... Type: Product nameSpiral submerged arc welding steel pipeStandardAPI 5L, GB/T9711,GradeQ235,Q345,B,X42,X52,X60,X65,X70applicationAs conveyer pipe in the fields ... , and natural gas, construction pipe, ground piling pipeOutside diameter219-2420mmWall thickness5.00-30.00mmLength6-20mTechniqueDouble sides submerged arc welding steel pipeCertificateISO9001:2008, API SPEC ...