... 3.Length:5.8-12m hollow structural steel pipe1.Steel standard: DIN EN 10210, DIN EN 10219 ... , ASTM A500, GB/T3094-2000, GB/T6728-2002, GB/T178-2005, JIS G ... 3466.2.Steel grade:St37-2, St52-3, Q195, Q235 ... automobile manufacturing, shipbuilding, electric power.9.Specification:SQUARE STEEL PIPE L1 (mm)L2 (mm)Thickness (mm)L1 ...