... steel pipe 1)Dimensions:15x15mm-400x400mm(1/2"x1/2"-16"x16") 2)Length:0.305-12m(1-40ft) 3 ... square steel pipeDimeter15*15mm-400*400mm(1/2"*1/2"-16"*16")Thickness0.6-20mmLength0.305-12m(1-40ft) ... Steel gradeQ195,Q215,Q235,Q345,Fe360,St37-2,SS330SS400, ... paperAddition1)steel grade :Q195,Q215 Q235 Fe360, St37-2, SS330, SS400,ASTM 1010, ASTM 1017, ASTM ...