Why Source Investment Castings from Vietnam?
Vietnam's investment casting industry has been serving global pump, valve, automotive, and industrial OEMs for over two decades. Driven by Japanese and Korean industrial companies that moved production there ahead of Western buyers, Vietnamese foundries have developed world-class capability in silica sol precision casting and water glass casting — often at 30–50% lower cost than equivalent Chinese foundries, and without Section 301 tariff exposure.
DEWIN's role is to take the risk out of finding the right foundry. We've physically visited, photographed, and scored every foundry in our network against our 50-point Dolphin audit. You see the real factory — the pour floor, the shell dipping line, the heat treatment equipment, the inspection lab — before you place your first order.
The result: the cost advantage of Vietnam investment casting, without the quality unknowns of sourcing from a factory you've never seen.
Investment Casting Processes
Silica Sol (Precision) Process
- ✓ Surface finish: Ra 1.6–3.2µm
- ✓ Tolerances: CT4–CT6 per ISO 8062
- ✓ Best for stainless steel and superalloys
- ✓ Part weight: 5g to 50kg
- ✓ Ideal for pumps, valves, marine, food-grade applications
Water Glass (Standard) Process
- ✓ Surface finish: Ra 6.3–12.5µm
- ✓ Tolerances: CT6–CT8 per ISO 8062
- ✓ Best for carbon and alloy steels
- ✓ Part weight: 100g to 80kg
- ✓ 20–30% lower cost than silica sol for suitable applications
Rapid Prototype Casting
- ✓ 3D-printed wax or SLA patterns — no tooling required
- ✓ 1–20 pieces, 2–3 week turnaround
- ✓ Same production material and quality
- ✓ Ideal for design validation before tooling commitment
Secondary Operations
- ✓ CNC machining of critical dimensions
- ✓ Heat treatment: anneal, quench, temper, age hardening
- ✓ Surface: passivation, electropolishing, plating, painting
- ✓ NDT: X-ray, MPI, dye penetrant, ultrasonic
Materials We Cast
🔩 Stainless Steels
304 · 316 · 316L · CF8M · 17-4PH · 2205 Duplex · 410 · 420 · 440C
Most requested: CF8M (pumps/valves), 17-4PH (industrial/aerospace), 316L (food & marine)
🏗️ Carbon & Alloy Steels
WCB · WCC · 1020 · 1045 · 4140 · 4340 · 8620 · 8630
For: structural components, gears, heavy-duty industrial parts
⚡ Aluminum Alloys
A356 · A357 · ZL101 · ZL104
For: lightweight precision parts, aerospace brackets, electronic enclosures
🌊 Copper & Bronze
C83600 · C95800 · C93700 · C90500 · Brass
For: marine fittings, pump impellers, bearings, valves
🚀 Superalloys
Inconel 625 · Inconel 718 · Hastelloy C276 · Stellite 6 · Monel 400
For: high-temperature, corrosion-resistant, wear applications
🔧 Tool & Specialty Steels
D2 · H13 · S7 · Cobalt-chrome (medical) · Titanium (limited)
For: tooling, medical implants, high-wear industrial parts
What Makes DEWIN Different: The Dolphin Audit
Every investment casting foundry in our network has been scored on 50 checkpoints before a single order is placed. Unlike Alibaba listings or trade fair contacts, you get full factory transparency before you commit.
How Vietnam Investment Casting Pricing Compares
Vietnam's lower labor costs + no Section 301 tariff exposure makes it significantly more cost-competitive than China for US-bound and EU-bound orders. The savings are structural — not dependent on currency fluctuations.
| Part Example | US Foundry | China + Tariff | Vietnam (DEWIN) |
|---|---|---|---|
| SS316 valve body (500g, qty 500) | $28–38 ea | $12–16 + 25% tariff | $8.50–11.50 ea |
| 17-4PH impeller (300g, qty 1,000) | $22–30 ea | $9–12.50 + 25% tariff | $6.50–9.00 ea |
| Carbon steel bracket (1.2kg, qty 2,000) | $18–25 ea | $7.50–10 + 25% tariff | $5.50–7.50 ea |
| A356 aluminum housing (800g, qty 500) | $15–22 ea | $6.50–9 + 25% tariff | $4.80–6.80 ea |
Prices are est. per-piece at listed quantities, excluding tooling. Get an exact quote for your part.
Industries We Cast For
Pumps & Valves
Valve bodies, impellers, pump housings, flanges, pipe fittings, ball valve components
Automotive
Turbo housings, exhaust components, suspension brackets, shift forks, sensor housings
Aerospace & Defense
Structural brackets, actuator components, turbine shrouds, landing gear fittings
Industrial Equipment
Gearbox housings, bearing carriers, coupling flanges, machine structural parts
How Your Investment Casting Project Works
Send Your Design
Upload 3D CAD (STEP/IGES) or 2D drawings with material and quantity. We review for castability and provide DFM feedback.
Factory Match & Quote
We match your project to the right foundry from our audited network. Detailed quote covering tooling, piece price, and lead time in 48h.
Tooling & Samples
Wax die in 2–4 weeks. First article samples with dimensional report, material cert, and mechanical test results.
Production & Delivery
Mass production with in-process QC, NDT inspection, and pre-shipment inspection by our team. Full documentation package.