This is Hot Rolled Steel in H or I shaped. These are also known as I beam or Universal Beam and H Beam or Universal Column. These are basically used as support members in fabrication and erection of steel structures. They are weldable and have good mechanical properties for the intended use.
I - BEAM : It is represented by dimensions of Web & Flange. For e.g. 150x75 beam means,Width of Web = 150mm, Width of Flange = 75mm
H - BEAM : In H-Beam generally the sizes of the Web & Flange are almost equal. When we say, 254 x 254 beam means Web = 254mm & Flange = 254mm.