... pipeCommodityRectangular steel pipeStandardsGB/T 6728-2002 GB3091MaterialQ195 Q235Specification20*30-100*150mmWall Thickness0.5-4.5mmLength6m or as ... steel pipes and tubes are used in different industrial applications. The common areas, where these rectangular ... fabrication, auto fabrication, motor cycles, doors and windows, industrial plant structure, bicycles, furniture etc. There are several ...