... Spiral steel pipe is from φ219 to φ2850mm and wall thickness is from 5mm to 25mm. the brand ... , GB/T9711.1-1997 and API SPEC 5L, the material can be Q235AB, 16Manganese and X42-X70 grade plate.3 ... gas, petroleum, chemical industry, power, heat power and water source etc.4.I promise you will get ... DIN 1629/4, ASTM A53-2007, ASTM A210-1996, API 5LGrade16Mn, ST35-ST52, Q195-Q345Grade16Mn, St37, St52, St52. ...