INVESTMENT CASTING
Investment Casting Manufacturer in India – Precision Stainless Steel Lost Wax Castings
Pashupati Exports operates a dedicated precision investment casting facility producing high-accuracy stainless steel components using the lost wax casting process. Also known as lost foam casting or precision casting, this technique allows us to produce complex near-net-shape components with tight dimensional tolerances, smooth surface finishes, and excellent mechanical properties — all without the need for expensive secondary machining in most cases. Our temperature-controlled production environment ensures dimensional stability and consistency at every stage of the casting process, from wax injection through final inspection.
What Is Investment Casting
Investment casting is the preferred manufacturing method when components require complex geometry, thin walls, fine surface detail, or tight tolerances that are difficult or impossible to achieve through sand casting or machining alone. It is widely used in industries where performance and precision are non-negotiable — including valve manufacturing, pump engineering, architectural hardware, and general industrial equipment. By choosing investment casting over alternative processes, buyers benefit from reduced material waste, lower machining costs, and superior as-cast surface finish, typically in the range of 125 to 250 Ra micro inches.
Our Investment Casting Process — Step by Step
Step 1 — Wax Pattern Injection
Precision metal dies are used to inject wax patterns to the exact geometry of the final component. Each wax pattern is a replica of the finished part.
Step 2 — Wax Assembly
Individual wax patterns are assembled onto a central wax runner system to form a cluster, allowing multiple parts to be cast in a single pour.
Step 3 — Ceramic Shell Coating
The wax cluster is repeatedly dipped into ceramic slurry and coated with fine refractory sand, building up a hard ceramic shell around the patterns.
Step 4 — Dewaxing
The ceramic shell is placed in an autoclave or flash fire furnace to melt and drain the wax, leaving behind a hollow ceramic mould ready for casting.
Step 5 — Casting & Pouring
Molten stainless steel or other alloys are poured into the preheated ceramic shell. Our in-house spectrometer verifies alloy composition before every pour.
Step 6 — Shell Removal & Cleaning
After cooling, the ceramic shell is broken away and individual castings are separated from the runner system by cutting.
Step 7 — Heat Treatment
Castings undergo solution annealing, hardening, or other heat treatment as required by the specification.
Step 8 — Machining & Final Inspection
Our in-house CNC machine shop handles all post-cast machining, drilling, tapping, and surface finishing. Every casting is dimensionally inspected and documented before dispatch.
Materials We Cast
- Stainless Steel — CF8 (304), CF8M (316), CF3 (304L), CF3M (316L), 17-4 PH
- Duplex & Super Duplex Stainless — CD4MCu, CE8MN
- Carbon & Alloy Steel — WCB, WCC, LCB, LCC, WC6, WC9
- Nickel Alloys — Hastelloy C, Inconel 625 on request
- Aluminium Alloys — A356 on request for lightweight applications
Tolerances & Surface Finish
- Dimensional tolerance: +/-0.1mm to +/-0.3mm depending on part geometry and size
- Weight range: 0.05 kg to 50 kg per piece
- Surface finish: 125 to 250 Ra microinches as-cast
- Wall thickness: minimum 2mm achievable on standard geometries
Products & Applications
Valves
Valve bodies, bonnets, discs, balls, seats, and stems for gate, globe, ball, butterfly, and check valves. Supplied to valve OEMs in the USA and Europe.
Pumps
Pump casings, impellers, wear rings, and bearing housings for centrifugal, submersible, and chemical pumps.
General Engineering
Brackets, levers, housings, connectors, gears, and custom OEM components for machinery manufacturers.
Architectural Hardware
Door handles, hinges, locks, railings, and decorative hardware in stainless steel with polished or satin finish.
Why Source Investment Castings From India
India has established itself as one of the world’s leading sources of precision investment castings, offering significant cost advantages over foundries in Europe and North America — typically 30% to 50% lower unit costs for equivalent quality. Pashupati Exports combines these cost advantages with ISO 9001 certified quality systems, full material traceability, and export-ready documentation including material test reports, dimensional inspection reports, and certificates of origin.
Frequently Asked Questions
What alloys can you cast?
What is the typical lead time?
What is the minimum order quantity?
Do you provide pattern and tooling storage?
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