Black Steel I BeamThis is a Black Steel A992 11 8'' x 4 x 18. 4# x 40' S Beam. The "#" of the Beam means the Weight Per Foot in Pounds. When multiplied by the length, it will give you the total weight of the channel. I Beams, also known as H Beams have and I or H cross section. The horizontal elements of the I are flanges while the vertical element is the web. I Beams are commonly made of structural steel but can be formed out of aluminum. I beams are most widely used