We specialize in 20# Seamless Pipes and Square Tubes, 45# Seamless Pipes and Square Tubes, Q345b Seamless Pipes, Square and Rectangular Tubes, Q345d Seamless Square Pipes, Q235b Rectangular Pipes, 16mn Square Tubes, 16mn Seamless Square Tubes, Stainless Steel Square Tubes, Hot-Dip Galvanized Square Tubes, and other seamless steel pipe products. The specifications and sizes of square and rectangular tubes range from 20*20 to 600*600 for square tubes, and 20*30 to 400*800 for rectangular tubes. Thickness ranges from 0.6mm to 28mm, with over 100 specifications available. Materials include Q235 Square Tubes, Q345 Square Tubes, 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.