SN represents “Store Norfors”. The name originates from their first application in Store Norfors in Sweden. An alternative etymology attributes SN to “soil & Nail”.
People call rock bolt as SN-Bolt, SN Rock Bolt, SN Anchor, which is used for mining, tunneling and specialized civil engineering. The whole set of SN bolt consists of a thread bar, s plate, a spherical washer and a nut.
There are three major ways of anchoring the rock bolts: mechanical, grouted, and friction. The most common grout-anchored rock bolt is the fully grouted rebar, a threaded bar made of steel. Cement or resin is used as the grouting agent. A cable bolt is a reinforcing element made of steel wires in the form of a strand or rope; it is installed in the borehole with cement grout.
Super high duty, ultra high strength heat treatment rock bolt/ anchor bolt/ roof support system is an advanced steel products with prime quality and high performance, which can ensure the anchoring effect for complex ground conditions, such as sand and gravel to inconsistent fill, boulders, rubble and weathered rock. Raw materials are hot rolled steel rebars or deformed bars, using inductive heat treating technology （our patent）. This product is widely used in tunneling, mining, slope stabilization and foundation support.
Our high duty high strength rock anchor bolt product have higher strength grade than normal hot-rolled rebars( for example, grade MG500,600,700,785,830 Mpa). This advantage of our product can decrease deformation of rocks, control or limit the breakage area in surrounding rock. It’s good anti-impact property can resist sudden impact pressure, which can ensure the security of mining operation.
MECHENICAL PROPERTIES
| Steel Grade | Yield Strength | Tensile Strength | Elongation After Fracture | Elongation under Max Force | Impact Absorb Energy | |
| Rel/MPa | Rm/MPa | A/% | Agt/% | kv2/J | ||
| NOT LESS THAN | ||||||
| Industrial Standard | MG335/MG400 | 335 | 500 | 15 | 40 | |
| MG500 | 500 | 700 | 22 | 100 | ||
| Our company Standard | 600 | 600 | 750 | 19 | 9 | 90 |
| 700 | 700 | 850 | 17 | 7.5 | 80 | |
| 785 | 785 | 930 | 16 | 5.5 | 60 | |
| 830 | 830 | 1030 | 15 | 4.5 | 50 | |
GENERAL DIMENSION
| Suface Type | Nominal DiameterDn/mm | Nominal Cross SectionSn/m㎡ | Weight per meterg/m | Top strength levelMPa |
| Levorotation, no longitudinal rib |
16 | 201.06 | 1578 | 800 |
| Levorotation, no longitudinal rib |
18 | 254.47 | 1998 | 800/1080 |
| Levorotation, no longitudinal rib |
20 | 314.16 | 2466 | 800 |
| Levorotation, no longitudinal rib |
22 | 380.13 | 2984 | 800 |
| Levorotation, no longitudinal rib |
25 | 490.88 | 3853 | 800/1080 |
| Levorotation, no longitudinal rib |
28 | 615.75 | 4834 | 800 |
| Levorotation, no longitudinal rib |
32 | 804.25 | 6313 | 800/1080 |
PRODUCTION PROCESS
1. 600MPa ~ 700MPa
Raw material — Heat Treatment — Mechanical Property Test — Sawing/Cutting — Reduce diameter — Screw thread — Test — Packaging — Stock in
2. 335MPa ~ 500MPa
Raw Material — Reduce diameter — Screw thread — Test — Packaging — Stock in
APPLICATION
- Coal mining
- Hard rock mining
- Civil construction
- General construction
- Geotechnical and Shoreline
- Bridges
- Dams
- Infrastructure
- Tunnels
SAFETY CERTIFICATE OF APPROVAL FOR MINING PRODUCTS
MODEL/TYPE : MSGLW-335/16,18,20,22,25
MSGLW-400/16,18,20,22,25
MSGLW-500/16,18,20,22,25
MSGLW-600/16,18,20,22,25
MSGLW-700/16,18,20,22,25
More information for our certificates, please contact [email protected]. Thank you!
Post time: Aug-26-2019