... , petroleum, chemical industry, power, heat power and water source etc.4.I promise you will get the most competitive price from us ... 9711.1-1997, DIN 1626, DIN 1629/3, DIN 1629/4, ASTM A53-2007, ASTM A210-1996, API 5LGrade16Mn, ST35-ST52 ... , Q195-Q345Grade16Mn, St37, St52, St52.4, Q235, Q345Thickness6mm--28mmOuter Diameter219mm - 3500mm API 5L SAW STEEL PIPE