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