ST52 / S355JR / E355 Honed Steel Tubing , Precision Steel ST52 / S355JR / E355 Precision Steel Tube, Honing Pipe and Skiving Pipe for Hydraulic Cylinder, OD:30-500mm; WT:2-50mm, Small MOQ. EN 10297-1 Grade E355 Carbon Steel Seamless Tubes are also known as mild steel pipes and tubes. EN 1029