... 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, ... ASTM A53, ASTM A106 EN10216,EN10219, ETC.Surface treatment: galvanized, oil, painted black as customer’s requirement.Packing: bundles ...