... 10-180mm 2) Thickness:1-20mm 3) Manufacturing standards: GB, DIN, JIS, ASTM 4)Section Shape: Round DingRun Low Carbon Steel ... 5)Ends: Plain ends commonlyGeneral Introduction Jiangyin Dingrun Precision Steel Tube Co. Ltd. (JYDR) is one of ... surface roughness Ra0.4-0.6. The types of steel tubes include 10#, 20#, 35#, 45#, 160Mn, 20GrMo, 35GrMo, ... for Win-Win businesses. DingRun Low Carbon Steel Tube