ANGLE IRONS


Cold Formed Equal and Unequal Leg


Mild steel angle irons are formed by one of two different methods. Angle irons can either be hot-formed or cold-formed. Both hot and cold formed angle irons can be equal or unequal flanged. The visual difference between hot and cold formed angle irons are shown in the picture below while the table below the picture explains these differences.

 cold_formed_vs_hot_formed_angle_irons.jpg

Nr Cold formed Quality Hot formed Quality
1 Slit material Edges Rounded Edges
2 Equal Thickness Tapered Legs
3 Rounded Outside Corner Square Outside Corner

The cold formed angle iron offers the customer a significant advantage if a need for value adding such as in-line hole punching on cold formed angle irons are done when the slitted material is still in a flat state (not formed yet). Hot formed angle irons have to be punched off-line which may incur additional cost or the possibility may exist that it will not be possible. The flatness and consistent thickness given by the cold formed angle irons holds advantages during fabrication which cannot be achieved with the tapered legs from the hot formed angle iron.

Another advantage that cold formed products have over hot formed products is the fact that there is less scale on the product, making it easier to paint or coat leading to a more aesthetically pleasing end product.

Tubecon manufactures cold formed angle irons at its manufacturing plant in Pretoria. Punching and rolling/cutting to size is offered by Tubecon as well.

Angle irons are used for rails, posts, supports, hangers, flanges, brackets, gate and fence structures to name only a few.

Cold Formed Equal Leg Angles

cold_formed_angels_equal_leg_.png

Cold-formed angles (equal leg) dimensions and properties
Designation
h*b*t
m A ax ay I Ze r rv
mm  kg/m       10^3mm^2       mm       mm      10^6mm^4     10^3mm^3     mm      mm   
                      About x-x and y-y  
25x25x1.6  0.59  0.075  7.0  7.0  0.005  0.258  7.85  4.76
2.0  0.73  0.093  7.2  7.2  0.006  0.316  7.79  4.66
2.5  0.89  0.113  7.5  7.5  0.007  0.385  7.71  4.52
3.0  1.05  0.133  7.8  7.8  0.008  0.449  7.62  4.37
30x30x1.6  0.72  0.091  8.3  8.3  0.008  0.376  9.46  5.79
2.0  0.88  0.113  8.5  8.5  0.010  0.463  9.41  5.70
2.5  1.09  0.138  8.7  8.7  0.012  0.567  9.33  5.57
3.0  1.28  0.163  9.0  9.0  0.014  0.665  9.25  5.43
40x40x1.6  0.97  0.123  10.8  10.8  0.020  0.680  12.7  7.84
2.0  1.20  0.153  11.0  11.0  0.024  0.840  12.6  7.75
2.5  1.48  0.188  11.2  11.2  0.030  1.03  12.6  7.63
3.0  1.75  0.223  11.5  11.5  0.035  1.22  12.5  7.51
50x50x2.0  1.51  0.193  13.5  13.5  0.048  1.33  15.9  9.80
2.5  1.87  0.238  13.7  13.7  0.059  1.64  15.8  9.69
3.0  2.22  0.283  14.0  14.0  0.070  1.94  15.7  9.57
3.5  2.57  0.327  14.2  14.2  0.080  2.24  15.6  9.45
rv = minimum radius of gyration

Cold Formed Unequal Leg Angles

cold_formed_angels_unequal_leg_.png

Cold-formed angles (unequal leg) dimensions and properties

Designation 
h*b*t
m A ax ay rv
mm kg/m 10^3mm^2 mm mm mm
50x25x2.0 1.12 0.143 17.9 5.05 5.37
2.5 1.38 0.176 18.2 5.28 5.28
3.0 1.63 0.208 18.5 5.50 5.19
75x50x2.5 2.23 0.301 23.9 11.1 10.9
3.0 4.12 0.358 24.1 11.4 10.8
3.5 3.26 0.415 24.4 11.6 10.7
4.5 4.12 0.525 25.0 12.1 10.5
100x50x3 3.40 0.4333 35.1 9.66 10.9
3.5 3.94 0.502 35.4 9.88 10.8
4.5 5.00 0.637 36.0 10.3 10.6
100x75x3.0 3.99 0.508 30.1 17.5 16.3
3.5 4.63 0.590 30.4 17.7 16.2
4.5 5.89 0.750 30.9 18.2 16.0

rv=minimum radius of gyration

Cold formed angles (unequal leg) dimensions and properties (continued)

Designation
h*b*t
l Ze r l Ze r
mm 10^6mm^4 10^3mm^3 mm 10^6mm^4 10^3mm^3 mm
50x25x2.0 0.038 1.18 16.3 0.007 0.346 6.96
2.5 0.046 1.45 16.2 0.008 0.424 6.90
3.0 0.054 1.72 16.1 0.010 0.500 6.84
75x50x2.5 0.181 3.53 24.5 0.067 1.73 14.9
3.0 0.214 4.20 24.4 0.079 2.05 14.9
3.5 0.246 4.86 24.3 0.091 2.37 14.8
4.5 0.307 6.13 24.2 0.113 2.99 14.7
100x50x3.0 0.467 7.19 32.8 0.085 2.12 14.0
3.5 0.538 8.33 32.7 0.098 2.45 14.0
4.5 0.675 10.5 32.5 0.122 3.09 13.9
100x75x3.0 0.539 7.71 32.6 0.268 4.66 23.0
3.5 0.622 8.94 32.5 0.309 5.39 22.9
4.5 0.784 11.4 32.3 0.389 6.84 22.8