cold-rolled square tube/pipe. 1) Dimensions: 20x20mm-300x300mm 2)WT: 0.6-25mm 3) Reprocess: Perforation, painting, cutting cold-rolled square tube/pipe. As the profeesional steel pipes and pipe fittings manufacture in China,we cansupply straight seam steel pipe,spiral steel pipe,seamless steel pipe,elbow, bend,end cap,flange,tee,reducer(concentric and eccentric) and high pressure pipe with ...