hollow structural steel pipe 1.Steel grade:St37-2, St52-3, ... Q195, Q235, 2.Specification:10*10-600*600mm 3.Length:5.8-12m hollow ... strips.7.We can supply seamless square and rectangular pipe as requested8.Usage:used for machinery, processing , ... automobile manufacturing, shipbuilding, electric power.9.Specification:SQUARE STEEL PIPE L1 (mm)L2 (mm)Thickness (mm)L1 (mm ...