Shanghai Alison was able to make considerable investments in the introduction of cutting-edge technologies and equipment from the U. S, Germany and other countries in the 1990's for production of OD114-355.6mm high frequency ERW pipe sand one mill for spiral SAW steel pipe of size OD406-1420mmone mill for spiral SAW steel pipe of size OD508-1626mmboth mills can manufactured pipes of Grade up to X80 with wall thickness 6-22mm; The firm has established a thorough quality control system that meets ISO9001-2000 Quality Specifications and the American Petroleum institute of the U. S. (API)Quality Specifications...