We specialize in the production and study of S355/ Q345/ A500/ STKR490 welded steel pipe and seamless pipe, Square steel pipe, rectangular steel pipe, straight seam welded steel pipe, spiral welded pipe, we can supply the following specifications, standards, material steel:
Square steel tube: 30 * 30-800 * 800mm ,wall thickness :3.0-30mm, 
rectangular steel tube: 50 * 30-800 * 300 ,wall thickness :3.0-30mm
ERW Pipe: Φ48-1420mm ,wall thickness :2.5-60mm
seamless steel pipe: Φ60-1020mm, wall thickness 3.0-60mm
EN10210 \ EN10219: S235JRH \ S275 \ S275J2H \ S355JOH \ S355J2
ASTM A500: A \ B \ C \ D
JIS G3466 STKR: 400 \ 490
GB/T6728-2002 \ GB/T3094-2012: Q235B \ Q345B \ Q345D