Drill steel developed for the manufacturing of top-hammer rock drill rods, available in various steel grades.
Alleima drill steel is characterized by a number of properties that enable efficient production:
- High fatigue strength and toughness
- High resistance to wear and permanent distortion
- Close tolerances (for automated manufacturing process)
- Uniform response to heat treatment
- Uniform straightness (eliminating the need for straightening)
Our rock drill steel can be supplied as hollow or solid, hot-rolled, round or hexagon bar.
| Grade | Description | Applications |
|---|---|---|
| Sanbar 20 | A high-strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance in the as-rolled condition. | Integral drill steels, pilot rods and tapered rods |
| Sanbar 23 | An air-hardening, high chromium-molybdenum alloy steel with good response to surface induction hardening and suitable for carburizing. It has high fatigue strength and wear resistance in the case-hardened condition. | Extension rods, shank rods and tapered rods |
| Sanbar 61 | A high-strength silicon steel with good toughness and impact resistance in the as-rolled condition. | Tapered rods, pilot rods and integral drill steels |
| Sanbar 64 | An air-hardening, high nickel alloy steel with good response to carburizing. It has excellent fatigue strength and wear resistance in the case hardened condition. | Extension rods, shank rods and tapered rods |
| Grade | Decarburization |
|---|---|
| Sanbar 20 | The maximum permissible decarburization depth is 0.20 mm (0.008 in.) on the outer surface and 0.10 mm (0.004 in.) on the inner surface. |
| Sanbar 23 | The maximum permissible decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.20 mm (0.008 in.) on the inner surface. |
| Sanbar 61 | The maximum permissible decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.10 mm (0.004 in.) on the inner surface. |
| Sanbar 64 | The maximum permissible decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.20 mm (0.008 in.) on the inner surface. |
| Grade | Proof strength Rp0.2 MPa (ksi) |
Tensile strength Rm Mpa (ksi) |
Hardness |
|---|---|---|---|
| Sanbar 20 | 850 (123) | 1300 (189) | 37-43 HRC |
| Sanbar 23 | 1000 (145) | 1350 (196) | 38-44 HRC |
| Sanbar 61 | 820 (119) | 1350 (196) | 38-44 HRC |
| Sanbar 64 | 900 (131) | 1250 (181) | 37-44 HRC |
*As-delivered condition