... /T ASTM 4 MATERIAL :Q195, Q235, Q345 GR.B galvanized steel square tube/pipe1 O.D. 15*15-800*800mm 2 W ... GB3091-2001, ASTM A53, ASTM A106 EN10216,EN10219 Surface treatment galvanized,oiled, painted black or as per customers' request Minimun order ... Manufacturing ,we can offer you best quality square tube(square steel pipe) with competetive price. hope your inquiries, our company can give you ...