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.

Equal and unequal angle iron

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

Equal leg cold formed angle iron

Cold-formed angles (equal leg) dimensions and properties
Designation hbt	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

Unequal leg cold formed angle iron

Cold-formed angles (unequal leg) dimensions and properties

Designation hbt	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 hbt	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

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