... 10219Q195,Q215,Q235,Q345GR.A, GR.B, GR.CSt37,st52S235J2H,S355J2H20*20-400*400mmX 1.0mm-16mmRectangular steel tube30*20-500*300mmX 1.0mm ... 65ASTM A53EN 10240 GB/T 3091Q195,Q215,Q235,Q345GR.A, GR.B, GR.CSt37,st52S235J2H,S355J2H1/2’’-8’’X 1.0mm-12.7mmSquare ... .75 400*4006.0-12.75120*802.0-4.75 Carbon square steel pipe