HSCC500 is a high strength, quenched and self-tempered steel designed for mining and civil construction applications. Available in commercial finish.
20TBAR is a hot-rolled, continuously threaded 20mm deformed bar.
Typical Application – Mine roof support.
WELDING
Prehead or post heat not required. Hydrogen controlled welding processes and electrodes such as GMAW, FCAW and low hydrogen MMAW must be used for all weld types. Matching strength W55x (E55x) or W62x (E62x) type consumables are required for all load-bearing butt welds.
Interpass temperature should be limited to 200oC maximum for all joints.
BILLET FEED Billet feed grade: 1AA1017, (Quench and Temper)
DIMENSIONS & MECHANICAL PROPERTIES
Sampling protocol as per L-QC-TM-75-RML01
Sections as per drawing SR28089 Rev E
Min
Nominal
Max
Barrel (mm)
19.3
19.5
19.7
Sides (mm)
18.6
19
19.5
T/B + Rib (mm) (OD)
22.2
22.5
22.8
Rib Height (mm)
1.35
1.45
1.55
Rib Spacing (mm)
9.8
10
10.2
Cross Roll (mm)
0
0
0.3
Note: Ensure all dimensions are within tolerance.
Each rib should be of uniform height along its length, with no ‘scallop’ and/or ‘tit’ present. Supervisor must be informed and the product placed on hold for re-inspection if any unevenness is detected. Use gauge for thread alignment check.
Min
Nominal
Max
Mass per metre (kg/m)
2.393
2.470
2.567
Shear cut – Shear cut shall be checked every hour by labman.
MECHANICAL PROPERTIES
Sampling protocol as per L-QC-TM-75-RML01
Cross Section Area: 300 mm at 19.54 mm nominal core diameter
Yield Stress (MPa): 540 min.
UTS (MPa) 600 min
EL (5d) (%): 16 min.
Shear Strength: (0.7 x UTS)
Length tolerance +50mm, -0
Nominal bundle mass 2.00 tonnes (+/-5%, range 1.90 – 2.10 tonnes)
Securing
7,010 mm to 12,000 mm length
5 wire ties equally spaced, end ties wire 300-500 mm from bundle ends
Tagging
One face tag per bundle, securely riveted to end of bar.
Tag Grade K1017 Face tag colour – White Bar End Colour Code- no colour code
ORDER INFORMATION
Description
CPN
Unit Weight Kg
Gewi Bar 2400x20mm Galv LHT
89451448
6.0kg
Gewi Bar 3000x20mm Galv LHT*
89466975
7.56kg
For further details please contact your closest Ground Support Representative
*Different length Gewi Bar can be ordered on request
