I-beam, also known as steel beam, is a long strip of steel with an I-shaped cross-section. I-beam is divided into ordinary I-beam and light I-beam. It is a section steel with an I-shaped cross-section. I-beams are mainly divided into ordinary I-beams, light I-beams, and wide flange I-beams. According to the height ratio of the flange to the web, it is further divided into wide, medium, and narrow width flange I-beams.