"Z-shaped steel" refers to corrugated web H-beam steel. Open Steel Structures has collaborated with Tongji University since 2008, conducting over two years of experimental research and completing 48 different tests to develop several specific waveforms suitable for structural use. Together, they compiled the "Technical Regulations for Corrugated Web H-beam Steel" (CECS291:2011). These waveforms have been practically applied in nearly 30 projects, covering over 300,000 square meters, filling the domestic gap in the research and standard application of corrugated web products. Z-shaped steel's primary engineering applications are largely similar to those of flat web plates, and are mainly suitable for: 1) Portal frame roof beams 2) Crane beams with a lifting capacity of up to 50 tons 3) Secondary beams for mezzanine floors 4) Wind-resistant columns Due to equipment capacity, the height of Z-shaped steel components does not exceed 1500mm, and the maximum thickness of the web is 6mm.