HT Grade System
16 grades | Co 6-16% | WC grain 1.6-6.0 µm
Naming Convention
HT+Co %+Grain Size (µm × 10)+Suffix
Example
HT0616T
6% Co, 1.6 µm WC grain, toughness-optimized
Suffix Explanations
T
Toughness
Optimized for impact resistance
E
Enhanced cobalt +0.5%
Additional binder for ductility
R
Recycled feedstock
Produced from recycled WC-Co
Grain Size Classification
Nano
< 0.2 µm
Ultrafine
0.2 - 0.5 µm
Submicron
0.5 - 0.9 µm
Fine
0.9 - 1.3 µm
Medium
1.3 - 2.5 µmHT Range
Coarse
2.5 - 5.0 µmHT Range
Extra Coarse
> 5.0 µmHT Range
Medium Grain Grades
WC grain size 1.6 - 2.4 µm — balanced hardness and toughness for general-purpose drilling.
| Grade | Co (%) | WC Grain | Density (g/cm3) | HRA | TRS (MPa) |
|---|---|---|---|---|---|
| HT0616 | 6% | 1.6μm | 14.94 | 90.2 | 2700 |
| HT0616T | 6% | 1.6μm | 14.92 | 90.2 | 3000 |
| HT0716T | 7% | 1.6μm | 14.84 | 89.2 | 2800 |
| HT0816 | 8% | 1.6μm | 14.72 | 88.9 | 2850 |
| HT1016 | 10% | 1.6μm | 14.51 | 88.3 | 2950 |
| HT1024 | 10% | 2.4μm | 14.52 | 87.5 | 2850 |
| HT1124E | 11.5% | 2.4μm | 14.38 | 87.0 | 2900 |
| HT1324 | 13% | 2.4μm | 14.21 | 86.4 | 2900 |
| HT1616 | 16% | 1.6μm | 13.94 | 86.6 | 3100 |
| HT1624 | 16% | 2.4μm | 13.94 | 85.5 | 2950 |
Coarse Grain Grades
WC grain size ≥ 3.2 µm — superior impact resistance for demanding percussive drilling.
| Grade | Co (%) | WC Grain | Density (g/cm3) | HRA | TRS (MPa) |
|---|---|---|---|---|---|
| HT0632E | 6.5% | 3.2μm | 14.90 | 88.5 | 2800 |
| HT0640 | 6% | 4.0μm | 14.93 | 87.6 | 2300 |
| HT0850E | 8.5% | 5.0μm | 14.66 | 86.3 | 2350 |
| HT0860E | 8.5% | 6.0μm | 14.66 | 85.7 | 2150 |
| HT0940 | 9% | 4.0μm | 14.61 | 86.2 | 2350 |
| HT1040 | 10% | 4.0μm | 14.51 | 85.9 | 2400 |