... Reprocess: Perforation, painting, cutting. MS ERW black rectangular steel 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( ... B, ASTM.A53,10#,20#,30#.ETC.Standard: GB3091-2001,GB/T 9711.2, ASTM A53, ASTM A106 EN10216,EN10219, ETC ...