Hollow Square Steel Tube /Square Steel Pipe 

square tube W.T.:1.0-12mm Length:2-12m OD:10*10-600*600mm Standard:BS1387 ASTM A53 commodity square steel tube 20*20-600*600mm O.D 20*20-600*600mm W.T 1.2-30mm length 3-12m or according to per request material Q195-Grade B, SS330, SPC, S185 Q215-Grade C,CS Type B, SS330, SPHC Q235---Grade D, SS400, S235JR, S235JO, S235J2 Q345---SS500, ST52, ST37 10#,20#,45#, etc Surface treatment…