CIS (formerly Japan Cemented Carbide Tool Manufacturer's Association Standards) Class Symbols and Adjustments
Adjustment table of CIS material grades standard and our grades
| Division | Our grades | CIS classification | ||
|---|---|---|---|---|
| New | Old | |||
| For wear and impact resistant tools | H1 | VM-10 | V10, K01 | |
| G1 | VM-20 | V10, K10 | ||
| G2 | VM-30 | V20, K20 | ||
| G3 | VM-40 | V30, K30 | ||
| G4 | VC-40 | V30, K30 | ||
| G5 | VC-50 | V40 | ||
| TB6 | VU-60 | V40 | ||
| TB7 | VU-70 | V50 | ||
| G8 | VU-80 | V60 | ||
| For high wear-resistant | SS13 | VF-10 | ― | |
| SS15 | VF-10 | ― | ||
| Nonmagnetic cemented carbide | KN20 | NF-40 | V30 | |
| For cutting tools | KW3 | VM-30 | K20 | |
| Fine-grain cemented carbide | KD05 | VF-20 | V20 | |
| KD10 | VF-30 | V20 | ||
| KD20 | VF-40 | V30 | ||
| KD40 | VF-50 | V40 | ||
| Micro-grain cemented carbide | EF01 | VF-10 | Z01 | |
| EF05 | VF-10 | Z01 | ||
| EF10 | VF-20 | Z10 | ||
| EF20 | VF-40 | Z30 | ||
| For stainless steel | KX01 | VF-20 | Z10 | |
| For stamping pure iron and copper | MC20 | VC-40 | V20 | |
| For EDM | Crack resistance | A10W | VM-30 | V20 |
| Corrosion resistance | WD20 | VF-40 | V30 | |
| ME40 | VC-50 | V30 | ||
CIS Class Symbols
Table1 Classification method of 1st digit
| Mark | Binder phase elements |
|---|---|
| V | Co |
| R | Co/Ni |
| N | Ni |
Table2 Classification method of 2nd digit
| Mark | WC average grain size※ |
|---|---|
| F | Less than1.0 |
| M | Between 1.0 and 2.5 |
| C | Between 2.5 and 5.0 |
| U | More than 5.0 |
Table3 Classification method of 4th and 5th digit
| Mark | Nominal hardness HRA※ |
|---|---|
| 10 | 93 or more |
| 20 | Between 92 and 93 |
| 30 | Between 91 and 92 |
| 40 | Between 89 and 91 |
| 50 | Between 87 and 89 |
| 60 | Between 85 and 87 |
| 70 | Between 82 and 85 |
| 80 | Less than 82 |
※*Table 1-3 are quoted from CIS Standard 019D-2005