We specialize in 20# seamless pipes and rectangular tubes, 45# seamless pipes and rectangular tubes, Q345b seamless pipes, square and rectangular tubes, Q345d seamless square pipes, Q235b rectangular pipes, 16mn rectangular 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 rectangular tubes: 20*20 to 600*600 square tubes, 20*30 to 400*800 rectangular tubes, thickness: 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 tubes and bright tubes according to customer requirements.