Angle Irons

Hot Formed Equal Leg

There are many advantages to constructing with steel: the strength to weight ratio is excellent, metals join easily, efficient shapes are available, etc. These advantages create challenges that are best solved by a good understanding of how the metals actually perform in a structure. Structural steel shapes are suitable for a wide variety of uses. For example they are used in, building frames, roof trusses, floor framing, bench frames, gates, fences, cattle grids, scaffolds, tank stands, television towers, car trailers, rails, etc.

Most structural steel failures occur at connections, where a beam connects to a column, where a joist connects to a beam, etc. The Structural Engineer must design the steel members and give guidelines for the connections. The cold-formed sections are suitable for all types of welding, such as spot welding, seam welding, projection welding, butt and groove welding, plug welding and arc welding. All of these are applicable to both uncoated and zinc coated sections.

Different shapes of structural steel (both hot-rolled and cold-formed) are available with specifications such as:

Some structural steel shapes such as I-beams have a high second moments of area, which can result in stiffness compared to cross-sectional area. It is very important for engineers to have understanding of the material and its limitations.

Hot formed steel angle iron Equal leg

Angles (equal leg) dimensions and properties

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m r1 r2 A ax ay v1 v2
Designation h*b*t kg/m mm mm 103mm2 mm mm mm mm
25x25x3 1.11 3.5 2 0.142 7.21 7.21 10.2 8.77
5 1.77 3.5 2 0.226 7.98 7.98 11.3 9.10
30x30x3 1.36 5 2.5 0.174 8.35 8.35 11.8 10.5
5 2.18 5 2.5 0.278 9.18 9.18 13.0 10.7
40x40x3 1.87 6 3 0.235 10.7 10.7 15.2 14.0
4 2.42 6 3 0.308 11.2 11.2 15.8 14.0
5 2.97 6 3 0.379 11.6 11.6 16.4 14.1
6 3.52 6 3 0.448 12.0 12.0 17.0 14.3
45x45x3 2.13 7 3.5 0.268 11.9 11.9 16.7 15.7
4 2.74 7 3.5 0.349 12.3 12.3 17.4 15.8
5 3.38 7 3.5 0.430 12.8 12.8 18.1 15.8
50x50x3 2.37 7 3.5 0.298 13.1 13.1 18.5 17.5
4 3.06 7 3.5 0.389 13.6 13.6 19.2 17.6
5 3.77 7 3.5 0.480 14.0 14.0 19.0 17.6
6 4.47 7 3.5 0.569 14.5 14.5 20.4 17.7
8 5.82 7 3.5 0.741 15.2 15.2 21.6 18.0
60x60x4 3.70 8 4 0.471 16.0 16.0 22.6 21.0
5 4.57 8 4 0.582 16.4 16.4 23.2 21.1
6 5.42 8 4 0.691 16.9 16.9 23.9 21.1
8 7.09 8 4 0.903 17.7 17.7 25.0 21.4
10 8.69 8 4 1.11 18.5 18.5 26.1 21.7
70x70x6 6.38 9 4.5 0.813 19.3 19.3 27.3 24.6
8 8.36 9 4.5 1.06 20.1 20.1 28.5 24.8
10 10.3 9 4.5 1.31 20.9 20.9 29.6 25.1
80x80x6 7.34 10 5 0.935 21.7 21.7 30.7 28.1
8 9.63 10 5 1.23 22.6 22.6 31.9 28.3
10 11.9 10 5 1.51 23.4 23.4 33.0 28.5
12 14.0 10 5 1.79 24.1 24.1 34.1 28.9
90x90x6 8.30 11 5.5 1.06 24.1 24.1 34.0 31.5
8 10.9 11 5.5 1.39 25 25 35.3 31.7
10 13.4 11 5.5 1.71 25.8 25.8 36.5 31.9
12 15.9 11 5.5 2.03 26.6 26.6 37.6 32.2
100x100x8 12.2 12 6 1.55 27.4 27.4 38.7 35.2
10 15.0 12 6 1.92 28.2 28.2 39.9 35.4
12 17.8 12 6 2.27 29.0 29.0 41.1 35.7
15 21.9 12 6 2.79 30.2 30.2 42.7 36.1
120x120x8 14.7 13 6.5 1.87 32.3 32.3 45.6 42.0
10 18.2 13 6.5 2.32 33.1 33.1 46.9 42.4
12 21.6 13 6.5 2.75 34.0 34.0 48.0 42.6
15 26.6 13 6.5 3.39 35.1 35.1 49.7 43.1
150x150x10 23.0 16 8 2.93 40.3 40.3 57.1 52.5
12 27.3 16 8 3.48 41.2 41.2 58.3 52.9
15 33.8 16 8 4.30 42.5 42.5 60.1 53.3
18 40.1 16 8 5.10 43.7 43.7 61.7 53.7
200x200x16 48.5 18 9 6.18 55.2 55.2 78.1 70.9
18 54.2 18 9 6.91 56.0 56.0 79.3 71.2
20 59.9 18 9 7.63 56.8 56.8 80.4 71.5
24 71.1 18 9 9.06 58.4 58.4 82.6 72.1

Angles (equal leg) dimensions and properties (continued)

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I Ze r J
Designation h*b*t 106mm4 103mm3 mm 103mm4
About x-x and y-y
25x25x3 0.008 0.448 7.49 0.476
5 0.012 0.708 7.30 1.98
30x30x3 0.014 0.649 8.99 0.635
5 0.022 1.04 8.83 2.58
40x40x3 0.035 1.18 12.1 0.882
4 0.045 1.55 12.1 1.92
5 0.054 1.91 12.0 3.56
6 0.063 2.26 11.9 5.92
45x45x3 0.050 1.52 13.7 1.06
4 0.064 1.97 13.6 2.27
5 0.078 2.43 13.5 4.17
50x50x3 0.070 1.89 15.3 1.15
4 0.090 2.46 15.2 2.48
5 0.110 3.05 15.1 4.58
6 0.128 3.61 15.0 7.62
8 0.163 4.68 14.8 17.0
60x60x4 0.158 3.59 18.3 3.07
5 0.194 4.45 18.2 5.64
6 0.228 5.29 18.2 9.36
8 0.292 6.89 18.0 21.0
10 0.349 8.41 17.8 39.2
70x70x6 0.369 7.27 21.3 11.2
8 0.475 9.52 21.1 25.0
10 0.572 11.7 20.9 46.8
80x80x6 0.558 9.57 24.4 13.0
8 0.722 12.6 24.3 29.1
10 0.875 15.4 24.1 54.5
12 1.02 18.2 23.9 91.2
90x90x6 0.803 12.2 27.6 15.0
8 1.04 16.1 27.4 33.3
10 1.27 19.8 27.2 62.4
12 1.48 23.3 27.0 104
100x100x8 1 .45 19.9 30.6 37.6
10 1.77 24.6 30.4 70.3
12 2.07 29.1 30.2 118
15 2.49 35.6 29.8 221
120x120x8 2.55 29.1 36.9 45.4
10 3.13 36.0 36.7 85.1
12 3.68 42.7 36.5 143
15 4.45 52.4 36.2 269
150x150x10 6.24 56.9 46.2 110
12 7.37 67.7 46.0 184
15 8.98 83.5 45.7 347
18 10.5 98.7 45.4 584
200x200x16 23.4 162 61.6 564
18 26.0 181 61.3 790
20 28.5 199 61.1 1070
24 33.3 235 60.6 1800
About u-u
25x25x3 0.013 0.714 9.43 0.476
5 0.019 0.107 9.14 1.98
30x30x3 0.022 1.05 11.3 0.635
5 0.034 1.61 11.1 2.58
40x40x3 0.055 1.93 15.3 0.882
4 0.071 2.51 15.2 1.92
5 0.086 3.04 15.1 3.56
6 0.100 3.53 14.9 5.92
45x45x3 0.079 2.49 17.2 1.06
4 0.102 3.20 17.1 2.27
5 0.124 3.90 17.0 4.17
50x50x3 0.110 3.12 19.2 1.15
4 0.142 4.02 19.1 2.48
5 0.174 4.92 19.0 4.58
6 0.203 5.75 18.9 7.62
8 0.257 7.27 18.6 17.0
60x60x4 0.250 5.90 23.0 3.07
5 0.307 7.24 23.0 5.64
6 0.361 8.52 22.9 9.36
8 0.461 10.9 22.6 21.0
10 0.551 13.0 22.3 39.2
70x70x6 0.585 11.8 26.8 11.2
8 0.753 15.2 26.6 25.0
10 0.905 18.3 26.3 46.8
80x80x6 0.885 15.6 30.8 13.0
8 1.15 20.3 30.6 29.1
10 1.39 24.5 30.3 54.5
12 1.61 28.4 30.0 91.2
90x90x6 1.27 20.0 34.7 15.0
8 1.66 26.0 34.5 33.3
10 2.01 31.6 34.3 62.4
12 2.34 36.8 34.0 104
100x100x8 2.30 32.5 38.5 37.6
10 2.80 39.6 38.3 70.3
12 3.28 46.3 38.0 118
15 3.93 55.5 37.5 221
120x120x8 4.05 47.8 46.5 45.4
10 4.97 58.6 46.3 85.1
12 5.84 68.8 46.0 143
15 7.05 83.1 45.6 269
150x150x10 9.91 93.4 58.2 110
12 11.7 110 58.0 184
15 14.3 134 57.6 347
18 16.6 157 57.1 584
200x200x16 37.2 263 77.6 564
18 41.3 292 77.3 790
20 45.3 320 77.0 1070
24 52.8 374 76.4 1800
About v-v
25x25x3 0.003 0.324 4.83 0.476
5 0.005 0.462 4.80 1.98
30x30x3 0.006 0.496 5.81 0.635
5 0.009 0.706 5.75 2.58
40x40x3 0.014 0.951 7.84 0.882
4 0.019 1.17 7.77 1.92
5 0.023 1.38 7.73 3.56
6 0.027 1.56 7.70 5.92
45x45x3 0.021 1.25 8.88 1.06
4 0.027 1.53 8.76 2.27
5 0.033 1.80 8.71 4.17
50x50x3 0.029 1.58 9.92 1.15
4 0.037 1.94 9.79 2.48
5 0.046 2.29 9.73 4.58
6 0.053 2.61 9.68 7.62
8 0.069 3.19 9.63 17.0
60x60x4 0.066 2.92 11.8 3.07
5 0.080 3.45 11.7 5.64
6 0.094 3.96 11.7 9.36
8 0.122 4.86 11.6 21.0
10 0.148 5.67 11.6 39.2
70x70x6 0.153 5.60 13.7 11.2
8 0.197 6.92 13.6 25.0
10 0.240 8.10 13.5 46.8
80x80x6 0.231 7.55 15.7 13.0
8 0.299 9.37 15.6 29.1
10 0.364 11.0 15.5 54.5
12 0.427 12.5 15.5 91.2
90x90x6 0.333 9.80 17.8 15.0
8 0.431 12.2 17.6 33.3
10 0.526 14.4 17.5 62.4
12 0.617 16.4 17.4 104
100x100x8 0.599 15.5 19.6 37.6
10 0.730 18.3 19.5 70.3
12 0.857 20.9 19.4 118
15 1.04 24.4 19.3 221
120x120x8 1.05 23.1 23.7 45.4
10 1.29 27.5 23.6 85.1
12 1.52 31.6 23.5 143
15 1.85 37.1 23.3 269
150x150x10 2.58 45.1 29.7 110
12 3.03 52.0 29.5 184
15 3.70 61.6 29.3 347
18 4.35 70.5 29.2 584
200x200x16 9.60 123 39.4 564
18 10.7 135 39.3 790
20 11.7 146 39.2 1070
24 13.8 167 39.0 1800
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