| Grade | Grain Size | Density (g/cm³) | Hardness (HRa) | T.R .S (N/mm²) |
|---|---|---|---|---|
| GC24 | Coarse | 14.5-14.7 | 88.1 | 2800 |
| GC25 | Coarse | 14.4-14.6 | 87.7 | 2800 |
How To Choose Carbide Buttons For DTH Bits
When selecting carbide buttons for DTH bits, we often make the decision based on the button shape. Different shapes have different features and perform differently when inserted in DTH bits with different faces. Basically, there are five shapes: conical, full ballistic, semi ballistic, crown point, and hemispherical. Here are some guidelines for selecting carbide button shapes.
- Conical and full ballistic buttons have a shorter lifetime and are susceptible to breaks due to their sharp heads.
- Crown point and hemispherical buttons have a longer lifetime and are less susceptible to breaks due to round heads.
- A DTH bit with more and smaller diameter carbide buttons results in faster penetration rates but a shorter lifetime of carbide buttons and the bit. Plus, for softer rock drilling.
- A DTH bit with fewer and larger diameter carbide buttons results in slower penetration rates but a longer lifetime of carbide buttons and the bit. Plus, for harder rock drilling and vibration increases.
