Channel steel is a long steel with a grooved cross-section, a carbon structural steel for construction and machinery, and a section steel with a complex cross-section and a grooved shape. Channels are mainly used in building structures, curtain wall works, mechanical equipment and vehicle manufacturing.

Basic conditions

In use, it is required to have good welding and riveting properties and comprehensive mechanical properties. The raw material billet for producing channel steel is carbon knotted steel or low alloy steel billet with carbon content not more than 0.25%. The finished channel steel is delivered in hot-processed, normalized or hot-rolled condition. Its specifications are expressed in millimeters of waist height (h) * leg width (b) * waist thickness (d), such as 100 * 48 * 5.3, indicating a waist height of 100 mm, leg width of 48 mm, waist thickness of 5.3 mm channel steel, or 10 # channel steel. Waist height of the same channel, such as several different leg width and waist thickness also need to be added to the right of the model a b c to distinguish, such as 25 # a 25 # b 25 # c, etc.

Classification

Channels are divided into ordinary channels and light channels. The specifications of hot-rolled common channel are 5-40#. The specifications of hot-rolled variant channels supplied by agreement between supply and demand are 6.5-30#. Channels are mainly used in building structures, vehicle manufacturing, other industrial structures and fixed cabinets, etc. Channels are also often used in conjunction with I-beams.
Channels can be divided into 4 types according to shape: cold-formed equal-sided channels, cold-formed unequal-sided channels, cold-formed inward-rolled channels, cold-formed outward-rolled channels.
According to the theory of steel structure, it should be the flange of the channel to be stressed, that is to say, the channel should be standing, not lying down.

Theoretical weight

Unit: kg/m, mm

Specification	Height	Leg width	Waist thickness	Cross-sectional area （cm²）	Theoretical weight
5#	50	37	4.5	6.928	5.438
6.3#	63	40	4.8	8.451	6.634
6.5#	65	40	4.3		6.709
8#	80	43	5.0	10.248	8.045
10#	100	48	5.3	12.748	10.007
12#	120	53	5.5		12.059
12.6	126	53	5.5	15.692	12.319
14#a	140	58	6.0	18.516	14.535
14#b	140	60	8	21.316	16.733
16#a	160	63	6.5	21.962	17.24
16#b	160	65	8.5	25.162	19.752
18#a	180	68	7	25.699	20.174
18#b	180	70	9	29.299	23
20#a	200	73	7	28.837	22.637
20#b	200	75	9	32.837	25.777
22#a	220	77	7	31.846	24.999
22#b	220	79	9	36.246	28.453
25#a	250	78	7	34.917	27.41
25#b	250	80	9	39.917	31.335
25#c	250	82	11	44.917	35.26
28#a	280	82	7.5	40.034	31.427
28#b	280	84	9.5	45.634	35.832
28#c	280	86	11.5	51.234	40.219
30#a	300	85	7.5		34.463
30#b	300	87	9.5		39.173
30#c	300	89	11.5		43.883
32#a	320	88	8	48.513	38.083
32#b	320	90	10	54.913	43.107
32#c	320	92	12	61.313	48.131
36#a	360	96	9	60.910	47.814
36#b	360	98	11	68.110	53.466
36#c	360	100	13	75.310	59.118
40#a	400	100	10.5	75.068	58.928
40#b	400	102	12.5	83.068	65.208
40#c	400	104	14.5	91.068	71.488