1. GB706-88 standard I beam 2. YB/T 5047-2000,EN,DIN standard 3.Length ... SIZEMATERIALSTANDARDLENGTH8#~45#Q235BQ345BGB706-886-12 MI-beam steel is hot rolled from ordinary structural carbon steel, with increased strength.It is suitable ... vehicles, brackets and machinery. As a China profile steel manufacturer, we can produce I-beam steel of various specifications as per customers' requirements.Standard ...