Seamless square tube suppliers Tianjin seamless square tube seamless pipe, is four corners of steel pipes, cold drawn seamless steel tubes extruded from square steel pipe, seamless pipe and welded square tube square essentially different. Steel hollow section, a lot of fluids used for pipeline transportation. Note: 1, large supply for your special wall thickness, materials seamless steel tubes, cold drawn precision tubes and a variety of thermal expansion. Square tube Model: Q345A: C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035; Q345B: C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035; Q345C: C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.030, Al≥0.015; Q345D: C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.025, Al≥0.015; Q345E: C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.025, S≤0.020, Al≥0.015; Q345A, B, C, D, E inclusive Nb≤0.07, V≤0.15, Ti≤0.20, Cr ≤0.30, N≤0.012, Mo≤0.10. 20 #, Q235B factory production of precision seamless bright bright color system looks smooth, uniform thickness, no oxide layer, high precision. Seamless inner hole can be divided into round, spline type, plum-type and other widely used in automobiles, motorcycles, hydraulic, petrochemical, shipbuilding, aerospace, bearings, pneumatic components, fuel tanks, boiler equipment, medical equipment, fitness equipment and other industries . Pipe Category: 20 # high precision seamless, precision steel 45 #, GCr15 bearing steel, 20Cr precision steel, 16Mn seamless steel, 40Cr steel and other precision tubing and casing. Non-standard precision tubes can be customized according to user needs.