Our produced square and rectangular steel pipes come in full sizes: square pipes from 20*20 to 600*600, rectangular pipes from 20*30 to 400*800, with wall thickness ranging from 1.5mm to 32mm, totaling over 2,800 specifications. Materials include Q355B, Q355C, Q235, S275JOH, S355JOH, Q460, Q550, S275JR, S355JR, S355J2H, ASTM A500 square pipes, British standard square pipes, seamless square pipes, large diameter thick-walled square pipes, and square-rectangular pipes. Custom sizes according to customer-provided drawings and dimensions are also available.