... , petroleum exploitation, pipe line, hear-exchanger & boiler, chemical machinery,farm e Main Products:Cold Drawn/ Rolled Seamless ... 17175 Seamless Steel Tubes for Elevated TemperaturesBS3059 Steel Boiler and Super-heater TubesBS6323 Seamless and Welded ... components, petroleum exploitation, pipe line, hear-exchanger & boiler, chemical machinery,farm equipment, ship building, bearing and relative fields. ...