Renyi Castings
RFQ@renyicastings.com
Fast Response Email Support
Mon - Fri: 9:00-17:30
GMT+8
Ningbo city
China 315137
Fast Response Email Support
GMT+8
China 315137
China Investment Casting Factory
One-stop precision investment casting solutions — from tooling design to finished parts. Stainless steel, alloy steel, carbon steel, brass & bronze. Conforming to ASTM · AISI · DIN · JIS specifications.
Material Families: SS / Alloy / Carbon / Brass / Bronze
RFQ Response Time
Tooling Design & Machining
Design → Tooling → Casting → Finishing
Consistent quality, lower cost
Fast sample approval, lower mould cost
±0.18mm standard / ±0.08mm premium
ASTM · AISI · DIN · JIS
Investment Casting
Renyi investment casting facility — precision lost-wax castings in stainless steel, alloy steel, carbon steel, brass & bronze
“Investment casting (lost wax casting) is a manufacturing process in which a wax pattern is coated with a ceramic shell, the wax is melted out, and molten metal is poured into the resulting cavity — producing complex, near-net-shape parts with excellent surface finish and tight tolerances in a wide range of alloys.”
At Renyi Castings, we provide precision investment casting services for customers across automotive, oil & gas, medical, and industrial equipment sectors. Our facility features robotic shell coating, in-house tooling design, CNC machining, and comprehensive surface finishing — all under one roof.
We cast five material families — stainless steel, alloy steel, carbon steel, brass, and bronze — all conforming to ASTM, AISI, DIN, and JIS international standards. Brass investment casting has been part of our production since 2006, serving demand for precision decorative and functional components from a few grams up to 50 lbs. From prototype runs of a single piece to serial production of 50,000+ units per year.
Lost Wax Process
Robotic Shell Coating
SS · Alloy Steel · Carbon Steel
Brass · Bronze
In-House Tooling
CNC Machining
Surface Treatment
Investment casting delivers a unique combination of design freedom, material versatility, and precision that makes it the process of choice for complex, high-performance components.
Full-service capability from design consultation, tooling fabrication, casting, secondary machining, surface treatment, and final assembly — all under one roof.
Stainless steel, alloy steel, carbon steel, brass, and bronze — we cast the exact alloy your application demands, with material certifications provided for every shipment.
Automated shell dipping delivers consistent ceramic layer thickness on every part, reducing defects and scrap compared to traditional manual dipping processes.
China manufacturing economics plus in-house tooling translate to industry-leading unit costs — without sacrificing material integrity or dimensional precision.
Standard tolerance of ±0.18mm and premium tolerance of ±0.08mm. Near-net-shape output minimizes secondary machining and reduces total part cost.
Every casting is measured against ASTM / AISI / DIN / JIS standards. Material certs, dimensional reports, and NDT available on request for each production lot.
Prototype runs from 1 piece, serial production to 50,000+ units per year. Engineering change requests accommodated quickly via in-house tooling modification.
ISO 9001 & IATF 16949 certified. Experienced in export documentation, packing standards, and logistics coordination for ports worldwide.
In 2019, Renyi Castings introduced a fully automated robotic shell coating machine to replace the previous manual dipping process. The robot applies each ceramic slurry layer with consistent arm speed, angle, and immersion time — eliminating human variance that had been the leading cause of shell defects.
Robotic arm controls dip angle, speed, and immersion time for each of 5–7 ceramic layers
All materials conform to ASTM, AISI, DIN, and JIS international specifications. Material certifications provided with every shipment.
304 / 304L
316 / 316L
17-4PH
410 / 420
630 (H900–H1150)
Standards: ASTM A351, A743, A744
Ideal for corrosion-resistant structural, fluid-handling and food-grade applications.
4140 / 4340
8620
H13 Tool Steel
4130
Standards: ASTM A148, A217
High strength and hardness. Used for gears, shafts, brackets and structural components.
WCB / WCC
1020 / 1045
LCC (Low-temp)
WC9
Standards: ASTM A216, A352
Cost-effective general-purpose option. Suitable for valves, pump housings and industrial hardware.
C26000 (Cartridge)
C36000 (Free-cut)
C46400 (Naval)
C38500
Standards: ASTM B16, B283
Excellent machinability and corrosion resistance. Common in plumbing, decorative hardware, and precision fittings. Typical as-cast surface finish: 175 RMS micro-inch. Tolerances within ±.005″ per linear inch.
C83600 (Red Bronze)
C95400 (Al-Bronze)
C90300 (Tin Bronze)
C86300 (Mn-Bronze)
Standards: ASTM B62, B584
Superior bearing and wear properties. Ideal for bushings, marine hardware, and high-load applications where corrosion-resistant finish and conductivity are critical.
±0.18 mm
Normal as-cast tolerance for dimensions up to 12.7 mm. Tighter tolerances achievable with premium tooling and process control.
±0.08 mm
Achievable with precision tooling and optimized wax injection parameters. Ideal for critical mating surfaces and bore dimensions.
±0.005″/inch · 0.003″/0.5″ wall
Axial straightness ±0.005″ per inch of feature length. Bore-to-OD concentricity within 0.003″ per 0.5″ wall thickness.
1–2 mm (0.5 mm possible)
Standard minimum wall thickness 1–2 mm. Walls as thin as 0.5 mm have been achieved within limited surface areas, alloy-dependent.
| Dimension | Normal | Premium |
|---|---|---|
| Up to ½″ | ±.007 | ±.003 |
| ½″ – 1″ | ±.010 | ±.005 |
| 1″ – 2″ | ±.015 | ±.010 |
| 2″ – 3″ | ±.020 | ±.015 |
| 3″ – 4″ | ±.025 | ±.018 |
| 4″ – 5″ | ±.030 | ±.020 |
| 5″ – 6″ | ±.032 | ±.022 |
| 6″ – 7″ | ±.035 | ±.025 |
| 7″ – 8″ | ±.038 | ±.028 |
| Dimension | Normal | Premium |
|---|---|---|
| Up to 12.7 mm | ±0.18 | ±0.08 |
| 12.7 – 25.4 mm | ±0.25 | ±0.13 |
| 25.4 – 50.8 mm | ±0.38 | ±0.25 |
| 50.8 – 76.2 mm | ±0.51 | ±0.38 |
| 76.2 – 101.6 mm | ±0.64 | ±0.46 |
| 101.6 – 127.0 mm | ±0.76 | ±0.51 |
| 127.0 – 152.4 mm | ±0.81 | ±0.56 |
| 152.4 – 177.8 mm | ±0.89 | ±0.64 |
| 177.8 – 203.2 mm | ±0.96 | ±0.71 |
Typical as-cast surface finish: 125–175 RMS micro-inch. Additional finishing operations available below.
Sand Blasting
Shot Blasting
Electropolishing
Passivation
Powder Coating
Painting
Mirror Polish
Heat Treatment
CNC Machining
Tooling Fabrication
First Article Samples
Production Order
RFQ Response
Precision investment castings manufactured for global OEM and tier-1 clients across automotive, oil & gas, medical, and industrial sectors.
316L Stainless Steel Valve Body — Electropolished
17-4PH Pump Impeller — Passivated + CNC Machined
Eight precisely controlled stages — from wax pattern injection to finished part delivery. Each step is performed in-house, giving us full quality ownership and shorter lead times.
01
Molten wax injected into aluminium tooling to form precise patterns
02
Wax patterns welded to a central sprue to form a tree cluster
03
Automated dipping & stuccoing — 5–7 ceramic layers for consistent shell
04
Steam autoclave removes wax, leaving a ceramic cavity mould
05
Ceramic mould fired at 900–1000°C to strengthen and remove moisture
06
Molten alloy poured into pre-heated shell under controlled conditions
07
Ceramic broken away; parts cut from tree by vibration or abrasive wheel
08
Grinding, heat treat, machining, surface treatment & dimensional QC
Our experienced engineers design, machine, and assemble all casting tooling internally — giving us direct control over quality, speed, and cost at every stage of mould development.
1
Engineers review customer drawings for castability, draft angles, wall thickness, and feature accessibility. Design for Manufacturing (DFM) feedback is provided before tooling starts.
2
Aluminium injection tooling is 3D-modelled with parting lines, gates, and ejection system laid out precisely for the wax injection process.
3
Moulds are machined in-house on our CNC machining centres, ensuring dimensional accuracy and eliminating dependency on external tooling suppliers.
4
The tooling is assembled and a trial wax injection is run. Pattern dimensions are checked against 3D data before any production run begins.
5
First article samples are submitted for dimensional and visual inspection. Rapid iteration is possible because tooling adjustments are made on-site, same day.
In-house tooling means immediate corrections without waiting for external mould shops — cutting sample lead time significantly.
No mark-up from third-party toolmakers. Our internal workshop passes savings directly to the customer through lower mould cost.
Engineer who designed the mould oversees the casting process — catching and correcting issues at the source, not after the fact.
Engineering change requests (ECRs) can be incorporated into tooling within days, not weeks — critical for prototype and NPI programs.
From raw investment castings to fully finished, assembled products — we handle the entire chain so you deal with one supplier.
Raw investment castings to finished machined components
Precision CNC machining (turning, milling, drilling, tapping)
Heat treatment (annealing, quench & temper, solution treatment)
Sand blasting and shot blasting
Electropolishing and passivation
Powder coating and painting (RAL color matching)
Mirror polishing for decorative applications
Sub-assembly and kitting services
In-house tooling design and fabrication
Consistent quality backed by ISO 9001 & IATF 16949
Design for Manufacturing analysis on every project — castability, draft angles, wall thickness, and feature accessibility reviewed before tooling.
Non-destructive X-ray inspection for internal porosity, shrinkage, and inclusion detection on safety-critical or structural castings.
Full range of heat treatment processes — annealing, quench & temper, solution treatment, and age hardening to meet specified hardness and mechanical properties.
We assemble inserts, bushings, O-rings and sub-components — shipping ready-to-install units to your line.
Investment castings from Renyi are used in performance-critical applications across the globe — wherever complex geometry, tight tolerances, and high-performance alloys are required.
– Turbo housings & manifolds
– Transmission brackets
– Exhaust components
– Sensor enclosures
– Structural brackets
– Valve bodies & bonnets
– Pump impellers
– Manifolds & flanges
– Flow control components
– Subsea hardware
– Surgical instruments
– Implant components
– Device housings
– Orthopedic fixation plates
– Endoscopy hardware
– Gearbox components
– Hydraulic manifold bodies
– Power tool housings
– Pneumatic valve bodies
– Tooling & fixture parts
There is no strict MOQ for investment castings. We welcome both prototype orders (as low as 1 piece) and serial production runs up to 50,000+ units per year. Tooling investment is a one-time cost.
Tooling fabrication: 15–25 days. First article samples: 3–5 days after tooling approval. Production orders: 25–35 days. RFQ feedback within 12 hours, full quotation within 48 hours.
We cast five material families: stainless steel (304, 316, 17-4PH, 410/420, 630), alloy steel (4140, 4340, 8620, H13), carbon steel (WCB, WCC, 1020, 1045), brass (C26000, C36000, C46400), and bronze (C83600, C95400, C90300, C86300).
Tooling & samples: 50% deposit, 50% after sample approval. Production orders (new customers): 30% deposit, 70% against copy of original B/L. Long-standing regular customers enjoy better terms such as 100% payment after delivery or by B/L copy.
We are open to discuss with clients and resolve at our best effort. Options include: compensating local rework cost if parts can be repaired on-site, 100% refund or credit note for replacement quantity, or full replacement shipment at no charge. If the non-conformity is minor and acceptable, we offer a negotiated discount to close the shipment.
Send your drawings (2D/3D), material grade, surface finish requirements, and target quantity. Our engineering team will review manufacturability and return a full quotation within 12–48 hours.
DFM review — castability analysis included
Tooling cost + unit price itemized separately
Machining and surface treatment options quoted
Heat treatment and NDT options available
Assembly and kitting services available
Send drawings (STEP / DXF / PDF) to us — response within 12 hours.