... welded steel pipe Outside diameter: 21.3 to 610mm (1/2-24 inch) ch) Standard: API 5L,API 5CT, ASTM A53, ASTM longitudinal welded steel pipeERW Steel Pipeeel Pipe ... Steel Pipe Standard: API 5L, API 5CT, ASTM A53, ASTM A2STM A53, ASTM A252, ASTM A500STM A500, BS1387 ERW Steel Pipe Grade: A, RW Steel Pipe Grade: A ... to produce qualified steel p steel pipleel piplified steel pipes of Q235,Q345 and X42-× ...