The product is double-faced submerged-arc welded pipes. The diameter of our is from φ219 to φ3000mm and wall thickness is from 5mm to 24mm. Standard: API SPEC 5L, GB/T9711.1-1997 Material: Q235AB , X42---X70 grade plate We also have a good business relationship with suppliers of elbow, flange, anti-corrosive painting etc. and we have a professional team which is experienced in fabricating the piping line.