RFQ@renyicastings.com
Fast Response Email Support
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Ningbo city
China 315137
Fast Response Email Support
GMT+8
China 315137
Heavy-Duty Sand Casting Specialist
Specialized in oversized sand castings for heavy industry, mining, power generation, and infrastructure. Our 160,000 sq ft facility with 10-meter ceilings and dual 5-ton overhead cranes delivers complex, large-format components through resin sand moulding with in-house pattern-making.
Max Single Part Weight
Manufacturing Floor
Stainless · Carbon · Aluminum
T1 Sample Lead Time
▶ Large Casting Production Video
Dual 5-ton overhead cranes
10-meter ceiling height
Three material families
Certified welders on staff
Quality verified on-site
Large Casting
Renyi’s 160,000 ft² facility — resin sand process for oversized castings up to 5 metric tons in stainless, carbon steel & aluminum
“Large castings are components exceeding ~200 kg that cannot be produced on automated moulding lines. They require manual moulding with resin sand — a process that provides the dimensional stability, thermal resistance, and flexibility needed for oversized, heavy-duty parts.”
Renyi’s 160,000 sq ft facility features 10-meter ceilings and dual 5-ton overhead cranes — purpose-built for handling oversized components. Our skilled pattern-makers and moulders work with resin-bonded sand to produce castings up to 5 metric tons in stainless steel, carbon steel, and aluminum.
With certified MIG and TIG welders on staff, an in-house testing laboratory, and capabilities spanning welding, stamping, and sand blast finishing, you deal with one supplier from drawing to delivered component — eliminating multi-vendor coordination for heavy-duty projects.
Manual Moulding
Resin Sand Process
Up to 5 Metric Tons
Stainless · Carbon · Aluminum
MIG & TIG Welding
In-House Testing Lab
Stamping
When your component is too heavy, too complex, or too large for automated casting lines — our manual resin sand process delivers without compromise.
160,000 sq ft manufacturing floor with 10-meter ceilings and dual 5-ton overhead cranes. Single-piece castings up to 5 metric tons — one factory, one quality standard.
On-site testing laboratory for material verification and quality assurance. Every casting inspected and validated before shipment — no waiting on third-party lab results.
MIG and TIG welding by certified welders with welder stamps. Stamping capability for secondary operations. Comprehensive in-house fabrication support.
Stainless steel, carbon steel, and aluminum — three material families under one roof. Sand blast finishing and wet paint in-house; powder coating and heat treatment through vetted sub-tier partners.
A purpose-built 160,000 sq ft facility with 10-meter ceilings, dual 5-ton overhead cranes, and an in-house testing laboratory — designed from the ground up for large-format casting production across stainless steel, carbon steel, and aluminum.
10-meter ceiling height with 2 overhead cranes at 5-ton capacity each — ample space for oversized moulds and heavy components
On-site material testing and quality verification — spectrometer analysis, mechanical testing, and dimensional inspection without third-party delays
Certified welders with welder stamps for structural and cosmetic welding on stainless steel, carbon steel, and aluminum castings
In-house stamping capability plus sand blast finishing and wet paint — with powder coating and heat treatment through vetted sub-tier partners
Heavy-duty stainless steel, carbon steel, and aluminum components manufactured for mining, power generation, and infrastructure clients worldwide.
QT500-7 Ductile Iron Split Volute Casing — 3.2 Tons — Resin Sand Cast + Large-scale CNC Machining
QT600-3 Ductile Iron Machine Platen — 4.5 Tons — Resin Sand Cast + KURAKI CNC Boring & Milling
| Grade | Type | Applications |
|---|---|---|
| 304 / CF8 | Austenitic | Food, chemical, general corrosion resistance |
| 316 / CF8M | Austenitic | Marine, pharmaceutical, chloride environments |
| 2205 / CD3MN | Duplex | High-strength corrosion-resistant applications |
| Grade | Standard | Applications |
|---|---|---|
| ZG230-450 | GB/T 11352 | General structural |
| ZG270-500 | GB/T 11352 | Load-bearing parts |
| WCB | ASTM A216 | Valves, flanges |
| G4140 (42CrMo) | ASTM A732 | High-stress components |
| Alloy | Process | Applications |
|---|---|---|
| A356 (AlSi7Mg) | Sand / Gravity | Structural, automotive |
| A319 (AlSi6Cu) | Sand Cast | Engine blocks, housings |
| A380 (AlSi8Cu3) | Die Cast | General-purpose enclosures |
✦ In-house ▸ Sub-tier supplier
Max Part Weight
Manufacturing Floor
Ceiling Height
Overhead Cranes
Sand Blast Finish ✦
Wet Paint ✦
Mechanical Polishing ✦
Electro Polishing ✦
Powder Coating ▸
Heat Treating ▸
From pattern design to finished component — every stage managed in-house on our manual moulding line.
01
In-house pattern-making in wood, resin, or metal — matched to your part geometry and production volume
02
Chemically bonded sand compacted around the pattern to form a rigid, dimensionally stable mould
03
Sand cores placed to form internal passages, cavities, and complex internal geometries
04
Molten iron or steel poured into the mould cavity under controlled temperature conditions
05
Controlled cooling period, then sand mould broken away to reveal the raw casting
06
Heat treatment, shot blasting, CNC machining, and dimensional inspection before shipment
From raw large castings to fully finished, heat-treated, and machined components — one supplier, one shipment.
Stainless steel, carbon steel, and aluminum castings up to 5 metric tons
MIG and TIG welding by certified welders with welder stamps
Stamping and secondary fabrication operations
Sand blast finishing and wet paint finishing (in-house)
Mechanical and electro polishing (in-house)
Powder coat finishing (sub-tier supplier)
Heat treating — annealing, normalizing, quench-and-temper (sub-tier supplier)
In-house testing laboratory for material and dimensional verification
CNC machining of critical surfaces, bores, and mating faces
Export packing and logistics coordination
Certified welders with welder stamps for structural and cosmetic welding across stainless steel, carbon steel, and aluminum.
Sand blast finish, wet paint, and mechanical / electro polishing performed on-site. Powder coating and heat treating through vetted sub-tier partners.
On-site material testing, spectrometer analysis, and dimensional inspection — quality verified without third-party delays.
In-house stamping capability for secondary operations, combined with CNC machining for precision surfaces, bores, and mating faces.
Heavy-duty castings from Renyi serve the most demanding industrial applications worldwide.
– Crusher frames & housings
– Jaw plates & cheek plates
– Mill liners
– Impellers & wear plates
– Conveyor drive housings
– Turbine housings & casings
– Generator frames
– Motor bodies & end shields
– Bearing pedestals
– Flywheel housings
– Manhole covers & frames
– Gully grates & drainage
– Structural machine bases
– Bridge bearing plates
– Railway fittings
– Propeller brackets
– Rudder stocks & skegs
– Ballast system components
– Winch drum housings
– Hull fittings & fairleads
Our facility handles single-piece castings up to 5 metric tons, supported by dual 5-ton overhead cranes in a 160,000 sq ft manufacturing space with 10-meter ceilings.
Stainless steel (304, 316, 2205), carbon steel (ZG230–ZG310, WCB, 42CrMo), and aluminum (A356, A319, A380). All verified by our in-house testing laboratory.
Standard T1 samples in 30–40 days including pattern-making. Expedited option available at 20 days for urgent projects. RFQ feedback within 12 hours.
We offer MIG and TIG welding performed by certified welders with welder stamps, plus in-house stamping capability. All three material families — stainless, carbon steel, and aluminum — are supported.
In-house: sand blast finish, wet paint, and mechanical / electro polishing. Through vetted sub-tier partners: powder coat finishing and heat treating (annealing, normalizing, quench-and-temper).
Send your drawings (2D/3D), material grade, target weight, and quantity. Our engineering team will review manufacturability and return a detailed quotation covering casting, welding, finishing, and machining options.
Stainless steel, carbon steel, and aluminum — all quoted
MIG/TIG welding and stamping options itemized
In-house finishing vs sub-tier services clearly separated
In-house testing lab verification included
Send drawings (STEP / DXF / PDF) to us — engineering feedback within 12 hours. Stainless, carbon steel, or aluminum — up to 5 tons.