ISO K — Cast Iron · K40
K40 — Compacted graphite iron
Hardness range: 160–250 HB. Part of the ISO K — Cast Iron group. Cast iron is abrasive and brittle — short chips, no built-up-edge. CVD alumina (Al₂O₃) coatings resist the high-temperature abrasion. Dry machining is acceptable for grey iron; coolant helps with nodular grades. Main failure mode: flank wear. High-speed machining is effective.
Material profile — K40
- ISO designation
- K40 (ISO K — Cast Iron)
- Material
- Compacted graphite iron
- Hardness
- 160–250 HB
- ISO group colour
- Cast Iron
Tooling guidance — K-group
- Group summary
- CVD alumina coatings excel. Dry machining acceptable for grey CI. Abrasive wear is the main failure mode.
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