We specialize in 20# seamless pipes and rectangular tubes, 45# seamless pipes and rectangular tubes, Q345b seamless pipes and square tubes, Q345d seamless square pipes, Q235b rectangular pipes, 16mn square pipes, 16mn seamless square pipes, stainless steel square pipes, and galvanized square pipes, among other seamless steel pipe products. The specifications of the square and rectangular tubes range from 20*20 to 600*600 for squares and 20*30 to 400*800 for rectangles, with thicknesses from 0.6mm to 28mm, and over 100 sizes available. Materials include Q235 square pipes, Q345 square pipes, 20#, 45#, seamless pipes, and alloy steel. Our company has 5 precision rolling production lines and can custom make various seamless precision pipes and bright pipes according to customer requirements.