... 3) Reprocess: Perforation, painting, cutting hot-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, ... with competitive price and excellent product. Description of Square steel tube:Technique: high frequency weldThickness: 0.5mm --15mmSize ...