ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
H | 38 | Hardened steel | Hardened | 55 HRC | 100-155 m/min |
H | 39 | Hardened steel | Hardened | 60 HRC | 90-135 m/min |
H | 40 | Chilled cast iron | Cast | 400 HB | 110-175 m/min |
H | 41 | Cast iron | Hardened | 55 HRC | 100-135 m/min |
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