ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
H | 38 | Hardened steel | Hardened | 55 HRC | 295-460 sfm |
H | 39 | Hardened steel | Hardened | 60 HRC | 260-395 sfm |
H | 40 | Chilled cast iron | Cast | 400 HB | 330-525 sfm |
H | 41 | Cast iron | Hardened | 55 HRC | 295-395 sfm |
|