turbine blades, impellers, valve bodies and manifolds are typical — parts that would need multi-axis machining or several welded components otherwise.
Difficult alloys
Stainless steels, tool steels, cobalt and nickel superalloys, titanium and bronze all cast well. For materials that are slow and costly to machine, casting close to final shape removes most of the cutting entirely.
Accuracy and finish
- Tolerances — typically ISO 8062 CT4–CT6, far tighter than sand casting.
- Surface finish — around Ra 1.6–3.2 µm as cast, often usable without further work.
- Thin walls — down to roughly 1.5 mm, sometimes less on small parts.
- Near net shape — minimal machining stock, so less material and less cutting time.
What to specify when sourcing investment casting
Foundries quote from alloy, weight and volume, but tolerance and testing shape the price just as much:
- Alloy & standard — stainless grade, carbon steel, superalloy, bronze or titanium.
- Part weight & size — casting weight and envelope, which decide shell handling and pour.
- Annual volume — wax tooling is amortised over the series; state the yearly quantity.
- Tolerances — CT class, plus which features are machined afterwards.
- Surface finish — as-cast Ra, or polishing/passivation requirements.
- Testing — X-ray, dye penetrant, pressure test, material and dimensional reports.
- Certifications — ISO 9001, AS9100 for aerospace, PED or NADCAP where relevant.
- Secondary operations — machining of critical faces, heat treatment, surface coating.
Investment casting vs. machining from solid
If the part is simple and the material machines easily, cutting from bar is usually cheaper at low volume. If the geometry is complex, the alloy is expensive or hard to machine, or you would otherwise weld several parts together, investment casting is often dramatically cheaper per part once volume covers the wax tool. Describing the part rather than the process lets the agent surface both casting and machining suppliers when the choice is genuinely close.