ISO 513 group H (Hardened steel & hard materials): workpiece materials, grades and selection
What ISO 513 group H covers
| Group | H — Hardened steel & hard materials (identification colour: grey) |
|---|---|
| Workpiece materials | Hardened steel (≈45–65 HRC), chilled and hardened cast iron. |
| Application band | H01 (fine finishing) – H30 (roughing) |
| Grade behaviour | Very high hardness pushes grades to the top of the hardness scale; cuts are typically light-depth, high-speed finishing passes generating red-hot chips. |
| Typical coating family | Fine-grain hard carbide grades and CBN-tipped solutions; coatings are thin and heat-resistant. |
| Selection guidance | Rigid setups, small nose radii or wiper geometries, negative geometry with strong edge prep; verify machine stability before hard turning. |
Group definition, identification colour and band numbering per ISO 513 (classification of carbides by use). Behaviour and coating notes are general engineering guidance, not manufacturer cutting data.
Grades catalogued for H cutting
No grades covering group H are catalogued yet. They are added as manufacturer catalogues are processed with source citations.
Inserts catalogued in this group
No models with a group H offering are catalogued yet — the grade tables on model pages fill in as catalogue data is verified.