Cast iron
Compacted Graphite Iron
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
CGI identifies graphite morphology; the cited foundry example is EN-GJV-400. It does not make every CGI casting a 450 MPa grade.
- Designation in this reference
- Compacted graphite iron (grade to be specified)
- Forms covered by the sources
- Compacted-graphite castings; EN-GJV-400 is one supplier example.
- States to distinguish or confirm
- Specify the grade, matrix, heat treatment and graphite acceptance criteria.
- Temperature and exposure
- No universal service-temperature limit or room-temperature property set is assigned. Use the cited product document and the purchase certificate.
Property evidence for a stated condition
No condition-specific numerical table is reproduced here
The linked sources establish the identity and the stated product/state scope. Obtain the row for your actual form, section, treatment and test conditions before adopting strength, hardness or a thermal limit.
Resolve these conditions next
- What product standard, edition and complete grade are on the material certificate?
- What product form, section size and delivery/heat-treatment condition will be machined?
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Sources and what they establish
Reviewed 23 October 2026. A source’s publication date and the review date are different. The scope below identifies the fields checked.
SinterCast compacted graphite iron overview
Graphite morphology and material-family identity; CGI is not one certified strength grade.
SinterCast compacted graphite iron overview ↗Schönlau compacted graphite iron products
Foundry-specific EN-GJV-400 product example, not all CGI grades.
Schönlau compacted graphite iron products ↗Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
- Replace the generic 450 MPa/220–280 HB material card with a family guide and require an actual grade before showing values.
- Withdraw the legacy generic hardness (217–269 HB) and tensile-strength (400 MPa (58 ksi)) pair: the old page does not establish a matching product, heat treatment, section and test source.
- Remove the unsupported cutting-speed table and machinability percentage; select tooling only after the actual material condition is known.
Distinguish other cast-iron structures
These white-iron references have different material identities from compacted graphite iron. Use their own sources for wear or machining decisions.