ISMB - Indian Standard Medium Weight Beam. This weight chart is republished here. It has been a popular post of this blog. However it is necessary to update the table for more information like dimensions of Web and Flange including thickness apart from unit weight.
Beam cross section looks like a English letter I or H. It is a Hot rolled Steel, The horizontal element is called flanges, while the vertical element is called web and it is a Hot rolled steel
For More Details about classification of Hot rolled steel click Here
For More Details about the unit weight of all beam click All in One