Oil Line Pipes 1.Standard:BS, GB, DIN, ASTM, API 2 ... St42, Q.. 3.Outer Diameter:8-24mm Oil Line Pipes Spiral Seam double-side submerged arc welded steel pipe1. Standard: BS, GB, DIN ... , South-east Asia, USA, Canada, South America. Technique SAW welding Usage1. Piling project2. heat-supply project 3. conveying water, coal ... Oil tube 7. hot-galvanized steel pipe Ssaw Oil Line Pipes (L415, L320, L450)