PRODUCTS
Rock Hollow Steel
We pride ourselves on providing high-quality steel that meets the rigorous demands of the drilling industry. Our commitment to innovation and quality ensures that our clients receive the best materials for their tools, contributing directly to their operational success.
Advantages
Our drill steels for efficient, economical production and longer service life!
High fatigue strength and toughness
High resistance to wear and permanent distortion
Properties that enable efficient and economic production
Close tolerances for automated manufacturing process
A uniform response to heat treatment
Uniform straightness, eliminating the need for straightening
Product Quality
Raw Material Selection
Product quality begins at the very start of the process, where raw material is carefully selected for melting in our 75 tonnes electric arc furnace.
Continuous Bloom Casting
The continuous, three stand bloom caster gives us several quality advantages compared to ingot casting — including superior control of:
✦ Non-metallic inclusions ✦ Purity
✦ Material structure ✦ Surface finish
Drilling & Core Insertion
Long-hole drilling and the insertion of a core in the drill steel blank, prior to rolling, produce straight centre holes with close dimensional tolerances. After rolling, the core is withdrawn.
Surface Turning
In order to eliminate decarburisation and other defects, the surface is turned before the final rolling process — ensuring a clean, defect-free finish.
Controlled Cooling Process
After rolling, a carefully controlled cooling process guarantees the final and uniform mechanical properties throughout the bar.
Our Products
Sanbar 20
95CrMo
A high strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance in the as-rolled condition.
Application
Integral drill steels primarily (pilot rods and tapered rods).
Mechanical Properties
Sanbar 23
High Chromium Molybdenum Alloy Steel
An air hardening, high chromium, molybdenum alloy steel with good response to surface induction hardening, suitable for carburising. High fatigue strength and wear resistance in the case hardened condition.
Application
Extension rods, shank rods, (tapered rods).
Mechanical Properties
Sanbar 61
40SiMnCrNiMo
A high strength silicon steel with good toughness and impact resistance in the as-rolled condition.
Application
Tapered rods primarily (pilot rods and integral drill steels).
Mechanical Properties
Sanbar 64
23CrNi3Mo
An air-hardening, high nickel alloy steel with good response to carburising. Excellent fatigue strength and wear resistance in the case hardened condition.
Application
Extension rods, shank rods, (tapered rods).
Mechanical Properties
Chemical Composition
All values shown as weight percentage (%) — typical nominal composition
| Steel Grade | C | Mn | Si | Ni | Cr | Mo | V |
|---|---|---|---|---|---|---|---|
| 95CrMo SANBAR 20 | 0.90–1.00 | 0.15–0.40 | 0.15–0.40 | — | 0.80–1.20 | 0.15–0.30 | — |
| SANBAR 23 | 0.24 | 0.5 | 0.3 | — | 3.1 | 0.5 | — |
| 40SiMnCrNiMo SANBAR 61 | 0.37–0.43 | 0.80–1.10 | 1.30–1.60 | 0.40–0.60 | 0.60–0.90 | 0.20–0.40 | — |
| 23CrNi3Mo SANBAR 64 | 0.19–0.26 | 0.55–0.75 | 0.15–0.35 | 2.75–3.10 | 1.15–1.45 | 0.20–0.30 | — |
| 55SiMnMo | 0.50–0.60 | 0.60–0.90 | 1.10–1.40 | — | — | 0.40–0.55 | — |
| 35SiMnMoV | 0.32–0.41 | 1.30–1.60 | 0.60–0.90 | — | — | 0.40–0.60 | 0.07–0.15 |
| 80Cr | 0.75–0.85 | ≤0.35 | ≤0.35 | — | 1.40–1.65 | ≤0.15 | — |
| 24SiMnCrNi2Mo FF710 | 0.21–0.27 | 1.20–1.50 | 1.30–1.70 | 1.65–2.00 | 0.25–0.35 | 0.30–0.40 | — |
Dimensions
Other sizes are available on request. H = Hexagon | R = Round
Hexagonal Hollow Steel
Metric Units (mm / kg/m)| Type | Counter Diameter | Hole Diameter | Eccentricity (mm) |
r (mm) |
Weight (kg/m) |
||
|---|---|---|---|---|---|---|---|
| size (mm) | tolerance (mm) | size (mm) | tolerance (mm) | ||||
| H19 | 19.0 | +0.3−0.2 |
6.0 | +0.7−0.8 |
0.5 | 2.5 | 2.21 |
| H22 | 22.2 | +0.3−0.2 |
6.7 | +0.7−0.8 |
0.6 | 3.0 | 3.05 |
| H25 | 25.3 | +0.4−0.2 |
7.6 | +0.8−0.7 |
0.7 | 3.0 | 3.97 |
| H28 | 28.6 | +0.5−0.3 |
8.8 | +0.8−0.7 |
0.8 | 3.5 | 5.05 |
| H32 | 32.1 | +0.6−0.2 |
9.5 | +0.8−0.7 |
0.9 | 4.0 | 6.36 |
| H35 | 35.3 | +0.6−0.3 |
9.5 | +0.8−0.6 |
1.0 | 4.0 | 7.86 |
Round Drill Steel
Metric Units (mm / kg/m)| Type | Outside Diameter | Hole Diameter | Eccentricity (mm) |
Weight (kg/m) |
||
|---|---|---|---|---|---|---|
| size (mm) | tolerance (mm) | size (mm) | tolerance (mm) | |||
| R32 | 32.2 | +0.7−0.3 |
9.2 | +0.8−0.8 |
0.7 | 5.83 |
| R39− | 39.0 | +0.8−0.3 |
13.0 | +1.2−1.2 |
1.0 | 8.27 |
| R39 | 39.0 | +0.8−0.3 |
14.5 | +1.2−1.2 |
1.0 | 8.02 |
| R46− | 45.8 | +0.8−0.3 |
15.0 | +1.5−1.2 |
1.2 | 11.46 |
| R46 | 45.8 | +0.8−0.3 |
17.0 | +1.5−1.2 |
1.2 | 11.07 |
| R52− | 52.0 | +1.0−0.0 |
19.0 | +1.5−1.2 |
1.4 | 14.35 |
| R52 | 52.25 | +1.0−0.0 |
21.5 | +1.5−1.2 |
1.4 | 13.72 |
Sizes and Tolerances
Imperial Units (inch / lb/ft)| Denomination | Nominal Bar Size (inch) | Tolerance (inch) | Hole Dia. incl. Ovality (inch) | Eccentricity¹ max (inch) | Random² Length ft (±10%) | Weight (lb/ft) |
|---|---|---|---|---|---|---|
| H 7/8 | 0.872 | +0.007−0.006 |
0.263 ± 0.015 | 0.023 | 24.6 – 27.8 | 2.05 |
| H 1 | 0.996 | +0.011−0.005 |
0.338 ± 0.019 | 0.027 | 24.6 – 27.8 | 2.60 |
| H 1 1/8 | 1.125 | ± 0.009 |
0.346 ± 0.019 | 0.027 | 18.0 – 21.3 | 3.39 |
| H 1 1/4 | 1.261 | +0.013−0.009 |
0.377 ± 0.023 | 0.031 | 26.2 – 29.5 | 4.28 |
| H 1 1/4 | 1.261 | +0.013−0.009 |
0.476 ± 0.027 | 0.031 | 27.8 – 31.1 | 4.06 |
| H 1 3/8 | 1.389 | ± 0.011 |
0.374 ± 0.023 | 0.039 | 29.5 – 32.8 | 5.29 |
| H 1 1/2 | 1.507 | ± 0.013 |
0.629 ± 0.031 | 0.039 | 29.5 – 32.8 | 5.61 |
| R 1 1/4 | 1.267 | ± 0.011 |
0.362 ± 0.019 | 0.029 | 29.5 – 32.8 | 3.94 |
| R 1 1/4 | 1.267 | ± 0.011 |
0.460 ± 0.023 | 0.029 | 24.6 – 27.8 | 3.72 |
| R 1 1/2 | 1.535 | ± 0.011 |
0.405 ± 0.023 | 0.031 | 19.6 – 22.9 | 5.85 |
| R 1 1/2 | 1.535 | ± 0.011 |
0.570 ± 0.031 | 0.039 | 19.6 – 22.9 | 5.42 |
| R 1 3/4 | 1.803 | ± 0.015 |
0.669 ± 0.035 | 0.047 | 32.8 – 36.0 | 7.48 |
| R 2 1/32 | 2.049 | ± 0.017 |
0.846 ± 0.039 | 0.062 | 22.9 – 26.2 | 9.29 |
| R 2 23/64 | 2.362 | ± 0.027 |
0.889 ± 0.086 | 0.068 | 22.9 – 26.2 | 12.78 |
¹ Eccentricity = the distance between the centre of the bar and the centre of the hole.
² Fixed cut lengths are available on request.
Supply Specifications
Forms of Supply
Rock drill steel is supplied as hollow, hot-rolled, round or hexagon bar. The ends are trimmed square to within 0.15 mm (0.006 in) maximum. The outer surface can be supplied dry or oiled for protection against corrosion during transport. The flushing holes are normally sealed with plastic caps. Bars are supplied in standard bundles containing max 1,500 kg (3,300 lbs).
Surface Condition
Both outer and inner surfaces are free from harmful slag marks, cracks and scratches. Maximum depth of defects:
Straightness
Maximum deviation is:
Decarburisation
The maximum permissible decarburisation depth:
How to Order
To ensure fast and accurate delivery of rock drill steel, we recommend that your order contains the following information:
※ Any special requirements regarding tolerances, lengths, maximum bundle weight, or corrosion protection should also be stated in your order.
Ready to Place Your Order?
Our team is ready to help you find the right drill steel solution for your project. Contact us today for a fast, accurate quote.
Send Us an Enquiry [email protected]