... the total spectrum of producing, trading, stockholding and processing activities in the entire range of Pipes ... of metal. Main Products Type: Product nameSpiral submerged arc welding steel pipeStandardAPI 5L, GB/T9711,GradeQ235,Q345,B ... , and natural gas, construction pipe, ground piling pipeOutside diameter219-2420mmWall thickness5.00-30.00mmLength6-20mTechniqueDouble sides submerged arc welding steel ...