API spiral pipe 1.Certificate:ISO,API 2.Delivery time:20 days ... :technique,price and high quality 4.OD:219-2500mm API spiral pipeMaterials: Gr.B x42, x46, x52, x56, x65, Q245, and ... Q345B Process method: spiral welded Surface finish: black painted , varnished or 3PE coating Size ... , steel structure buildings, steel structure bridges, seaports, and docks API spiral pipe