Metal material guide
Cast Iron CNC Machining Service
Cast iron components need the iron grade, casting condition and machining allowance defined before cutting. Grey iron, ductile iron and other types differ in structure and mechanical response.
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When Cast Iron fits — and when to pause.
Machine bases and housings
Damping and cast geometry may be useful when the casting route is already defined.
Loaded features
Ductile and grey iron require different design assumptions.
Existing castings
Datum strategy and stock allowance should be checked before machining.
Use a complete material designation.
The following examples are common ways buyers describe the family. They are not a stock list and they do not authorise substitution.
- Grey iron with governing grade specifiedConfirm supplier grade, condition, stock form and required documentation.
- Ductile iron with governing grade specifiedConfirm supplier grade, condition, stock form and required documentation.
RFQ material line
Cast Iron · iron grade, casting condition and stock allowance · stock form · quantity · required certificates · permitted substitutions.
If an application approval matters, name the regulation, edition and acceptance evidence.
Plan machining around the material behaviour.
Casting datum
Identify as-cast and machined datums plus stock allowance.
Porosity and skin
Define acceptance and how defects affect sealing or appearance.
Dust and edges
Plan safe machining and robust edge details.
Specify the final surface and dimensions.
Paint or coating
Define preparation, masked machined surfaces and corrosion expectations.
Black oxide or plating
Confirm suitability for the exact grade and geometry before specifying.
As-machined datum faces
State flatness, roughness and protective packaging.
Separate material identity from dimensional inspection.
Purchase specification, supplier documents, lot traceability and an agreed identification or test method where appropriate.
Drawing, datums, critical characteristics, inspection conditions and the required report format.
Use the relevant tester only when the drawing defines the parameter, method, location and acceptance range.
Reference and quotation boundary.
External material reference: Ductile Iron Society technical resources ↗
The source supports general material context. It does not establish Prolean stock, achievable tolerances, certification scope, price or delivery for a specific part. Those are confirmed in the quotation.
Technical review updated October 2026.
Cast Iron machining questions.
How should Cast Iron be specified for machining?
State the complete iron grade, casting condition and stock allowance, the stock form, permitted substitutions and required documents. Add the drawing, quantity, finish and inspection requirements.
Does a listed grade mean it is stocked?
No. The examples help structure an RFQ. Availability, substitutions, price and delivery are confirmed for the project.
How are tolerances confirmed?
Tolerances depend on geometry, material condition, feature size, quantity, finishing and inspection conditions. Mark critical dimensions and datums; the quote confirms what can be held.
Can material documents and inspection reports be supplied?
State the required certificate, traceability and dimensional or test report with the RFQ. The available document set and test method are confirmed before production.
Bring the drawing and material into one review.
Send the CAD model or drawing, quantity, material designation, service conditions, finish and acceptance requirements.
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- MaterialComplete grade, condition, stock form and documents.
- PartCritical dimensions, datums, finish and inspection.
- ProjectQuantity and requested delivery date.