Renyi Castings
RFQ@renyicastings.com
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Ningbo city
China 315137
Fast Response Email Support
GMT+8
China 315137
Sand Casting Manufacturer
The world’s most widely used casting process — versatile across iron, aluminum, brass, and steel. Producing parts from a few ounces to several tons, our automated and manual moulding lines with in-house tooling deliver high-quality sand castings from prototype to mass production.
Iron · Al · Brass · Steel
Moulding Lines
T1 Sample Lead Time
Sand casting is the most widely used process
Green Sand / Resin / Shell Mold
Iron / Aluminum / Brass / Steel
From grams to 10 metric tons
Fast feedback guaranteed
Sand Casting
Renyi automated sand casting pouring line — orderly production improves safety, output capacity, and cost efficiency
“Sand casting is a metal casting process that uses sand as the moulding material. Molten metal is poured into a cavity formed by compressing sand around a pattern. Sand castings account for over 80% of all castings produced worldwide — making it the most important and widely used casting process.”
Sand is relatively inexpensive, has excellent refractoriness (making it suitable even for steel), and can be mixed with clay and water to produce moulds of virtually any shape or size. The sand mould is broken away after each pour — producing a new part each cycle.
At Renyi Castings, we produce both clay sand (green sand) and resin sand casting patterns. We operate automatic and manual moulding lines, giving us the flexibility to handle everything from single prototype pieces to large-volume production runs — greatly lowering casting cost while maintaining quality and short lead times.
Green Sand
Resin Sand
Shell Mold
Iron · Aluminum · Brass · Steel
Auto & Manual Lines
In-House Tooling
CNC Machining
Sand casting remains the most widely used casting process worldwide because it uniquely combines material versatility, geometric freedom, size range, and cost-effectiveness.
Sand casting works with virtually any castable alloy — from aluminum to cast steel — and produces parts from a few grams to 10 metric tons. No other process matches this range.
Sand patterns are inexpensive to produce (wood, resin, or aluminum) and can be modified easily. Tooling cost is a fraction of die casting or investment casting, making it ideal for prototypes and low-volume runs.
Sand cores allow internal passages, undercuts, and complex internal geometries that other processes cannot match. Parts up to 10 metric tons are routinely produced — far exceeding die casting limits.
Simple sand patterns can be produced in days. For urgent projects, T1 samples in as little as 20 days. No expensive hardened steel tooling required — changes and revisions are quick and low-cost.
Renyi operates both automatic and manual moulding lines. The right choice depends on your order quantity, part size, and budget — our team will guide you to the most cost-effective option.
High-volume production with consistent mould quality, improved safety, and lower unit cost. Best for 500–100,000+ pcs.
Maximum flexibility for prototypes, small batches (10–500 pcs), and oversized parts up to 10 metric tons.
Manual line uses simple wooden or resin patterns; automatic line uses metal pattern plates for long-run durability.
Start with manual for samples, then transition to automatic for volume production — same tooling geometry, optimized cost.
Quality sand castings manufactured for global OEM and industrial clients across iron, aluminum, brass, and steel alloys.
Steel Sand Casting — Machined + Painted
A356 Aluminum Motor Housing — T6 Heat Treated + CNC Machined
| China Standard | ASTM / EN Equivalent | Tensile (MPa) | Typical Applications |
|---|---|---|---|
| HT150 | ASTM A48 Class 20 / EN-GJL-150 | 150 | Covers, light housings |
| HT200 | ASTM A48 Class 30A / EN-GJL-200 | 200 | Machine bases, housings |
| HT250 | ASTM A48 Class 35A / EN-GJL-250 | 250 | Cylinder blocks, flywheels |
| HT300 | ASTM A48 Class 40A / EN-GJL-300 | 300 | Heavy-duty gear cases |
| HT350 | ASTM A48 Class 45A | 350 | High-strength machine beds |
| China Standard | ASTM / EN Equivalent | Tensile (MPa) | Typical Applications |
|---|---|---|---|
| QT400-18 | ASTM 60-40-18 / EN-GJS-400-18 | 400 | Pressure-rated valve bodies |
| QT400-15 | EN-GJS-400-15 | 400 | Hydraulic components |
| QT450-10 | EN-GJS-450-10 | 450 | General engineering parts |
| QT500-7 | ASTM 65-45-12 / EN-GJS-500-7 | 500 | Pump casings, brackets |
| QT600-3 | ASTM 80-55-06 / EN-GJS-600-3 | 600 | Crankshafts, connecting rods |
| QT700-2 | EN-GJS-700-2 | 700 | High-load structural parts |
| Alloy | Equivalent | Key Properties | Typical Applications |
|---|---|---|---|
| Al319 / ZL107 | ZL107 | Good castability | Engine components, housings |
| A356.0 | ZL101 | Best strength + ductility | Structural, automotive |
| A413.0 / LM20 | ZL102 | Excellent fluidity | Thin-wall, complex shapes |
| A336.0 | AlSi12Cu | Good wear resistance | Pistons, cylinder liners |
| 6061 / 6062 / 6063 | — | Wrought grade, T6 available | Machined components |
| Material | Type | Key Property | Typical Applications |
|---|---|---|---|
| C360 Brass | Free-machining | Best machinability | Fittings, valves |
| C260 Brass | Cartridge brass | High ductility | Decorative hardware |
| C464 Naval Brass | Marine grade | Seawater resistance | Marine propellers, fittings |
| Tin Bronze | Bronze | Wear resistance | Bearings, bushings |
| Silicon Bronze | Bronze | Corrosion resistance | Pump impellers |
| Aluminum Bronze | Bronze | High strength | Heavy-duty gears, structural |
| Manganese Bronze | Bronze | High load bearing | Propellers, worm gears |
| Brass parts from a few grams up to 50 lbs — available via sand casting or investment casting process |
| Grade | Standard | Application | Notes |
|---|---|---|---|
| ZG230-450 | GB/T 11352 | General structural | Good weldability |
| ZG270-500 | GB/T 11352 | Load-bearing parts | Medium strength |
| ZG310-570 | GB/T 11352 | High-strength parts | Heat treatable |
| G4140 (42CrMo) | ASTM A732 | High-stress components | Alloy steel |
| WCB | ASTM A216 | Valves, flanges | Carbon steel |
| CF8 / CF8M | ASTM A351 | Stainless (304/316) | Corrosion resistant |
Renyi operates both automatic and manual moulding lines. The right choice depends on your order quantity, part size, and budget.
| Criteria | Automatic Line | Manual Line |
|---|---|---|
| Volume | 500 – 100,000+ pcs | 10 – 500 pcs |
| Unit Cost | Lower per piece | Higher per piece |
| Tooling | Metal pattern plate | Wood / resin pattern |
| Sample Lead | 2–3 weeks | 1–2 weeks |
| Consistency | Excellent | Good |
| Max Weight | Up to 200 kg | Up to 10 T |
| Best For | OEM repeat orders | Prototypes, large parts |
Max Part Weight
Casting Tolerance Grade
Standard T1 Sample
Urgent Sample Lead Time
Shot Blasting
Sand Blasting
Powder Coating
Chrome Plating
Mirror Polish
Painting
T6 Heat Treatment
Impregnation
Passivation
From pattern design to finished, inspected component — a clear, controlled workflow at every stage.
01
Pattern designed with draft angle, shrinkage allowance, and machining stock; made from wood, resin, or metal
02
Sand is packed around the pattern via automatic or manual line; cope and drag assembled to form complete mould
03
Sand cores placed inside the mould to create internal passages, cavities, and complex internal geometries
04
Molten metal poured into the mould at controlled temperature and speed; gating system directs metal flow
05
Metal solidifies and cools; the sand mould is broken away (shakeout) to reveal the raw casting
06
Gates and risers removed; shot blasting, machining, surface treatment, and dimensional inspection before shipment
From raw sand castings to fully finished, assembled products — we handle the entire chain so you deal with one supplier.
Raw sand casting to fully finished product
Precision CNC machining (turning, milling, drilling, tapping)
T6 heat treatment for aluminum alloys
Impregnation treatment for pressure-tight requirements
Powder coating (RAL color matching available)
Chrome plating, painting, and specialty finishes
Shot blasting and sand blasting surface prep
Sub-assembly and kitting services
In-house pattern making and tooling workshop
Consistent quality backed by ISO 9001 QMS
In-house pattern making workshop produces wood, resin, and metal patterns with shrinkage and draft angle optimization.
Vacuum impregnation seals micro-porosity for castings requiring pressure-tight or leak-proof performance.
Non-destructive testing including X-ray, UT, and MT inspection for safety-critical or structural castings.
We assemble inserts, bushings, O-rings and sub-components — shipping ready-to-install units to your line.
Renyi sand castings serve customers across major industries — wherever reliable, cost-effective metal components are required in a wide range of sizes and materials.
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- Engine blocks & heads
- Transmission housings
- Brake drums & discs
- Differential housings
- Exhaust manifolds
🏗️
- Crusher wear parts
- Mill liners & grinding media
- Pump casings (large)
- Impellers & wear plates
- Conveyor components
🛢️
- Valve bodies & bonnets
- Pipe flanges
- Pump casings
- Impeller & diffuser
- Pressure housings
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- Turbine housings
- Generator end brackets
- Motor frames
- Transformer parts
- Wind turbine components
There is no strict MOQ. Manual moulding makes sand casting economical from as few as 10–20 pieces. For automatic line production, 500+ pieces per run yields the best unit cost.
Standard project: tooling + T1 samples within 30–40 days. Urgent projects can be completed in 20 days. RFQ feedback within 12 hours, full quotation within 48 hours.
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.
Our engineers review your part drawing, operating conditions, and budget to recommend the optimal material. We cover four families — cast iron, aluminum, brass/bronze, and cast steel — and will suggest the best sand process (green, resin, or shell mold) accordingly.
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, required quantity, and surface finish requirements. Our engineers will select the best sand casting process and moulding method for your application.
Process recommendation (green sand / resin / shell mold)
Moulding line selection (auto vs. manual) based on quantity
Tooling cost + unit price quoted separately
Material certifications and full inspection reports included
Iron, aluminum, brass, or steel — small prototype or large production run — send drawings (STEP / DXF / PDF) to us — response within 12 hours.