Custom Iron Casting Foundry & Manufacturer
Grey iron and ductile iron castings engineered to your drawing, sample, or spec — from single-piece prototypes to full production runs. Nothing is sold from stock.
Request a Free QuoteBuilt Around Custom Parts, Not Catalog Parts
Kurt Foundry is a custom iron casting foundry and manufacturer running green sand and furan resin sand casting lines dedicated entirely to custom iron castings. Send a drawing, a sample, or a target spec, and our metallurgists turn it into a casting plan — alloy, pattern, gating, and heat treatment included.
Two iron families cover most industrial applications: grey iron for damping and cost efficiency, ductile iron for strength and impact resistance. Both are cast, machined, inspected, and packed under one roof at our foundry in Weifang, Shandong.
Grey Iron or Ductile Iron
Both materials run through the same sand casting process at Kurt Foundry. The right choice depends on whether your part needs damping and cost efficiency, or strength and impact resistance.
Grey Iron Castings
Best for vibration damping, wear resistance, and lower per-kilogram cost — machine bases, housings, and brackets under steady load.
View Grey Iron Grades
Ductile Iron Castings
Best for load-bearing and shock-loaded parts. Nodular graphite structure gives steel-like strength with casting-level cost.
View Ductile Iron GradesNot Sure Which Material Fits?
Send your drawing and load case — a foundry engineer will recommend grey iron or ductile iron before you commit to tooling.
Submit Your InquiryCast From 1 kg to 1,000 kg
Kurt Foundry sizes each mold and pouring run to the part itself, not to a fixed product line. Small brackets and large housings move through the same custom-casting workflow.
- Single castings from 1 kg up to 1,000 kg per piece
- Wall thickness and section size reviewed at quoting stage
- Pattern tooling sized to your part, not a standard mold set
Start From a Drawing, a Sample, or a Spec
No design file yet is not a blocker. Kurt Foundry works from 2D or 3D CAD drawings, from a physical sample for reverse engineering, or from a written performance requirement.
- 2D/3D CAD drawings accepted directly into pattern design
- Reverse engineering from a physical sample
- Single-piece prototype casting before committing to production
Low Minimum Order Quantities
Prototype and sample orders start at a single piece. For bulk production, quantity is confirmed by inquiry based on part size and complexity — our minimum runs below most foundries in the region.
- Prototype and sample orders: 1 piece
- Bulk production: minimum order confirmed by inquiry
- MOQ set lower than typical industry minimums
±0.1 mm CNC Tolerance, Full Machining Available
Castings leave the sand mold as rough blanks. From there, parts can stay as-cast, receive selective machining on critical faces, or go through full precision machining to final assembly dimensions.
- CNC machining tolerance held to ±0.1 mm
- As-cast, semi-machined, or fully machined finish levels
- Machining done in-house after casting and heat treatment
Alloy Chemistry Matched to Your Grade Standard
Chemical composition is adjusted per pour to hit your specified grade, checked against international standards before the mold is filled.
- Grey iron: ASTM A48, EN-GJL, JIS FC grade families
- Ductile iron: ASTM A536, EN-GJS, JIS FCD grade families
- Spectrometer testing confirms composition before pouring
Packed and Shipped to Your Route
Export packaging is built around how the part travels — wooden crates for heavy or long-distance freight, palletized cartons for smaller parts, and moisture protection for ocean freight.
- Packaging spec set by part weight, size, and shipping method
- FOB and DDP terms available
- Export documentation and material certificates included
Cast Iron vs Cast Steel
Iron and steel castings are made through similar sand casting processes, but perform differently under load, vibration, and cost pressure.
| Property | Cast Iron (Grey / Ductile) | Cast Steel |
|---|---|---|
| Vibration damping | High, especially grey iron | Low |
| Tensile strength | Moderate to high (ductile iron) | Higher, more consistent |
| Impact / shock resistance | Good in ductile iron, limited in grey iron | High |
| Machinability | Generally easier to machine | Harder, more tool wear |
| Casting cost per kg | Lower | Higher, higher melting point |
| Typical use | Machine bases, housings, brackets, pump bodies | Structural parts under high stress, mining, rail |
How a Custom Order Moves Through Our Foundry
Every custom iron casting — whichever material, weight, or grade you specify — passes through the same four production stages before it ships.
Pattern, Mold & Grade Setup
Your drawing, sample, or spec is converted into pattern tooling, and the alloy chemistry is set to your specified grade before the first mold is made.
Melting & Pouring
Iron is melted and composition-tested by spectrometer, then poured into the mold at the correct temperature for a dense, defect-free casting.
Cooling & CNC Machining
Castings cool, shake out, and move to in-house CNC machining — as-cast, semi-machined, or fully machined to ±0.1 mm, per your spec.
Inspection & Export Packing
Dimensional and material inspection against your drawing, then export packaging matched to your shipping route.
Have a Drawing Ready? Talk to Kurt Foundry.
Send your 2D or 3D file — a foundry engineer will confirm castability and return a firm quote within 48 hours.
Submit Your InquiryWhat Does a Custom Iron Casting Cost?
Pricing depends on material, grade, weight, and machining scope. Use the ranges below as a starting point — your exact quote depends on the drawing.
As-Cast / Minimal Finishing
Shot-blasted and dimensionally inspected, delivered as a raw or lightly finished casting for your own downstream machining.
Fully CNC Machined
Complete CNC machining, drilling, and tapping to ±0.1 mm — ready for immediate assembly on arrival.
Industries Running on Our Castings
Made-to-order grey iron and ductile iron components across agriculture, fluid handling, and heavy machinery.
Agricultural Machinery
Gearbox housings, tillage parts, and structural brackets for field equipment.
Counterweights
Elevator, crane, and construction equipment counterweights cast to precise weight and dimensional tolerances.
Bearing Housings
Pillow blocks and custom bearing housings for shaft alignment under load.
View Details
Clutch & Gearbox Housings
Precision-machined clutch and gearbox housings for power transmission assemblies.
Tested Before It Leaves the Foundry
Chemical composition
Spectrometer testing on every melt confirms alloy grade before pouring.
Mechanical testing
Tensile strength and hardness testing against the specified grade standard.
Dimensional inspection
CMM and manual inspection against drawing tolerances before packing.
ISO 9001 certified
Kurt Foundry operates under ISO 9001 certified quality management.
What Our Clients Say
Custom iron castings shipped from Kurt Foundry to buyers across six continents.
Kurt Foundry held tolerance on our bearing housings better than our previous supplier, and the prototype-to-production process was straightforward.
We switched from cast steel to ductile iron for our valve housings on their recommendation and cut both weight and cost without losing strength.
Low minimum order and a fast prototype turnaround made it easy to test a new casting design before committing to volume.
Machined dimensions came in within spec on every part, and the material certs made customs clearance simple.
One Supplier. Casting to Finished Part.
Kurt Foundry runs dedicated casting lines for custom iron castings at our Shandong-based foundry. From pattern making through CNC machining and final inspection, every step is handled in-house.
Buyers receive material test reports, spectrometry data, and CMM dimensional reports with each shipment. No third-party lab delays.
We ship on DDP or FOB terms to buyers in North America, Europe, Southeast Asia, and the Middle East. Lead time and freight options are confirmed at the quotation stage.
- Casting Weight: 1 kg – 1,000 kg per Piece
- In-House CNC Machining to ±0.1 mm & CMM Inspection
- Pre-Pour Spectrometry & Composition Verification
- DDP / FOB Shipping to North America, Europe & Beyond
- Material Certs & Inspection Reports with Every Order
Custom Iron Casting FAQs
It depends on the load. Grey iron suits parts needing vibration damping and lower cost, such as machine bases. Ductile iron suits parts under impact or tensile load, such as brackets and housings that see shock loading. Send your drawing and load case and we recommend a grade.
Prototype and sample orders start at a single piece. Bulk production minimums are confirmed by inquiry based on part size and complexity, and are set lower than typical foundry minimums in the region.
Yes. Parts can ship as-cast, semi-machined, or fully machined to final assembly dimensions, with CNC tolerance held to ±0.1 mm.
Yes. Chemical composition and mechanical test reports are provided for each order, with dimensional inspection reports available on request.
Yes. We reverse engineer parts from a physical sample when no CAD drawing is available, and confirm dimensions with you before pattern making.
FOB and DDP terms are both available. Packaging is set based on part weight, size, and shipping method to protect castings in transit.
Ready to Quote Your Custom Iron Casting?
Submit 2D drawings, 3D CAD files, or a physical sample. A foundry engineer will confirm castability, recommend grey iron or ductile iron, and return a detailed quote within 48 hours.
Send Your RFQ Now