square steel tube 1)Standards/grade: Q195/235/345,ST37/52 2)Size: OD 10 x 10-600 x 600mm thickness 0.8-50mm square steel tube1)Standards/grade: Q195/235/345,ST37/52,A53B, A179B, 20G, A106B, Din2391 17 Cr3, ST37, ST52, STK4002)Size: OD 10 x 10-600 x 600mm thickness 0.8-50mm3)Packing by bulk or in bundle4)Original Tianjin/Hebei Provice