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Extra coarse-grained cemented carbide is a kind of cemented carbide with WC grain size larger than 6μm, compared with coarse grained cemented carbide, it has better toughness, thermal fatigue resistance and higher wear resistance. It is widely used in shield, mining, stamping die, cold heading die, roll and other industries under extreme working conditions, and the product reliability is greatly improved.For most carbide manufacturers, It is really difficult to process extra coarse-grained cemented carbide. In 2020, PM successfully processed a kind of extra coarse-grained cemented carbide with the grain size greater than 9 μm with better performance at the leading level in China.
SEM Micrograph of Extra Coarse-grained Cemented Carbide
| Category | Grain size of WC (μm) |
| Nano | < 0.2 |
| Ultrafine | 0.2 ~ 0.5 |
| Submicron | 0.5 ~ 0.8 |
| Fine | 0.8 ~ 1.3 |
| Medium | 1.3 ~ 2.5 |
| Coarse | 2.5 ~ 6.0 |
| Extra coarse | > 6.0 |
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| Shield Cutters | Rotary Picks | Spherical Buttons |
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