Q345B square steel tube

Seamless square and rectangular tubes (Part No. 152-6687-0255) production specifications: Square tubes: 20*20*3mm to 500*500*16mm; Rectangular tubes: 20*30*1.3mm to 400*600*16mm; Greenhouse tubes, galvanized steel pipes, straight seam welded pipes, steel-plastic composite pipes: 1/4", 3/8", 1", 1.25", 1.5", 2", 2.5", 3", 4", 5", 6", 8".