Castinmetal.com is operated by Xinyouyuan Hardware Products Co., Ltd.

Investment casting: Your Industry Solution

We specialize in investment casting, the preferred process for casting metal.

Fast delivery cycle

Most standard orders ship within 4-6 weeks, while urgent projects can be expedited in as little as 2 weeks

investment casting quality through rigorous quality assurance, advanced testing, and strict process controls

One-stop service from design to production, supporting small-batch manufacturing and OEM/ODM

Quality Assurance

Expert Design

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DONGGUAN XINYOUYUAN HARDWARE PRODUCTS CO., LTD specializes in manufacturing high-end metal prototypes and mass-produced components. Using cutting-edge lost-wax casting technology, we serve a diverse range of industries, including marine equipment, automotive components, medical devices, home furnishings, jewelry design, and industrial machinery. Our commitment to achieving the perfect metal representation of complex designs is unmatched. We offer unparalleled detail reproduction and strict tolerance control, helping our clients achieve significant improvements in product performance and quality.

Precision-cast automotive structural components

Our Business Areas

We provide comprehensive solutions, from concept design to precision manufacturing. We utilize advanced CNC machining, 3D printing, and metallurgical technologies. Our ISO-certified facilities ensure rigorous quality control at every stage, including dimensional accuracy of ±0.01 mm. We specialize in handling complex geometries, such as those found in marine and medical-grade stainless steel applications. We provide customized engineering components for industries that require stringent standards. We transform designs into high-performance metal components with millimeter-level precision and consistent reliability.

What this foundry can actually cast

Size and weight. Parts from 0.01 kg to 50 kg, with the sweet spot between 0.05 and 8 kg. Maximum envelope is roughly 500 × 400 × 300 mm, set by our shell building and pouring capacity rather than by the wax press. Above about 20 kg the shell has to be built with extra backing layers and the gating redesigned, so lead time grows by a week.

Alloys we run every week. Stainless 304, 316, 316L, 17-4PH and duplex 2205; carbon and low-alloy steels including 4140 and WCB; aluminium A356-T6; brass C360; and cobalt alloys such as Stellite 6 for wear parts. Inconel 718 and other nickel superalloys are quoted case by case because the melt practice and shell chemistry change. If your drawing names a Chinese grade (ZG230-450, 20CrMnTi), send the equivalent standard and we will confirm it before quoting.

Tolerances, walls and finish

Dimensional tolerance. ISO 8062-3 CT6 is our default and is what most drawings should specify. CT5 is achievable on critical features once the wax die has been corrected with the first-article data. CT4 is realistic only on small parts with a short, stiff dimension chain. Tightening from CT6 to CT4 typically adds 25–30% to the unit price because of the extra wax handling, straightening and layout inspection.

Minimum wall. 2.5 mm for carbon and low-alloy steel, 1.5 mm for small stainless parts, and 0.8–1.0 mm in limited areas where the wax die, the shell and the gating are all designed around it. Below those numbers the failure mode is not "thin wall" but shell cracking and misruns, and the rejection rate climbs faster than the weight saving.

As-cast surface. Ra 6.3 µm is routine, Ra 3.2 µm comes from tighter slurry and stucco control on the prime coat, and Ra 1.6 µm or better is a machining result, not a casting result. Bead blasting and passivation are included; mirror polishing and electro-polishing are quoted separately.

Tooling, quantity and lead time

Wax die. Aluminium dies are standard: about USD 1,350 for a small simple cavity, roughly USD 1.85 per cm² of projected area beyond that. Tooling takes 18–25 working days. Life is 50,000–100,000 shots for aluminium and beyond 100,000 for steel, and a worn die shows up first as flash and dimensional drift, not as a hard failure.

Minimum order. 100 pieces is the practical MOQ for a new die, because that is where the tooling amortisation stops dominating the price. Prototypes from 1 piece are possible when you supply printed patterns or when we cut a cheap silicone or printed-wax tool.

Lead time. First articles 5–7 days after tooling sign-off, repeat orders 25–35 days from PO to shipment. Expediting to 2–3 weeks is available on small lots and adds roughly 18% to the unit price, mostly for air freight and weekend shell-line slots.

What to send for a firm quote

Files. A STEP file (AP214 or AP203) plus a 2D PDF showing datums, GD&T, critical dimensions and any machining allowance. The 3D model settles the geometry; the 2D drawing settles the tolerance and inspection plan. STEP AP242 with PMI is welcome but we still ask for the PDF. Native SolidWorks, Creo, NX, Inventor and CATIA files also open. Upload limit is 25 MB per file; larger assemblies go by mail or a shared link.

Commercial detail in the same message. Annual volume, first-order quantity, target price if you have one, Incoterm, and whether the part ships as-cast or machined. Those five lines change the quoted number more than any design detail after the weight and alloy are fixed.

Quality evidence and inspection

Documents that ship with the lot. Material certificate to EN 10204 3.1, dimensional report against the drawing's critical characteristics, and visual plus weight check on every piece. On request we add X-ray to ASTM E505, fluorescent penetrant to ASTM E165, radiography of specific sections, hardness and tensile testing, and a full FAI report to AS9102 for aerospace or medical buyers.

Process control behind it. Slurry viscosity and temperature are logged every shift, shells run 5–7 layers depending on the alloy and wall, dewax is steam at 0.6–0.75 MPa with a controlled pressure ramp, and burnout sits at 1125–1195 °C depending on the furnace. Pouring is done with the shell at 700–850 °C and the gate sized so the metal enters the cavity below about 0.5 m/s — that single number removes most of the scattered porosity and oxide film defects buyers complain about.

Why two foundries quote 40% apart

Five usual reasons. One quote includes machining and the other does not; one assumes CT6 and the other quietly prices CT4; shell layer count differs (4 layers versus 7 changes both cost and surface); alloy source differs (certified mill stock versus remelt); and the scrap allowance buried in the price differs. Ask for the breakdown — metal, shell, pour and cut-off, finishing, tooling — and the gap becomes explainable within a few minutes.

Where we sit. We are a mid-size lost-wax shop in Dalingshan, Dongguan: wax injection, silica-sol shell line, induction melting, heat treatment, CNC and inspection under one roof. That means one purchase order, one schedule, and no finger-pointing between a caster and a machine shop when a dimension drifts.

Still deciding?

Get a number before you commit. The self-service calculator on this site returns an indicative unit price and tooling cost in about 60 seconds from four inputs: alloy, finished weight, tolerance grade and quantity. It uses the same cost model we quote from, so the range you see is the range you should expect, and it tells you which parameter is driving the price. When you have a drawing or a STEP file, send it and we will replace the estimate with a binding number.