In a large number of industries, square steel pipes are used. The production of this kind of pipes is increasing day by day. With compare to round steel pipes, square steel pipes are little more efficient. The reason is that the square column is more efficient than the solid circular column.
The alloy used for manufacturing square steel tubes is carbon steel. These steel tubes are used in structural projects, shelves, racks, trailers and in ornamental purpose. The framework made by square steel tubes, is used for providing support to the roof. This framework is also used as roof top ventilation baffles.
In a traditional space frame, for the bar members, circular hollow section members are used. At the joint section, by welding along a curve surface, the bar members are joined. Therefore, this process takes very long time and seems to be difficult. To make the problem easier, square steel pipes are used. The square steel pipes are used in a special configuration. Both the perpendicular sides of two square steel pipes are respectively aligned in perpendicular and parallel to the plane of the frame bodies. In this case, by butt-welding, the cross points of the bar members are joined along a short weld line.
| Squre Hollow Section |
Weight(Kg/Meter) |
| Wall Thickness |
0.9 mm |
1 mm |
1.2 mm |
1.5 mm |
2.0 mm |
2.5 mm |
3.0 mm |
4.0 mm |
5.0 mm |
6.0 mm |
| 10x10 |
0.27 |
0.29 |
0.35 |
0.42 |
- |
- |
- |
- |
- |
- |
| 12.50x12.50 |
0.34 |
0.37 |
0.44 |
0.54 |
- |
- |
- |
- |
- |
- |
| 15x15 |
0.41 |
0.45 |
0.54 |
0.66 |
- |
- |
- |
- |
- |
- |
| 20x20 |
0.55 |
0.61 |
0.73 |
0.9 |
1.17 |
1.43 |
1.68 |
- |
- |
- |
| 25x25 |
0.69 |
0.77 |
0.92 |
1.13 |
1.49 |
1.83 |
2.16 |
- |
- |
- |
| 30x30 |
0.84 |
0.93 |
1.11 |
1.37 |
1.81 |
2.23 |
2.63 |
- |
- |
- |
| 40x40 |
1.12 |
1.25 |
1.49 |
1.85 |
2.44 |
3.02 |
3.59 |
4.70 |
- |
- |
| 50x50 |
1.41 |
1.56 |
1.87 |
2.33 |
3.08 |
3.81 |
4.54 |
5.97 |
7.34 |
8.66 |
| 60x60 |
1.69 |
1.88 |
2.25 |
2.8 |
3.71 |
4.61 |
5.49 |
7.25 |
8.94 |
10.58 |
| 70x70 |
 |
4.36 |
5.34 |
6.47 |
8.53 |
10.53 |
12.49 |
| 75x75 |
4.67 |
5.8 |
6.92 |
9.13 |
11.29 |
13.4 |
| 80x80 |
4.98 |
6.19 |
7.4 |
9.76 |
12.08 |
14.34 |
| 85x85 |
- |
- |
7.90 |
10.44 |
12.93 |
15.36 |
| 90x90 |
- |
- |
8.38 |
11.08 |
13.72 |
16.32 |
| 100x100 |
6.25 |
7.78 |
9.3 |
12.3 |
15.25 |
18.15 |
| 105x105 |
- |
- |
9.82 |
12.99 |
16.12 |
19.19 |
| 110x110 |
- |
- |
10.30 |
13.62 |
16.91 |
20.15 |
| 120x120 |
- |
- |
11.21 |
14.84 |
18.43 |
21.96 |
| 125x125 |
- |
- |
11.73 |
15.54 |
19.31 |
23.02 |
| 140x140 |
- |
- |
13.17 |
17.46 |
21.70 |
25.89 |
| 150x150 |
- |
- |
14.12 |
18.73 |
23.29 |
27.80 |
|
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