Recently, Yuantai Derun Steel Pipe Manufacturing Group often comes to some customers for on-site inspections at the factory. The farthest place is this American customer, who came from thousands of miles away to the Yuantai steel pipe production workshop. A square tube with a diameter of 500 * 500mm is straight out of the workshop to inspect the factory. Both sides not only achieved win-win cooperation, but also established long-term trust.