What does channel 20# mean?.
Channel steel is a strip of steel with a cross section. Its specifications are X (waist height) (H), leg width (b) X, waist thickness (d) mm number, such as: [200X73X7, indicating waist height of 200 mm, leg width of 73 mm, waist thickness of 7 mm channel, or called 20a# channel. Among them, a means waist high, 200 of the channel has different leg width and waist thickness, so in the right side of the model plus a, B, C to distinguish, such as: 20a#, 20b#, etc..
20# channel steel means that the middle width is 200mm. There are two kinds of specifications: A and B: 20#A:200*73*7, 20#B:200*75*9, sizes indicate middle width * leg width * middle thickness.
Channel steel is divided into ordinary channel steel and light channel steel. Standard Specification for hot-rolled plain channel steel is 5-40#. Specifications for hot rolled flexible channel steel supplied by supply and demand agreement are 6.5-30#. Channel steel is mainly used in building structures, vehicle manufacturing and other industrial structures, and channel steel is often used in conjunction with i-beam.
Channel 20# means: channel No. 20 is channel steel.
